Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.



Raymond Cranfill, except as specified

Annual or perennial herb, often rhizomed, often of wet open places, generally monoecious; roots fibrous, hairy
Stem generally 3-sided
Leaves often 3-ranked; sheath generally closed; ligule generally 0; blade (0) various, parallel-veined
Inflorescence: spikelets variously clustered; flowers generally sessile in axil of flower bract
Flower small, generally wind-pollinated; perianth 0 or bristle-like; stamens generally 3, anthers attached at base, 4-chambered; ovary superior, 1-chambered, 1-ovuled, style 2–3-branched
Fruit: achene, generally 3-sided
Genera in family: ± 110 genera, 3600 species: worldwide, especially temp
Reference: [Tucker 1987 J Arnold Arbor 68:361–445]
Difficult: taxa differ in technical characters of inflorescence and fruit.


Gordon C. Tucker

Annual, glabrous
Stem ± erect, 1–20 cm
Leaves basal, 1–3
Inflorescence: bracts 1–3, leaf-like; spikelets 50–150, dense, spiralled, sessile, in dense, spheric to cylindric spikes; flower bracts spirally arranged, (0)1–2 per flower, 100–400 per spikelet, outer > inner, awned at tip, with 1 central green and 2 lateral whitish veins, margins reddish, inner bract translucent
Flower bisexual; perianth 0; stamens 1–3, anthers 0.2–0.3 mm; styles 2-branched
Fruit 3-angled to subcylindric, abruptly soft-pointed, bumpy or warty, brown
Etymology: (Greek: falling chaff, from translucent inner flower bract)
Reference: [Friedland 1941 Amer J Bot 28:855–861]


L. micrantha (Vahl) G.C. Tucker

Stem 1–10 cm
Inflorescence: spikes 1–3, 3–6 mm, dense, cylindric; outer flower bract widely lanceolate, body 0.8–1 mm, awn 0.1–0.2 mm; inner flower bract 0 or < 1/2 fruit
Fruit 0.7–0.8 mm, widest near middle, finely pitted, light brown; faces convex
Ecology: Wet soil
Elevation: 0–1500 m.
Bioregional distribution: Outer North Coast Ranges, Sierra Nevada Foothills, Great Central Valley
Distribution outside California: US, s Canada, tropical America
Synonyms: Hemicarpha m. (M. Vahl) Pax. including var. minor (Schrad.) Friedl

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