TREATMENT FROM THE JEPSON MANUAL (1993) |
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©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora. |
AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY |
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 23-branched
Fruit: achene, generally 3-sided
Genera in family: ± 110 genera, 3600 species: worldwide, especially temp
Reference: [Tucker 1987 J Arnold Arbor 68:361445]
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 06, persistent, barbs generally recurved; stamens (1)3; style 23-branched, base bulb-like, persistent
Fruit 23-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 |
Perennial < 8 dm, often floating, rhizomed
Stem generally > 0.5 mm wide, spongy, often flattened in pressing
Leaves several, generally spaced, needle-like (1 sheathing, ± appressed, base greenish, tip not expanded, not scarious)
Inflorescence: spikelet 34 mm, wider than stem, linear to ovate, 412-flowered; flower bract greenish to straw-colored, tip ± obtuse
Flower: style 3-branched
Fruit: perianth bristles (0) generally > fruit; body 0.70.8 mm, elliptic to obovate, weakly 3-sided, several-ridged, crossbars 3040 per row, dull yellow-white; tubercle conic, ± flat, base narrowed
Ecology: Marshes, lake edges
Elevation: < 1500 m.
Bioregional distribution: Northwestern California, San Joaquin Valley, Central Western California, Southwestern California
Distribution outside California: s US to S.America
Synonyms: E. acicularis var. r. (Poiret) Britton misapplied