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FOC | Family List | FOC Vol. 23 | Cyperaceae

5. Eriophorum Linnaeus, Sp. Pl. 1: 52. 1753.

羊胡子草属 yang hu zi cao shu

Authors: Prof. Song-Yun Liang, Gordon C. Tucker & David A. Simpson

Erioscirpus Palla.

Herbs, perennial. Rhizomes creeping. Culms tufted or nearly scattered, obtusely 3-angled, clothed at base with bladeless leaf sheaths. Leaves basal and cauline; leaf blade of basal leaves slender, elongate, flat or 3-angled; cauline leaves usually reduced to a sheath. Involucral bracts spathelike or glumelike, rarely leaflike. Inflorescence a terminal simple or compound anthela or reduced to a single spikelet. Spikelets with few to many spirally arranged deciduous glumes. Glumes each subtending a bisexual flower. Perianth bristles 10-30, white or brownish red, elongating extremely after anthesis, smooth, silky. Stamens 3. Style base not distinct, not or slightly thickened; stigmas 3. Nutlet obovoid to oblong, 3-sided, smooth, apex beaked.

About 25 species: mostly in cool temperate, alpine, and arctic regions of N Hemisphere; seven species (one endemic) in China.

Eriophorum japonicum, recognized by Tang and F. T. Wang (Fl. Reipubl. Popularis Sin. 11: 36. 1961), is a synonym of Scirpus maximowiczii in this treatment (see p. 174).

1 Spikelets solitary, terminal; involucral bracts glumelike   (2)
+ Spikelets many, arranged in a compound or single anthela; involucral bracts leaflike or spathelike   (4)
2 (1) Perianth bristles pale reddish brown to reddish; nutlet spinulate on apical margin.   6 E. russeolum
+ Perianth bristles white or pure white; nutlet smooth   (3)
3 (2) Culms tufted; perianth bristles white; nutlet obovoid; anthers ca. 2 mm.   5 E. vaginatum
+ Culms scattered; perianth bristles pure white; nutlet oblong; anthers ca. 1 mm.   7 E. scheuchzeri
4 (1) Spikelets arranged in a compound anthela; involucral bracts leaflike   (5)
+ Spikelets arranged in a simple anthela; involucral bracts spathelike   (6)
5 (4) Spikelets many, densely congested capitate; glumes reddish brown with red lines, oblong.   1 E. transiens
+ Spikelets solitary or a cluster of 2 or 3; glumes brown, ovate-lanceolate.   2 E. comosum
6 (4) Glumes usually 1-veined; culms ± stout; leaf blade 3-5(-7) mm wide, flat but apex 3-angled.   3 E. angustifolium
+ Glumes many veined; culms ± slender; leaf blade ca. 1 mm wide, compressed 3-angled.   4 E. gracile

Lower Taxa


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