Rhododendron identification is done by gestalt: a whole series of clues and queues that are often unconsious. or more wide, white, pink, or rose, commonly six- or seven-lobed. Style nearly always scaly, at least in its lower part. This series, with three species, is the only one endemic to Europe (Pyrenees to Bal­kans) and not closely related to any other series. ss. Taliense). Click below on a thumbnail map or name for species profiles. 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. Griffithianum. Biol., Vol. long, glaucous beneath. Both are Chinese. The species in this group are on the average much larger than other lepidotes, both in the size of the plant and in the dimensions of leaf and flower. Imp. Seeds plain. The innermost of these leaves are partly converted into bud-scales, as can be seen from their flattened, etiolated bases. The corollas usually have the normal five lobes, but seven-lobed corollas are common in s. Fortunei, mostly eight-lobed in s. Falconeri and s. Grande, and there are exceptions in other series also. – Very near to ss. long, often glaucous when young, densely scaly beneath. The number of stamens is often below the standard ten, and very rarely more than that. In Sleumer’s classification, the subgenus Hymenanthes contains but a single section, divided into numerous subsections. Szechwan (where its relative R. rex is also found); and there are two (perhaps three) species in W. Szechwan (see above). ss. ss. Tibet to the Tibetan side of the E. Himalaya and Bhutan; R. beesianum extends into northernmost Burma. Leaves usually less than 1 in. The group is more easily understood if it is realised that the type, R. thomsonii, is not the central species but rather an extreme. It has large green leaves and grows up to 10 feet tall. The series is confined to N.E. This series has now been reduced to a single species, R. campylogynum (q.v. Inflorescence lax, with up to fifteen flowers. A detailed and well-illustrated account of the group by Dr H. Sleumer has been published in Flora Malesiana and is available separately (Series I, Vol. 40-7. The Triflorum subseries (eight species) differs in its constantly yellow or greenish-yellow flowers. ss. The number of stamens is usually double that of the corolla-lobes, though often only approximately so when the latter are in excess of five. Yunnan and bordering part of Tibet through upper Burma to the E. Himalaya as far west as Bhutan. – The ten species in this subseries have flowers with a very small calyx, and the ovary is glabrous. Large or medium-sized shrubs (rarely dwarf). long, deeply lobed, glandular (but very small in R. alutaceum, included because in other respects it resembles the type). It is part of Sleumer’s subgenus Pseudorhodorastrum (see s. Scabrifolium). In s. Falconeri the upper stratum is made up of peculiar funnel- or cup-shaped hairs, which produce a thick indumentum; in a few species these hairs are sparse and there is a thinner indumentum composed mainly of the lower stratum of rosulate hairs. Each flower is 2cm to 3cm in diameter. This is in cultivation, and so too is the newly discovered R. santapaui. – The only member of this series is R. albiflorum (q.v. Leaves persistent, rarely semi-deciduous or deciduous, up to 6 in. Rhododendrons that first started to grow in the 16th century can still be found today. There are three subseries, all three reaching as far west as Sikkim or E. Nepal and as far east as Yunnan. Calyx variable, often very large. The lepidote species are characterised by the presence of scales on various parts of the plant, most obviously on the undersides of the leaves. Inflorescence a dense, many-flowered truss. The flowers have yellow or brown colored flecks on the upper lobe. Only a few are cultivated, these mostly Japanese. Sanguineum. Azalea (L. emend. A more distinctive feature of the group is the rimless, bun-shaped scales on the undersides of the leaves. The corolla is predominantly campanulate with a broad, rounded base, and is often oblique. long. – This pest, believed to be a native of north-eastern North America, made its appearance in Britain at the beginning of this century. The upper scales differ from the lower ones only by having thinner cell walls and they reside in shallower pits which lack stomata. sanguineum Alliance’, Notes Roy. Of this series H. F. Tagg wrote: ‘At first sight this assemblage under one series has a heterogeneous appearance, but analysis shows that it represents an unmistakable phyletic grouping. They grow up to 24 inches in height and spread about 24 inches wide only when mature, having a low canopy. constantly axillary inflorescences are grouped in two subgenera – Rhodorastrum (Maxim.) However, in the supplement to his monograph, published in 1871, he withdrew this diagnosis, confessing that it had been based on inadequate study. Maddenii. Rhododendrons are grown for their spectacular flowers, usually borne in spring. 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. In most of the species the leaves are covered beneath with a thin but continuous covering of rosulate hairs (the so-called ‘plastered’ indumentum), but in R. insigne the indumentum is silvery and burnished. sect. & Wils., in part; Rhod. resembles R. thomsonii in shape of corolla but differs markedly in foliage and in having the style glandular to the tip. Although the indumentum is usually woolly, there is great diversity in hair-structure in this series (Cowan, op. Plants of the Heath Family The Heath family is as exciting to know as blueberries and huckleberries (Vaccinium).This family includes mostly shrubs (some herbs and trees) with usually alternate, often evergreen leaves. It is quite popular because of the contrasting beauty of its red flowers. Corolla red or pink, fleshy, tubular. Corolla usually campanulate or tubular-campanulate, white, rose, pink or yellow, five-lobed, up to 13⁄4 in. But some species are evergreen, e.g., R. viridescens (which is also late-flowering), and a completely deciduous habit is found in some other lepidote species. Asia (including Japan). In a few species, however, notably R. floribundum and R. hunnewellianum, the covering is woolly; these (group aa. Edin., Vol. The treatment was rather elaborate and not wholly consistent, since the numerous combinations existing in R. aperantum were left unnamed. But some series are certainly entitled to rank as sections, e.g., s. Anthopogon, s. Ovatum, and s. Stamineum, while the azaleas, which in Species of Rhododendron are grouped in a single series, represent two whole sections of Maximowicz’s classification, each of which should probably rank as a subgenus. Adenogynum) and a tomentose ovary (glabrous or almost so in ss. Yunnan and bordering parts of Tibet, in the alpine and subalpine zones. ), is of uncertain taxonomic status and perhaps wrongly placed in the subgenus Azalea. The only other species in the subseries is known only from a single collection and is not cultivated; it is geographically far removed from R. cerasinum (W. Szechwan). China. Gard. Cerasinum. There are about 1000 species of Rhododendrons. References to these important revisions, which have been of great assistance in preparing this new edition, are given below in the appropriate place. The classification currently used in Britain was devised by Sir Isaac Bayley Balfour of the Royal Botanic Garden, Edinburgh, and further developed by other botanists there after his death in 1922. subgen. Their root systems are shallow. – Of the two closely allied species in this subseries only R. calophytum is cultivated. Fortunei in the glabrous style and differently shaped leaves and from ss. Ovary five-celled; style very short. They should be pruned only after flowering so that removal of current season’s flowers can be avoided. The flowers are funnel-shaped in a light shade of yellowish green with dark, red-colored nectarines. Yunnan. 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. A genus as large and varied as Rhododendron becomes comprehensible only if its species are systematically arranged according to their affinity. long, fleshy, scarlet or crimson, with darker nectar-pouches. Ten species from N.W. Inflorescence terminal with seven to fifteen flowers. It has a wide range, from S.W. – Corolla campanulate or tubular-campanulate with conspicuous nectar-pouches at the base, fleshy. s. Semibarbatum. Wild species of Rhododendrons can grow from sea level to up to 19000 feet in elevation. The flowers are produced in round, fairly large trusses. There is much to be said for keeping all the lepidote rhododendrons in a single subgenus, at least for the time being. Stamens commonly five, occasionally up to ten, included in the tube. The Augustinii and Yunnanense subseries are essentially Chinese in distribution, being absent from the Himalaya and rare west of the Salween; mainly they are thicket-forming shrubs of open places or light woodland at moderate elevations. Dr Sleumer, the leading authority on this group, classes it as subgenus Rhododendron section Vireya, divided into seven subsections. This subseries is most numerously represented in the eastern United States, where there are about fifteen species and numerous natural hybrids; the others are natives of western N. America, western Eurasia, China, and Japan (one species in each of these four regions). Corolla usually campanulate or tubular-campanulate, white or pink, or the flowers resemble those of bewitched. Be said for keeping all the cultivated plants are closely related species, allied to s. Campanulatum, in! ; Azalea subgen R. fragariiflorum, provisionally included in the 17th century also axillary in R. spinuliferum ) neither! In winter short for the genus, tubular-campanulate, fleshy, scarlet or crimson some have! Until all the lepidote rhododendrons are in the rainier parts of yunnan and N.E organically rich, acidic soil in. 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