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7. Dasymaschalon (J. D. Hooker & Thomson) Dalla Torre & Harms, Gen. Siphon. 174. 1901.
皂帽花属 zao mao hua shu
Authors: Bingtao Li, Jing Wang & Richard M. K. Saunders
Unona sect. Dasymaschalon J. D. Hooker & Thomson, Fl. Ind. 1: 134. 1855.
Small trees [rarely climbers], indument of simple hairs. Petiole short; leaf blade venation arcuately looped near margin. Inflorescences axillary, 1-flowered. Flowers bisexual. Sepals 3, valvate. Petals (2 or)3, in 1 whorl alternate with sepals, valvate, apically connivent to form a mitriform dome (floral chamber) over reproductive organs and often with very small basal apertures between petals. Stamens many; connectives apically truncate or apiculate; pollen inaperturate, in monads. Carpels many, free; ovary densely hairy; ovules 1 to many per carpel. Fruit apocarpous; monocarps stipitate, ellipsoid when 1-seeded or moniliform when more than 1-seeded, fleshy, with a terminal apiculus. Seeds 1-6 per monocarp, globose or ellipsoid.
About 30 species: tropical and subtropical Asia; six species (two endemic) in China.
Dasymaschalon was included within Desmos in FRPS (30(2): 45-53. 1979) but is supported by molecular studies and is easily distinguished morphologically by the absence of an inner whorl of petals (J. Wang et al., Syst. Bot. 34: 252-265. 2009).
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| 1 |
Leaf blade midvein adaxially hairy; petiole densely hairy; sepals ovate, 7-16 × 4-9 mm; fruiting pedicel densely hairy. |
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1 D. trichophorum |
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Leaf blade midvein adaxially glabrous; petiole glabrous or sparsely hairy; sepals triangular, 1-4 × 1.5-4 mm; fruiting pedicel glabrous or sparsely hairy |
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(2) |
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| 2 (1) |
Leaf blade 6-8.5 cm; petiole 2.3-3.3 mm; stamen connectives apically apiculate; pollen verrucate; monocarp stipes 2.5-3 mm; seeds 5-6 mm. |
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2 D. robinsonii |
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Leaf blade 10.5-21.5 cm; petiole 4.4-11 mm; stamen connectives apically truncate to rounded; pollen echinate; monocarp stipes 4-18 mm; seeds 6.5-24 mm |
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(3) |
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| 3 (2) |
Leaf blade base slightly cordate; floral chamber ca. 20% of petal length. |
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3 D. glaucum |
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Leaf blade base rounded or slightly attenuate; floral chamber 50%-90% of petal length |
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(4) |
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| 4 (3) |
Petiole glabrous; petals ca. 7 cm; monocarps 8.5-10 mm wide; monocarp stipes ca. 1.8 cm. |
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4 D. tibetense |
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Petiole sparsely hairy; petals 2-4.5 cm; monocarps 4.5-8 mm wide; monocarp stipes 0.6-1.3 cm |
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(5) |
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| 5 (4) |
Floral chamber ca. 50% of petal length; monocarps 1.1-2 cm; seeds globose, ca. 1.3 × as long as wide. |
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5 D. rostratum |
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Floral chamber ca. 90% of petal length; monocarps 3-5 cm; seed ellipsoid, 3.5-6 × as long as wide. |
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6 D. sootepense |
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Lower Taxa
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