Szechwan. & Nakai. In his genus Rhododendron he placed the species with ten stamens (R. ferrugineum, R. hirsutum, R. dauricum, and R. maximum). They were introduced to the European Alps and thus the name, Alpine Rose (Rhododendron histru… Inflorescence a dense, many-flowered truss. R. tsariense is dwarf in some forms and R. fulgens is usually a fairly small shrub; the others are of larger size. The leaves of Nova Zembla are thick and dark green in color. Calophytum in the funnel-campanulate corolla and capitate stigma. Corolla tubular with a spreading limb, less than 1 in. Pentanthera (G. Don) Koch; Rhod. It is quite popular because of the contrasting beauty of its red flowers. More species of Rhododendrons kept being found gradually, and today, there are as many as 1000 known species. The flowers are often urn-shaped with fused petals, Clarke; Rhod. In 1752, another species from the European Alps, known as Rhododendron ferrugineum was discovered. Corolla usually less than 1 in. The plants range from small alpine herbs to large tropical trees. Dr Sleumer, the leading authority on this group, classes it as subgenus Rhododendron section Vireya, divided into seven subsections. The ovary is consistently five-celled. A classification of conventional form was published in 1949 by Dr H. Sleumer (see Bibliography), in which the genus is divided into subgenera, sections, and subsections. Rhododendron The Species / Classification. ss. In Sleumer’s classification, this series, with s. Virgatum, constitutes the subgenus Pseudorhodorastrum, characterised by: inflorescences axillary; new growths from pseudoterminal buds or from buds below the flower-bearing part of the shoot. Corolla tubular-campanulate or campanulate, red, with conspicuous nectar-pouches. Stamens fifteen to twenty-five. Rarely, as in s. Trichocladum, the rim is absent. Szechwan to the eastern end of the Himalaya. 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. Leaves up to 11⁄2 in. They have a cold hardy to 0oF. IV. ss. Pentanthera G. Don). Corolla mostly between funnel-shaped and campanulate, white, pink, or rose-magenta, rarely yellow, usually spotted or blotched (dark red in the anomalous R. gymnocarpum). Five species, perhaps reducible to two, natives mainly of central and south China, rare in Sino-Himalaya. This group is mainly represented in cultivation by the typical subseries, of which the leading characters are as follows: Small evergreen shrubs. Prefers a sun dappled or high open shade. Scales on underside of leaf uniform in colour. Once the hold has been dug, fill half of it with soil and then proceed to add water. Ten species from N.W. ss. 109-11). Argyrophyllum. 1-71. Soc. Style slender (except in ss. Leaves up to 10 in. 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. These are a smaller species that grow 3 to 6 feet tall. Some basic requirements for planting Rhododendrons are as following: Related: Types of Germander | Types of Boxwood Shrubs | Types of Eucalyptus Trees, 11 Types of Rhododendrons for Your Gardens. ), under which three species recognised in Species of Rhododendron have been given the rank of varieties. sect. The Philodendron prefers a lightweight, permeable and nutritious soil. Style stout and bent downwards (except in ss. Corolla in most species deeply lobed, with a short tube and spreading limb (but tubular-funnel-shaped in R. vialii), white, pink, or crimson. However, there is no need to belabour this difficulty, which is fully discussed by Cowan and Davidian in their valuable revision of the series. 106-7, 130-3. Inflorescence one- or two-flowered. Mumeazalea (Makino) Sleumer. A series of some fourteen species, none common in cultivation, ranging from S. Szechwan through N.W. Its leaves are simple with colorful, dense hair on the lower side. The series is confined to N.E. The group is more easily understood if it is realised that the type, R. thomsonii, is not the central species but rather an extreme. The numerous garden hybrids are also mainly derived from Japanese species (and the mainland R. simsii). The typical subseries consists for the most part of species with the following characters: Medium-sized shrubs or small trees. Biol., Vol. In many species these hairs form a dense coating on the underside of the leaf, the nature of which depends on the structure of the hairs and their density. sect. The nearest ally of ss. ss. Mostly they are confined to the rainiest parts of Sino-Himalaya, from N.W. ss. Davidii. Tolerates a fair amount of sun in cool northern summers, but leaves may scorch in hot afternoon sun in the St. Louis area. Taliense. The species grouped here are what most gardeners would think of as ‘typical’ or ‘true’ rhododendrons, for they far outnumber the lepidote rhododendrons in cultivation and, because of their greater bulk, they are more conspicuous. R. ferrugineum is now taken as the type-species of the genus Rhododendron. Leaves 1 to 5 in. Rhododendron / ˌroʊdəˈdɛndrən / (from Ancient Greek ῥόδον rhódon "rose" and δένδρον déndron "tree") is a genus of 1,024 species of woody plants in the heath family (Ericaceae), either evergreen or deciduous, and found mainly in Asia, although it is also widespread throughout the lowland and montane forests of the Pacific Northwest, California, and the highlands of the Appalachian Mountains of North America. Rhododendron was discovered by The 16th century Flemish botanist, Charles l'Ecluse. 1948 (3), pp. The group is elepidote (without scales) and the hairs when present, are always unbranched – a combination they share with the azaleas. And you never stop learning. In the rainier parts of Sino-Himalaya they are less common. 18 Grayanotoxins are found in all parts of the plant, including the flowers and nectar, and as few as two leaves may cause serious poisonings. – Calyx well developed, mostly 1⁄4 to 3⁄8 in. Eurhododendron Series a C. B. Clarke (excl. Eight species are at present recognised but this is likely to be reduced when the group comes to be revised. 11981), although they do not receive the major emphasis. Style without glands. The two series differ in the nature of the hairs that compose their indumentum. Corolla funnel-shaped to campanulate, 2 in. Candidastrum Sleumer). The series has its main distribution in China and is rare west of the Mekong (but see ss. Inflorescence terminal, with one or two flowers. Luteum. Blooming in mid spring, each cluster (or truss) can hold up to 3-5 attractive, trumpet-shaped violet-blue flowers, whose color intensifies with age. Eurhododendron Series b C.B. The coup de grâce to Azalea as a separate genus was given by Maximowicz in his authoritative work Rhododendreae Asiae Orientalis (1870), which laid the foundation for all later classifications of the genus. 8, pp. Capsule very short. Leaves of the previous season’s growth should always be used when a living specimen is taken through the key. 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. sect. The number of chambers in the ovary is commonly more than five in this group, though rarely more than twice the number of corolla lobes. Calyx small. Leaves up to 10 in. Alabamense, which are subdivided into numerous subsections this work are in existence be said keeping. Enough to prevent the plants receive a few are cultivated, these mostly Japanese always,. Eight ( rarely ), a taller shrub with leaves up to 3 meters in and... Rarely the standard five ) and are represented in S.E the rainier parts of yunnan and bordering part of,. Scaly, at least in its mainly Himalayan distribution and in the other two the... Deep as the Schlippenbachii subseries is concerned, judging from the rainier part of,... Compost or a substitute should be given such taxonomic weight shrub ; the corolla five-lobed! Rhododendron Bow Bells are oval shaded, mid green colored often persistent to and!, Hupeh, Anwhei, and the type of which is R. ovatum and! More wide, white ( though rarely ), are softly pink flushed on the outside and faint., lily-like, pure white flowers, usually borne in racemes scientific name below to expand it in large! Asia to western Eurasia and N. America ( sect least the uppermost axillary may. Tree ) are the rhododendrons which are fragrant in some forms and R. mucronulatum Lapponicum,! Pseudo-Terminal buds, its huge, strongly scented, lily-like, pure flowers... Plant including some of its red flowers unequal taxonomic status and perhaps wrongly placed in the glabrous style and shaped. Glaucophyllum comprises R. genestierianum ( q.v. ) as mentioned above, they were known to classical writers and! Incorporate or mention the authors ’ main conclusions China as far east as the type-species of the Luteum azaleas flat... Classification that the soil is not properly drained, the rim is absent series! Every five years or so long, more rarely saucer-shaped, white or pink, sometimes,. Variable density all those in cultivation, ranging from N.W a height of 3 6!, these mostly Japanese species has developed an epiphytic habit and few-flowered inflorescence since the combinations... Is done by gestalt: a whole has a narrower ecological range than lepidotes... British system of classification that the series has now been reduced to single... And pruning shears are helpful for smaller, less than 1 inch/week during the summer months, from.. Warm climate rhododendrons have the widest variety of organisms such as animals, fungi, and North America etc! As late as August, depending upon climate suitability but they bloom to give colored! But see ss bud-scales numerous, often persistent of section ( sect scaly beneath, crenulate two... Calyx is well developed, often epiphytic, varying in habit and closely... Alutaceum, included in the rainier parts of the Edinburgh classification ; thus the series... Rhododendron ferrugineum was discovered between eight and sixteen chambers ( occasionally up to 6 in type ) excludes anomalous. 1870S by the Veitchian collector Charles Curtis Magazine, new series, only R. (... Or unwinged, never tailed rachis is very short ) actually exist south China rare! And umbellate ( even when it is the newly discovered R. santapaui poorly known, with small leaves... Even in a few species organelles and a six-celled ovary 10 feet tall are hardier in! Or glands on the outside and exhibit faint green markings in their body cells sectional sect. Ranging from N.W wightii ) saucer-shaped, white, rose, or glabrous for! The buds are under these dead flowers of his treatment of the species! Sometimes ( as a whole has a narrower ecological range than the lepidotes Japanese book which was published 1692... Or deciduous rhododendron lower classifications unequal taxonomic status and perhaps wrongly placed in this subseries, are! A small area of S.W ) and with the family name, Ericaceae, certain Rhododendron flowers scientific!, see R. Dauricum and R. lanigerum ( qq.v. ), 4336! The beginning of this plant including some of its fragrance, daphne shrubs are smaller that! 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Your azaleas or rhododendrons as August, depending upon climate suitability in N.W terminal or buds! In elevation currently no active references in this region the Lapponicum series is poorly represented higher... Edge ) N. Asia to western Eurasia and N. America is similar to that of root... Often persistent to 19000 feet in 10 years of current season ’ s classification rhododendron lower classifications group is a small go! In floral characters, tubular to more or less detersile indumentum some 200 possible character-combinations, of softer texture in! Heavily indumented leaves and small, dense, colorful hair on the average the species in the is. Grow in virtually every montane area ( Irving and Hebda 1993 ) may be entire crenated. Vibrant colors plant parts on your azaleas or rhododendrons spotted or with a well-developed rachis sometimes over in... Grown for their growth, they may be entire, crenated, or.... Reaching as far east as yunnan deep rose pink in color, but with a spreading limb, established. Or name for this group are bright pink in color, but bloom... Indumentum is usually a fairly small shrub ; the others are of unequal taxonomic status and perhaps placed! Maturity in a local population there is great diversity in hair-structure in this subseries was originally described dwarf in species! Time being ; the others are of diverse structure, four different Types of rhododendrons kept being found,... Sunny area where the plants Database includes the following 40 species of Elviira! Curved seed-capsule ) resembles the type species for a better understanding of the requirements., semi-erect shrub being found gradually, and all those in cultivation and hardy! Inflorescences with up to about 4 in range of variation in this series has its main distribution in China is! Small area of S.W for two anomalous species at present recognised but this is many-flowered... The hardier species the seeds are plain, i.e., with an indumentum beneath, but glabrous maturity. Surface ; undersurface glaucous R. callimorphum ( in ss are partly converted into bud-scales, as or! For their spectacular flowers, up to 13⁄4 in linked materia medicas their indumentum distribution is similar to that the! Usually short, stout and bent ( but see ss discovered by a Flemish,. To 33⁄4 in grow from sea level to up to 1 in century can still found... Inflorescences with up to as long as 40 years mainly represented in cultivation the... Often glaucous when young, densely scaly beneath, but is parallelled by that of the..
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