Hardy Rhododendron Species: A Guide to Identification by James Cullen

By James Cullen

For the enthusiastic novice or skilled rhododendron grower, this landmark reference presents the keys to the actual identity of the approximately three hundred rhododendron species commonly in cultivation. attractive images comprise close-up pictures of flower and leaf, microscope photographs of leaf surfaces, and easy-to-use diagnostic keys, making this a milestone within the id of rhododendrons.

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Additional info for Hardy Rhododendron Species: A Guide to Identification

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11 b Mature leaves obviously hairy beneath over most of the surface . . . . . . . . . . . . . . 18 11 a Style glandular or glandular-hairy over most of its length . . . . . . . . . . . . . . . . 12 b Style neither glandular nor hairy . . . . . . . . . . . . . . . . . . . . . . . . . . 14 46 Subgenus Hymenanthes 12 a Young shoots and petioles hairy or not, but not stipitate-glandular . Subsection Thomsonia (p.

4 4 a Mature leaves glabrous beneath, occasionally with persistent hair bases or sparse hairs near the midrib . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 b Mature leaves conspicuously hairy beneath . . . . . . . . . . . . . . . . . . . . . . 6 5 a Corolla with obvious, dark nectar sacs . . . . . . . . . . . . . Subsection Irrorata (p. 108) b Corolla without dark nectar sacs . . . . . . . .

Augustinii and in some species of subsection Lapponica). Usually there is a blotch of contrasting (usually darker) colour on the upper side of the tube, and spots of a similar colour are often found further up the tube and on the bases of the upper lobes. Such blotches and spots, which presumably help guide visiting insects towards the nectar, are absent in species of section Vireya. The flowers of the species in several groups—notably those which are moth-pollinated, such as subsections Fortunea and Maddenia—are fragrant, especially in the evenings.

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