|Jepson Flora Project: Jepson Interchange|
|TREATMENT FROM THE JEPSON MANUAL (1993)||
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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.
Annual or perennial herb 215 cm
Leaves several, generally spaced, needle-like (1 loosely sheathing, base reddish, tip abruptly expanded and scarious)
Inflorescence: spikelet 37 mm, wider than stem, ± linear, 515-flowered; flower bract straw-colored with (reddish) brown stripes, tip ± obtuse
Flower: style 3-branched
Fruit: perianth bristles 0 or 3; body 0.71 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.
Annual; rhizome 0
Fruit: crossbars ± 3040 per row; perianth bristles generally 0 (or weak, appressed to fruit)
Ecology: Marshes in sagebrush scrub to lodgepole-pine forest
Elevation: 9002500 m.
Bioregional distribution: Northwestern California, Cascade Range, Sierra Nevada, Modoc Plateau
Distribution outside California: to Washington, north-central US, n Mexico
Synonyms: E. b. (Piper) Svenson