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7. Rhododendron subsect. Maculifera (Tagg) Sleumer, Bot. Jahrb. Syst. 74: 544. 1949.

麻花杜鹃亚组 ma hua du juan ya zu

Fang Mingyuan (方明渊); David F. Chamberlain

Rhododendron subser. Maculifera Tagg in J. B. Stevenson, Sp. Rhodod. 144. 1930 ["Maculiferum"].

Shrubs or small trees; bark rough; young shoots tomentose, also with bristles or glandular-setae, bud scales often persistent. Leaf blade oblong-elliptic, oblong-lanceolate or oblanceolate; apex acute apiculate; abaxial surface with a persistent or evanescent stellate tomentum and bristles, more so on the midrib. Inflorescence lax, 5–20-flowered; rachis 2–20 mm. Calyx minute, 2 mm, (8–13 mm in R. longesquamatum); corolla widely or narrowly campanulate, funnel- or tubular-campanulate, 5-lobed, white, pink or deep red; stamens 10(12–14); ovary tomentose glandular-hairy, rarely glabrous.

Thirteen species: China.


1 Calyx 8–12 mm; young shoots with persistent bud scales, densely rufous-tomentose and with dendroid bristles.   264 Rhododendron longesquamatum
+ Calyx 1–3 mm; young shoots without persistent bud scales, without dendroid bristles.   (2)
       
2 (1) Inflorescence rachis 4–5 cm; leaf blade 12–15(–20) × 4–5(–7) cm.   266 Rhododendron polytrichum
+ Inflorescence rachis 0.5–2.5 cm; leaf blade 4–12(–16) × 1.2–4.2 cm.   (3)
       
3 (2) Inflorescence 3–5-flowered; rachis 5–6 mm.   (4)
+ Inflorescence 5–20-flowered, if less than 7-flowered then rachis more than 10 mm.   (7)
       
4 (3) Style densely stipitate-glandular above, brown-lanate-tomentose below; corolla funnelform, ca. 4.2 cm.   275 Rhododendron pilostylum
+ Style glabrous; corolla campanulate, 3–3.5 cm.   (5)
       
5 (4) Corolla purple to pink, with deep purple basal blotch, ca. 3.5 cm; leaf apex obtuse, apiculate.   271 Rhododendron oligocarpum
+ Corolla pale pink to white or creamy white with purple flecks, ca. 3 cm; leaf apex acute or acuminate, apiculate.   (6)
       
6 (5) Petiole with verrucose spots; pedicel puberulent.   272 Rhododendron ziyuanense
+ Petiole sparsely floccose; pedicel glabrous.   270 Rhododendron pachyphyllum
       
7 (3) Rachis ca. 6 mm; corolla crimson, without markings.   267 Rhododendron ochraceum
+ Rachis 10–20 mm; corolla white to pink, sometimes deep red, mostly with dark basal blotches and/or darker flecks.   (8)
       
8 (7) Corolla tubular-campanulate, often deep red, less often red or white; abaxial leaf surface setose, setae glandular or branched at the tip, and persistent, especially near the base, sometimes restricted to midrib.   265 Rhododendron strigillosum
+ Corolla funnelform to campanulate or broadly campanulate, white to pink; abaxial leaf surface tomentose or floccose at least along midrib.   (9)
       
9 (8) Corolla funnelform, lobes ca. 2 × 2.3 cm; stamens 10–14, 3.7–4.8 cm.   276 Rhododendron morii
+ Corolla campanulate or broadly campanulate, lobes 1–1.5 × 1.2–2 cm.   (10)
       
10 (9) Ovary pale brown or rufous tomentose or glabrous.   (11)
+ Ovary glandular.   (12)
       
11 (10) Corolla campanulate; young shoots densely floccose-tomentose or setose.   268 Rhododendron pachytrichum
+ Corolla broadly campanulate; young shoots tomentose.   274 Rhododendron maculiferum
       
12 (10) Adaxial leaf surface grayish floccose and glandular-hairy, glabrescent; inflorescence 5–10-flowered.   269 Rhododendron pseudochrysanthum
+ Adaxial leaf surface glabrous; inflorescence 10–20-flowered.   273 Rhododendron pachysanthum

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