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FOC | Family List | FOC Vol. 23 | Cyperaceae

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.

1 Perianth bristles absent; nutlet broadly obovoid or narrowly obovoid, ca. 0.9 mm wide; involucral bracts not awned   (2)
+ Perianth bristles 6-9; nutlet ovoid or oblong, 0.6-0.7 mm wide; involucral bracts awned   (3)
2 (1) Flower bisexual; nutlet oblong-obovoid, ca. 1.5 mm, 3-sided; stigmas 3.   5 T. pumilum
+ Flower unisexual; nutlet broadly obovoid, ca. 2 mm, plano-convex; stigmas 2.   6 T. distigmaticum
3 (1) Inflorescences consisting of 2-4 spikelet clusters (sometimes reduced to a single terminal spikelet in T. mattfeldianum); stolons absent   (4)
+ Inflorescences reduced to a single terminal spikelet; stolons present   (5)
4 (3) Culms 3-angled; stamens 6.   1 T. mattfeldianum
+ Culms terete; stamens 3.   2 T. subcapitatum
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.   3 T. alpinum
+ Glumes 4-4.5 mm, apex with a scabrous awn; perianth bristles 7-9, ca. 3 × as long as nutlet, curved.   4 T. schansiense

Lower Taxa


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