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.



Annual or perennial herb
Stem generally round, ridged and grooved, generally solid
Leaves basal, 1(–4); base sheathing; blade generally 0
Inflorescence: spikelet solitary, terminal, erect; spikelet bract 0; flower bracts generally spiraled
Flowers bisexual; perianth bristles 0–6, persistent, barbs generally recurved; stamens (1–)3; style 2–3-branched, base bulb-like, persistent
Fruit 2–3-sided or round; top tubercled
Species in genus: ± 250 species: worldwide
Etymology: (Greek: marsh grace)
St shape best seen in fresh material (or just below spikelet); drying exaggerates ridges and grooves.


E. parvula (Roem. & Schult.) Bluff, Nees & Schauer


Perennial < 1 dm; rhizome 0
Stem often spongy when fresh, flattened in pressing
Leaf membranous
Inflorescence: spikelet 2–3.5 mm, wider than stem, ovate, 2–9-flowered; flower bract ovate, greenish to brownish, tip obtuse to acute
Flower: style 3-branched
Fruit: perianth bristles generally = fruit; body 1–1.3 mm, obovate, strongly 3-sided, straw-colored, shiny; tubercle base not narrowed
Chromosomes: 2n=8,10
Ecology: UNCOMMON. Wet, generally saline flats, marshes
Elevation: < 2500 m.
Bioregional distribution: North Coast, Great Basin Floristic Province, Desert
Distribution outside California: circumboreal
Flowering time: Jul–Aug
Synonyms: var. coloradoensis (Britton) Beetle
Plants from interior North America sometimes separated.
See the CNPS Inventory for information about endangerment and rarity.
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