Jepson Flora Project: Jepson Interchange    

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

SEDGE FAMILY

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.

ELEOCHARIS

SPIKERUSH

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.

Native

E. acicularis (L.) Roem. & Schult.

Annual or perennial herb 2–15 cm
Leaves several, generally spaced, needle-like (1 loosely sheathing, base reddish, tip abruptly expanded and scarious)
Inflorescence: spikelet 3–7 mm, wider than stem, ± linear, 5–15-flowered; flower bract straw-colored with (reddish) brown stripes, tip ± obtuse
Flower: style 3-branched
Fruit: perianth bristles 0 or 3; body 0.7–1 mm, elliptic to obovate, weakly 3-sided with several ridges and many crossbars, dull yellow-white; tubercle widely conic, flat, base narrowed
Ecology: Marshes, meadows, riverbanks, vernal pools, in sagebrush scrub to lodgepole-pine forest
Elevation: < 2500 m.
Bioregional distribution: California Floristic Province, Modoc Plateau
Distribution outside California: to se US, n Mexico; circumboreal
Varieties intergrade in CA.

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bioregional map for ELEOCHARIS%20acicularis being generated
 
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Eleocharis acicularis
Retrieve dichotomous key for Eleocharis
Overlay Consortium of California Herbaria specimen data by county on this map
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