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6. Trichophorum Persoon, Syn. Pl. 1: 69. 1805.
针蔺属 zhen lin shu
Authors: Prof. Song-Yun Liang & Gordon C. Tucker
Herbs, perennial. Culms tufted, naked but clothed at base with a few bladeless ligulate leaf sheaths. Leaf blade much reduced. Involucral bract 1, glumelike, suberect, apex mucronate or awned. Inflorescences reduced to a single terminal spikelet, rarely an anthela or capitate with a few spikelets. Spikelets ellipsoid. Glumes pale brown, spirally arranged, membranous, deciduous, all bearing a bisexual flower in axil. Flower bisexual or unisexual. Perianth bristles 6, filiform, silky, usually much elongated after anthesis and overtopping subtending glume. Stamens 2 or 3 or 6. Style base not distinct, slightly thickened, ± persistent. Nutlet obovoid, 3-sided or dorsiventrally compressed, smooth, apex slightly beaked.
About ten species: arctic and subarctic regions, alpine areas in temperate and tropical regions; six species (one endemic) in China.
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| 1 |
Perianth bristles absent; nutlet broadly obovoid or narrowly obovoid, ca. 0.9 mm wide; involucral bracts not awned |
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(2) |
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Perianth bristles 6-9; nutlet ovoid or oblong, 0.6-0.7 mm wide; involucral bracts awned |
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(3) |
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| 2 (1) |
Flower bisexual; nutlet oblong-obovoid, ca. 1.5 mm, 3-sided; stigmas 3. |
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5 T. pumilum |
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Flower unisexual; nutlet broadly obovoid, ca. 2 mm, plano-convex; stigmas 2. |
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6 T. distigmaticum |
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| 3 (1) |
Inflorescences consisting of 2-4 spikelet clusters (sometimes reduced to a single terminal spikelet in T. mattfeldianum); stolons absent |
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(4) |
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Inflorescences reduced to a single terminal spikelet; stolons present |
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(5) |
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| 4 (3) |
Culms 3-angled; stamens 6. |
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1 T. mattfeldianum |
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Culms terete; stamens 3. |
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2 T. subcapitatum |
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| 5 (3) |
Glumes 0.9-3.5 mm, apex obtuse and not awned; perianth bristles 4-6, less than 1.5 × as long as nutlet, erect. |
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3 T. alpinum |
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Glumes 4-4.5 mm, apex with a scabrous awn; perianth bristles 7-9, ca. 3 × as long as nutlet, curved. |
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4 T. schansiense |
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Lower Taxa
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