14. Rhododendron subsect. Boothia (Hutchinson) Sleumer, Bot. Jahrb. Syst. 74: 530. 1949.
黄花杜鹃亚组 huang hua du juan ya zu
Yang Hanbi (杨汉碧 Yang Han-pi); David F. Chamberlain
Rhododendron ser. Boothia Hutchinson in J. B. Stevenson, Sp. Rhodod. 155. 1930 ["Boothii"].
Shrubs, (0.05–)0.3–2.5(–3) m tall, often epiphytic; young shoots scaly, mostly setose, sometimes otherwise glabrous. Leaves large; leaf blade leathery; abaxial surface whitish papillose or glaucous, scales 0.5–2 × their own diameter apart or sometimes contiguous, saucer-shaped or vesicular, deeply sunk in pits, golden yellow to brown or dark brown; adaxial surface glabrous or scaly, sometimes setose on midrib and veins. Inflorescence terminal, 1–11-flowered; pedicels scaly, usually setose; calyx (1–)2–15 mm, usually 5-lobed, sometimes reduced to undulate rim, scaly, margin mostly ciliate or setose; corolla broadly campanulate or rotate to saucer-shaped, usually yellow, rarely greenish, white or reddish, sometimes spotted, outer surface scaly, sometimes sparsely pubescent; stamens 10; ovary 5(or 6)-celled; style short, thick, sharply bent, usually scaly at base. Capsule ovoid to cylindric-ovoid, 8–17 mm, scaly. Seed prominently winged and finned.
Seven species: Bhutan, China, India, Myanmar, Sikkim; seven species (two endemic) in China.