By J. Cullen
For the enthusiastic beginner or skilled rhododendron grower, this landmark reference offers the keys to the actual id of the approximately three hundred rhododendron species commonly in cultivation. an intensive creation locations the paintings in context because it examines the background of Rhododendron class and provides an entire survey of plant constructions during the many species. Species are indexed in systematic order, in order that related species happen as regards to one another within the textual content. those are totally defined, together with entire citations of past references and notes at the incidence of wild-origin specimens in cultivation. attractive images contain close-up pictures of flower and leaf, microscope pictures of leaf surfaces, and easy-to-use diagnostic keys, making this the undeniable quantity for plant id. A milestone within the identity of rhododendrons, this may turn into an important reference for botanists, nurserymen, and fans.
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Extra resources for Hardy Rhododendron Species: A Guide to Identification
Sample text
2. R. praevernum b Corolla without a basal blotch; leaves with a more or less persistent indumentum along the midrib beneath . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1. R. sutchuenense 1. Rhododendron sutchuenense Franchet Illustr ation Millais, Rhododendrons, t. 16 (1917); Iconographia Cormophytorum Sinicorum 3, t. 5–5 cm, slightly curved Distribution western China (northern Sichuan, Shaanxi, Hubei, Guizhou, Guangxi) Flowering spring Hardiness zone 6 Classic wild-collected material is available under Wilson 1232.
This couplet is more complicated than couplet 1 but follows the same general form: 37 38 Rhododendron: Keys and Descriptions 2 a Corolla with a parallel-sided or narrowly flaring tube and spreading limb; stamens and club-shaped style included within the corolla tube; stamens 5–8(–10); plant with a characteristic pineapple-like smell; inflorescence bud scales margined with branched hairs . . . . . . . . . . . . . . . . . Subgenus Rhododendron section Pogonanthum (p. 402) b Corolla rarely shaped as above; stamens and style usually projecting from the corolla tube; style never club-shaped; stamens usually 10; plants variously aromatic but not as above; inflorescence bud scales either without hairs or margined with simple hairs .
5 b Inflorescences and inflorescence buds lateral on the shoots; new vegetative growth continuing the shoot above the inflorescence . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5 a At least some of the leaves evergreen (or, if all deciduous, none longer than 1 cm) . . . . . . . 6 b All leaves deciduous, at least some longer than 1 cm . . . . . . . . . . . . . . . . . . 7 Genus Rhododendron 6 a Leaves generally dimorphic (spring and summer leaves), the summer leaves evergreen (more rarely leaves monomorphic and deciduous but only up to 1 cm long); new shoots from the same terminal bud as the inflorescences; flattened bristles present .