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24. Streptopus Michaux, Fl. Bor.-Amer. 1: 200. 1803.
扭柄花属 niu bing hua shu
Chen Xinqi (陈心启 Chen Sing-chi); Minoru N. Tamura
Herbs perennial, with a creeping rhizome. Stem erect, simple or distally branched. Leaves alternate, sessile, ovate to lanceolate, thin, many veined, base sometimes amplexicaul. Flowers usually 1 or 2 on an axillary, slender peduncle partly adnate to stem, rarely 2--4 flowers in a terminal inflorescence. Flowers campanulate or subrotate. Tepals 6, free, outer ones usually slightly wider than inner. Stamens 6, inserted at or near base of tepals; filaments usually flat at base; anthers basifixed. Ovary 3-loculed; ovules (2 or 3 or)6--8 per locule. Style columnar or very short. Fruit a berry, globose, several to many seeded.
About ten species: temperate regions of the N hemisphere; five species (two endemic) in China.
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Flowers (2 or)3 or 4 in a terminal inflorescence; tepals cuspidate-caudate at apex |
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1 Streptopus ovalis |
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Flowers 1 or 2, on an axillary, slender peduncle partly adnate to stem; tepals acuminate at apex. |
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(2) |
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| 2 (1) |
Leaves ciliate-denticulate at margin. |
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(3) |
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Leaves entire at margin. |
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(4) |
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| 3 (2) |
Style very short or indistinct; stigma subentire; peduncle curved but not geniculate |
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2 Streptopus koreanus |
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Style distinct, columnar, 3--4 mm; stigma deeply 3-lobed; peduncle geniculate near middle |
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3 Streptopus obtusatus |
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| 4 (2) |
Tepals 8--10 × 3--4 mm; anthers longer than filaments |
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4 Streptopus simplex |
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Tepals 6.5--8 × 1--2 mm; anthers shorter than filaments |
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5 Streptopus parviflorus |
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Lower Taxa
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