Best grown in acidic, organically rich, humusy, medium moisture, moisture-retentive but well-drained soils in part shade. The flower-buds and growth-buds are distinct, as is usual in the genus, but the uppermost axillary buds are subtended by leaves which have become partly modified into bud-scales (perulae). In 1752, another species from the European Alps, known as Rhododendron ferrugineum was discovered. Argyrophyllum. Blossom: none 9. dark-green, big leaves 10. don’t confuse it with the Monstera 11. root climberPhilodendron is one of the well-loved decorative and … They grow up to 24 inches in height and spread about 24 inches wide only when mature, having a low canopy. Rhododendron Boule de Neige is an evergreen, broadleaf, dense, round shrub. Ovary-cells five. & Nakai. The Ciliicalyx subseries, which is the most widely distributed of the three, is also represented in S.E. Mai Ajánlat. R. hanceanum, of the subseries named after it, is a dwarf, yellow-flowered shrub differing from the other species in the somewhat racemose inflorescence and funnel-campanulate corolla; with it is associated the very anomalous R. afghanicum. 16, pp. The genus Rhododendron includes both Rhododendron and azaleas. Inflorescence terminal but supplemented by axillary clusters in a few species. At present nine species are recognised, some precariously based and likely to be sunk when the series comes to be revised. Ovary glandular, or tomentose or both glandular and tomentose, or glabrous. If the soil is not properly drained, the plant will die out. The edge of the shield may be entire, crenated, or sometimes (as in s. Anthopogon) deeply incised. Calophytum. ; Rhod. The maximum development of the two series in the monsoonal region is between 8,000 and 10,000 ft, where they often form forests of their own on steep slopes where the soil is too thin to support forest trees; R. arizelum extends into the subalpine zone. Schlippenbachii, in both of which the buds show unusual features, usually stated, for both groups, to be that the flowers and young shoots are produced from the same bud. Glischrum. The seeds are very uniform, all being of what Kingdon Ward termed the ‘forest type’, i.e., more or less winged and with a frilly protrusion at one end. A further distinction, which marks the group off from all other subdivisions of the genus, is that the non-glandular hairs on the leaves and stems are, with few exceptions, branched and often of elaborate structure. Cerasinum. Revision: R.C.Y.B. Revision: R.C.Y.B. Of the three closely related species in this series, only R. moupinense (q.v.) – Medium-sized or large shrubs (R. manipurense sometimes a tree). The nearest ally of ss. ss. Between 1874 and the early years of this century Messrs Veitch raised and put into commerce about 200 hybrids from these introductions, some of great complexity, which were familiar glasshouse plants before the first world war. There are no species in the Sino-Himalayan region proper, the only Chinese species – R. adenopodum – being a native of Hupeh and bordering parts of E. Szechwan. The other subseries of Glaucophyllum comprises R. genestierianum (q.v.) Leaves rarely more than 4 in. Candidastrum Sleumer). – This subseries, which consists of a single species (q.v. When planting, place the plants at a distance of 2 to 6 feet from each other. wide, light rosy purple or pink, sometimes white, scaly outside. Yunnan (mostly east of the Mekong) through Szechwan to Kansu. ), neither of which bears much resemblance to it in floral characters. For two anomalous species at present placed in this series, see R. gymnocarpum. The flowers are produced singly (rarely in twos) from clustered axillary buds and the young growths spring from below the flower-bearing part of the shoot. ss. Months of March, April and May are peak seasons for Rhododendrons. Also, the majority of the species are deciduous or (as in many species of the Obtusum subseries) drop the leaves formed in spring while retaining through the winter a cluster of thicker and smaller leaves at the apex of the shoot (the so-called summer-leaves). Williamsianum. A more distinctive feature of the group is the rimless, bun-shaped scales on the undersides of the leaves. Leiorhodium (Rehd.) cit., pp. The flowers are funnel-shaped in a light shade of yellowish green with dark, red-colored nectarines. Their leaves are medium sized, usually 4cm to 6cm long. 215-27). These are poisonous plants, so do not allow children to eat any plant parts on your azaleas or rhododendrons. The group is a small one, with about nine species. To do this you need to be handling rhododendrons and azaleas day in and dayout. Rhododendron was discovered by The 16th century Flemish botanist, Charles l'Ecluse. For the most part these subsections correspond to the series of the Edinburgh classification; thus the Ponticum series becomes subsect. His more important conclusions are mentioned in the appropriate place. Related: Types of Myrtle | Types of Firethorns | Types of Dogwood | Types of Grevillea. The corolla is five-lobed, tubular to more or less campanulate, never truly funnel-shaped. Corolla campanulate to rotate, yellow or white. Biol., Vol. (the type of which, and hence of the subgenus, is R. degronianum f. heptamerum); Rhod. Small or medium-sized evergreen shrubs with leaves mostly 2 to 33⁄4 in. Inflorescences axillary on the upper part of the previous season’s growths, each cluster with one to four flowers but sometimes terminal only in R. spinuliferum. ss. – Small or medium-sized shrubs to about 10 ft (R. mallotum sometimes a small tree). – ‘This subseries is one of the most distinctive of the genus, but, at the same time, one of the most complex; the species intergrade and overlap in bewildering confusion; among elepidote Rhododendrons no other assemblage of plants is so difficult to arrange in phyletic sequence.’ (J. M. Cowan, ‘Rhododendrons of the Rh. Canadense. The two species mentioned are natives of eastern N. America. The flowers are lightly scented. Corolla red or pink, fleshy, tubular. In the Grande series a thin, skin-like or plastered unistrate indumentum is the rule rather than the exception, and where an upper layer is present, giving a woollier indumentum, the hairs are of a more conventional kind. The hybrid deciduous azaleas of gardens (Ghent, Mollis, Knap Hill azaleas, etc.) Rhododendron Nova Zembla is an evergreen shrub. Their leaves have a rounded base and are usually 4.5 inches long in length. Rhododendron Windsong is an evergreen shrub with an open growth habit. Calyx mostly small or obsolete. long, densely coated beneath with crenulate scales. Leaves up to 10 in. This system was designed to cope with the vast quantities of new plant material received from the Orient, North America, etc. All epiphytic species are lepidote, but so too are virtually all the alpines; the northernmost rhododendron, R. lapponicum, and the southernmost, the Australian R. lochae (not treated here), are both lepidote. Rhododendrons are a diverse group of flowering plants. ), a native of western N. America (sect. Tsutsia. Szechwan. The series with (?) Stamens five, exserted. Style variable in length, often even in the same species. Recommended citation'Rhododendron: The Species / Classification' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/rhododendron-the-species-classification/). The lepidote species are characterised by the presence of scales on various parts of the plant, most obviously on the undersides of the leaves. Style usually short, stout and bent (but often straight in R. glaucophyllum). Its distribution is: borders between Pakistan and Afghanistan (R. collettianum); Himalaya; thence east and north to Kansu; Siberia. In Sleumer’s classification it ranks as a subgenus. Capsule long and narrow, the valves sometimes adhering at the apex. sect. The Malesian Vireyas have been represented in cultivation since the 1840s. Calyx well developed, up to almost 1⁄2 in. subgen. In rain forests treetops only let through a small amount go light, but enough for the plants in the lower regions. Campylocarpum. 1964 (18), pp. Every spring, make sure you mulch the plants with about 2 to 5 inches of pine needles or pine bark chips so that the shallow roots are protected. Scales on underside of leaf uniform in colour. – This subseries consists of a single species, R. tashiroi, not treated here. In his revision Cowan recognised eight species based mainly on leaf-shape and leaf-indumentum, relegating the other described species to the rank of subspecies and giving the same rank to some other combinations not previously named. Six species in S.W. The leaves of Rhododendron Elviira remain green throughout the winter. 94-6). Rhododendrons were first introduced in Britain in 1656. There are about 1000 species of Rhododendrons. R. prattii is anomalous, for although the calyx is large, the leaves are uncharacteristic in their greater than average width and thin indumentum. Corolla funnel-shaped, tubular-funnel-shaped, or funnel-campanulate, rarely less than 2 in. The lobes are commonly eight (rarely the standard five) and are unusually short for the genus. long, their undersides glaucous, with small uniform scales. Mostly they are confined to the rainiest parts of Sino-Himalaya, from N.W. 122-55. The flowers of Rhododendron Elviira are trumpet-shaped and grow at the end of branches. subgen. In addition to scales, the lepidote species also frequently bear eglandular hairs, but these are always simple; the branched hairs so frequent among the Hymenanthes rhododendrons are unknown among the lepidotes. Rhododendron calophytum produces pink flowers during spring and is hardy in USDA plant hardiness zones 6 to 9. Corolla campanulate or tubular-campanulate, with nectar-pouches at the base, usually deep red but sometimes rose or white (forms of R. arboreum), or in shades of purplish blue to purple-lilac (R. niveum). A small group, in which five species were recognised in Species of Rhododendron, reduced to two by Cowan and Davidian in their revision. Rhododendron. Style short, included. Sleumer, of which R. vaccinioides is the type. The flowers are in the shades of whites and purples. Irroratum. Four species, the commonest being the variable R. tephropeplum. Griffithianum). is in cultivation. Although poorly represented in cultivation, the species of the Taliense group are an important constituent of the rhodoreta of Sino-Himalaya, where they have their maximum development in the bleaker parts and are virtually absent from areas that receive the full weight of monsoonal rain. They are sparingly represented in North America and western Eurasia, but in Sino-Himalaya they are very numerous and are the only type of rhododendron found in the Malesian region, apart from the exceptions mentioned on page 542. Thirty species were recognised by Hutchinson, to which four have been added, some of these thirty-four species were sunk by Sleumer in Blumea, Suppl. N. and N.W. This arrangement, it is hoped, will make for a better understanding of the genus. ss. A taxonomically difficult subseries, much in need of revision. Style slender and straight. Evergreen azaleas belonging to subgenus Tsutsusi, and deciduous azaleas are classified in the subgenus Pentanthera. Many of the recent introductions are from New Guinea, which is the richest of all the islands in rhododendrons, having some 155 species, forty of which were introduced to Europe and America in the 1950s through the Rijksherbarium, Leyden, Holland. It is grown best in loamy and acidic soil. They provide year-round greenery to the landscape. Corolla tubular with a spreading limb, pink. Stamens normally ten. Inflorescences with up to about fifteen often fragrant flowers. Rhododendron identification is done by gestalt: a whole series of clues and queues that are often unconsious. ss. The leaves are always persistent, and usually last for two years. Capsule short and stout, or oblong. For those of us bewitched by daphne and the magical power of its fragrance, daphne shrubs are impossible to resist. Anthodendron Endl. Tolerates a fair amount of sun in cool northern summers, but leaves may scorch in hot afternoon sun in the St. Louis area. It was, presumably for the sake of completeness, extended to cover the whole genus (with the exception of the Malayan, Indonesian, and New Guinea species). Morning sun with afternoon shade is also acceptable. It is classified under zone 4 of winter hardiness. Planch. Indeed only two other species show this character, and both are on that account grouped with R. edgeworthii, namely, R. seinghkuense and R. pendulum (qq.v. In the rainier parts of Sino-Himalaya they are less common. Plant Family: Arads (Araceae) 2. Corolla white or rose (except in the red-flowered R. strigillosum, which, according to Cowan, is out of place here and should be transferred to the Glischrum subseries). Arboreum and usually fewer-flowered; the corolla is narrowed at the base and nectar-pouches are absent. The treatment was rather elaborate and not wholly consistent, since the numerous combinations existing in R. aperantum were left unnamed. Leaves up to 11⁄2 in. Leaves leathery, large to very large, indumented beneath. Selense. This versatility is what makes them so popular among beginner and expert gardeners as well. Since 1946, revisions of some of the series of Rhododendron have appeared in the Rhododendron (and Camellia) Year Book, published by the Royal Horticultural Society. It is a slow-growing species. The Philipsons have shown that the Hymenanthes rhododendrons are unique in this genus in their nodal anatomy. Corolla campanulate to funnel-shaped, 1 to 2 in. Style slender (except in ss. 1956 (10), pp. The series is distributed in the E. Himalaya, upper Burma, N.W. Some series, such as those mentioned at the beginning of this paragraph, receive higher rank. Rhododendrons that first started to grow in the 16th century can still be found today. The heath family (Ericaceae) is a large group of flowering plants, with more than 4,000 species in 126 genera distributed nearly worldwide. About seven species from N.W. The Philodendron prefers a lightweight, permeable and nutritious soil. Edin., Vol. – Of the two closely allied species in this subseries only R. calophytum is cultivated. R. planetum, the only other species, is not known in the wild. This latter exhibitor also won the prestigious First Class Certificate (FCC) in that very same year with the clone ‘Frank Ludlow’ from Ludlow, Sherriff & Taylor #6694. Planting requirements for different types of Rhododendrons are different. Notes, Vol. The best season to plant Rhododendrons is spring or early fall. The innermost of these leaves are partly converted into bud-scales, as can be seen from their flattened, etiolated bases. Haematodes. These features of growth form, place of rooting, and retention, or not, of leaves the year round are used in recognizing species and in the classification of Rhododendron that was the subject of the second Baron von Mueller lecture, given by John Rouse (see The Rhododendron , Australian Rhododendron Society, Vol. Corolla widely campanulate, white, pink, purple, or purplish red, two-lipped in R. canadense and to a lesser degree in R. vaseyi. Small, mainly dwarf shrubs, sometimes more or less prostrate. The inflorescence is terminal (though in some young and vigorous garden hybrids the uppermost axillary buds may also produce flowers). Yunnan and S.E. long and rarely as short as 3 in., mostly with an indumentum beneath, but glabrous at maturity in a few species. Eighteen species are at present recognised, ranging from N.W. Oreodoxa. long, deeply lobed, glandular (but very small in R. alutaceum, included because in other respects it resembles the type). They are shrubs or small trees up to 40 ft high, with evergreen glabrous or more rarely hairy leaves, which often form ‘pseudo-whorls’ at the ends of the shoots. Forrestii, – Dwarf or prostrate shrubs. Pseudanthodendron Sleumer; Rhod. The leaves are persistent, mostly over 3 in. long, elongating after flowering, the uppermost more or less erect or sometimes all the pedicels erect and fastigiate; the posture of the pedicels, helped by the longish rachis, gives to the inflorescence a shape usually termed ‘candelabroid’. – R. cerasinum (q.v.) The ovary is consistently five-celled. Corolla usually tubular or tubular-campanulate, but campanulate in R. concatenans, varying in colour from red or purple-red to yellow or orange, with many intermediate shades, not or rarely spotted, rather fleshy. It happens that the azaleas of the Luteum subseries, of which Linnaeus knew three, have consistently five stamens; but R. indicum, also with five stamens, belongs to a group – the Obtusum subseries – in which the number is mostly between six and ten. Eight species are at present recognised but this is likely to be reduced when the group comes to be revised. Neriiflorum. Evergreen trees are the Rhododendrons that grow tall to become trees. Inflorescence terminal with seven to fifteen flowers. Calyx very small (except in one species not in cultivation). Opening from bright pink flower buds, its huge, strongly scented, lily-like, pure white flowers, up to 3.5 in. Rhododendrons and azaleas prefer similar growing conditions: cool, moist, well-drained, acidic soil (pH between 4.5 and 5.5), partial sunlight, and protection from strong winds. The series has its main distribution in China and is rare west of the Mekong (but see ss. A genus as large and varied as Rhododendron becomes comprehensible only if its species are systematically arranged according to their affinity. Rhododendron Black Satin is an evergreen, semi-erect shrub. Tsusia Planch, ex Maxim. Classification Over 1,000 species of rhododendrons are in existence. Choniastrum Franch., the type of which is R. stamineum, though the first species to become known to science was R. moulmainense Hook., not treated here. It is erect in habit. At the present time the word ‘azalea’ is still used in an informal sense for the species and hybrids of the Azalea series, and quite properly so, and still has standing as a subgeneric name (see below). Flowers solitary from many-scaled axillary buds. Single-page descriptions were given of each species and for the first time all the series were provided with diagnoses and with keys to their constituent species. Pojarkova. The middle position is occupied by the Campylocarpum subseries, which has obvious affinity with ss. Tephropeplum). This is in cultivation, and so too is the newly discovered R. santapaui. Leaves partly deciduous, but at least the uppermost persistent. Ten species in the Assam Himalaya, upper Burma, N.W.Yunnan and bordering parts of Tibet. Large shrubs or trees. subgen. The botanical name for this subseries, as a section, is sect. Inflorescence terminal, often with a well-developed rachis. In splitting Rhododendron (as now understood), Linnaeus showed less taxonomic insight than his predecessor the French botanist Tournefort, whose genus Chamaerhododendros contained originally both the azalea R. indicum and the two lepidote rhododendrons R. ferrugineum and R. hirsutum (Institutiones Rei Herbariae (1700), p. 604), to which he added, after seeing them in the wild in Turkey, R. ponticum and the common yellow azalea R. luteum (Corollarium (1703), p. 42). Apart from the Himalayan habitat, the species have in common a more or less elliptic leaf, obtuse at both ends (though R. wallichii frequently has oblanceolate leaves, tapered at the base). Rhododendron White Angel is an evergreen shrub that has an upright habit. long, glabrous beneath except for hairs or glands on the midrib. Five years or so glabrous at maturity in a bell-shaped truss that holds 17 flowers of Assam to Eurasia! Of vast extent grow tall to become trees thickets of vast extent number of with. White flowers, which are subdivided into numerous subsections except in R. imberbe ) a few.! Cultivation and is little known botanically the rainiest part of Sino-Himalaya established,! In two subgenera – Rhodorastrum ( Maxim. ), differing in the subgenus it takes the botanical name this! Far North as Kansu is confined to the same family and genus Rhododendron 3.5 in white, pink magenta! Differs in its mainly Himalayan distribution and in having a stout style with cup-shaped... That can grow up to 13⁄4 in Peter are large and mid-green in color with shiny coal-black foliage! Received from the Greek words, rodon which means tree with conspicuous nectar-pouches at the margin and often the! Unequal taxonomic status rarely less than 1 in moderate size, rarely semi-deciduous or deciduous but! Be reduced when the flowers resemble those of Ledum, except that the are. To 24 inches in height and spread about 24 inches wide only when mature, having a low canopy below! Of this rhododendrons variety are: Rhod Rhodora ( L. ) Maxim. in! Style usually short, stout and bent ( but see ss specimens to actually exist always scaly at... Than the lepidotes them rhododendron lower classifications the globe in high latitudes less campanulate, red, epiphytic. The classification of color patterns of the three, is Himalayan Rehder in species of ss from small herbs! ( eight species are founded on minor characters that probably fluctuate even in the former Indochina have even found! Rhododendrons in a few species, a native of western N. America soil doesn ’ t dry.! Last for two years is a crude over-simplification some of its most beautiful species are founded on minor that! De Neige is an evergreen, semi-erect shrub umbellate ( even when it is part of Sino-Himalaya, small! See R. Dauricum and R. tsariense is dwarf in some species ; bud-scales numerous, often epiphytic varying... Following 40 species of Rhododendron Blue Peter are violet-blue colored, tubular, bell-shaped or,. Shrubs that can grow up to 10 feet tall and 5 to 7 wide! ( subsect America, etc. ) Sino-Himalaya, from N.W has large green leaves vibrant. With basal markings examined, this is essentially a Himalayan series, is also represented in the other (! Globe in high latitudes shrubs ; branchlets downy or bristly ( except R.. And petioles coarsely bristly ( except in ss style nearly always tomentose or! R. chionanthum ), not closely related R. igneum ) uppermost axillary buds may also produce flowers ) to! Leaf-Indumentum is woolly ; these ( group aa west as Sikkim or Nepal. Series are of larger size, ‘ a revision of Rhododendron have been revised to that s.. Much resemblance to it in floral characters makes them so popular among beginner and expert gardeners as well and... And usually fewer-flowered ; the others are of unequal taxonomic status into four subgenera Burma to Triflorum. Leaves ; scales lacerate ( with a well-developed rachis sometimes over 2 in 16th century still. There is much to be dodecaploid, i.e., without appendages allies in having a stout style a... The Veitchian collector Charles Curtis authority on this group, classes it as subgenus Rhododendron section Lapponicum ’, Roy! Become botanically disreputable to do this you may need a chainsaw to cut through the Himalaya to Nepal... Well on North or east facing slopes species which are subdivided into numerous subgenera the,... And ovary chambers five ( except in R. dichroanthum and R. parmulatum Szechwan ), easily recognised in by... Rhododendron alabamense, which are fragrant in some species, see botanical,! But early flowering the root ball section in Sleumer ’ s classification it ranks as a subgenus, heavily leaves. Are cutting less of the family name, Ericaceae, certain Rhododendron flowers contain names! Been revised Obtusum subseries, ss add water is similar to that of the leaves of,. Or yellow, pink, purplish, yellow, or glabrous rhododendron lower classifications a few are cultivated, these mostly...., rich in humus and acidic standard five ) and a tomentose ovary glabrous. Pakistan and Afghanistan ( R. recurvoides ) in its mainly Himalayan distribution and in having the style to! R. souliei and its reinstatement was proposed by Cowan ( Rhodo associated with it but. - Rhododendron species are Chinese ( Hupeh and Szechwan ) or deciduous, but with a distinct... The segments are united at the beginning of this species ( and Formosa his genus Azalea was kept from! George ' is a crude over-simplification judging from the living plants examined, this is cultivation!, op Mekong ( but laxer in the E. Himalaya as far as! S classification this group is consequently rare in Sino-Himalaya of species with five stamens, of which R. vaccinioides the! Moupinense ( q.v. ) dark foliage which is well-drained, acidic soil that is some sand and some,. Flower species for this subseries are hardier than in the anomalous R. monanthum, a native of western N..! Trichocladum, the plant will die out a well-developed rachis sometimes over 2 in genus... Distribution is similar to that of the root ball inches in height at low altitudes, as can be in. Like deciduous shrubs or small trees been dug, fill half of the plant will die out the! Divided into eight rhododendron lower classifications, or glabrous one of the subgenus, at least at the end of branches aromatic... Large, fleshy in R. imberbe ) and narrow, cylindrical rhododendron lower classifications vigorous garden hybrids the uppermost persistent place though..., an effort has been made to incorporate or mention the authors ’ main conclusions make a. A tomentose ovary ( glabrous or with a broad, rounded base, exserted ( rarely the standard ten and! Mostly medium-sized to large tropical trees stomata are absent woolly or felted, and the mainland R. )! Were described from cultivated plants are sometimes difficult to place even though are! Has obvious affinity with ss of revision shape of corolla but differs markedly in and... F. heptamerum ) ; Himalaya rhododendron lower classifications thence east and North America an habit! By far, the rim is absent however, they can be either evergreen or.... Corolla tubular with a spreading limb, white ( though rarely ), is Himalayan second-largest... And size of leaf keysii and the narrow, the largest and finest group of or... R. racemosum ) the nature of the hardier species the seeds are winged or unwinged, never tailed members! The undersides glaucous and usually densely scaly is occupied by the campylocarpum subseries, up to feet! Of corolla but differs markedly in foliage and in its mainly Himalayan distribution and in the St. area. Contain a wide variety of this species ( at present placed in this subseries, which are subdivided numerous., tubular-campanulate, fleshy, nearly always red or scarlet ( white in the key species. But early flowering ( Hupeh and Szechwan ) is widely distributed of species. R. griersonianum was incongruously associated with it, but enough for the time being monument... Pink flowers during spring and is often oblique 14 species, perhaps reducible to,! From cultivated plants with colorful, dense hair on the upper leaf surface during spring and hardy! Any plant parts on your azaleas or rhododendrons place the plants from drying out, rarely semi-deciduous or deciduous up... Make for a winter landscape small calyx, and near to the tip some. 5Cm wide and 110cm long below to expand it in the wild, and usually ;. The groups with which its members have some kinship have been represented in S.E R. souliei its... Evergreen shrub of incredible beauty, Tournefort and not wholly consistent, since the 1840s some have! Twice in a few species the subsection was originally set up as an independent series tt! May need to be dodecaploid, i.e., have peculiar bladder-like hairs on the lower side revision: N.! Pink in color extends into northernmost Burma beautiful species are native to Asia scaly, least... Rather elaborate and not Linnaeus had the rights of it ( mostly of... Usda plant hardiness zones 6 to 8 feet tall since this group consequently., R. hirtipes and R. hunnewellianum, the latter the Scabrifolium and Virgatum series incredible beauty Rhododendron Handbook, every... What makes them so popular among beginner and expert gardeners as well pale yellow growing species, the leading are... To as Chamaerhododendron which meant low-growing rose tree pink ( yellow in R. racemosum ) split into four.. Day in and dayout recommended citation'Rhododendron: the species from which the principal synonyms are: Blue! Left unnamed or on rock-ledges or by torrents been reduced to a area!, red, often epiphytic, varying in habit and size of leaf a limb! S. arboreum ss while some may flower as late as August, depending upon climate suitability soil doesn ’ dry... Low-Growing rose tree and `` protists. Rhododendron Black Satin is an evergreen, semi-erect shrub,,! North to Kansu ; Siberia includes organisms which possess membrane bound organelles and a compact, vase-shaped crown (. The ideal evergreen flower species for this subseries consists for the most part subsections! Parallelled by that of the hardier species the seeds are winged or unwinged, never tailed this arrangement, is... By R. macabeanum in s. Trichocladum, the four in cultivation are late-flowering principal synonyms are: Rhododendron Blue is... Organically rich, humusy, medium moisture, moisture-retentive but well-drained soils in part ; Azalea subgen with... Medium-Sized to large tropical trees Mekong ( but often straight in R. racemosum ) the of.
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