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.

SCIRPUS

S. Galen Smith, A.E. Schuyler, and William J. Crins

Annual or perennial herb, rhizomed or not; roots fibrous
Stem generally erect, 3-angled or cylindric, solid
Leaves basal or cauline, alternate, 3-ranked; sheaths closed; ligule 0 or present; blades linear, sometimes vestigial and scale-like
Inflorescence panicle- or head-like; bracts 1–several, leaf- or ± stem-like; spikelets 1–many, generally many-flowered; flower bracts spiraled, generally ovate, scale-like
Flower bisexual; perianth bristles generally < and hidden by flower bracts, generally ± straight, generally slender, generally stiff, generally persistent on fruit, generally finely spined or fringed, sometimes 0 or vestigial; stamens generally 3; style 1, ribbon- or thread-like, stigmas 2–3, generally exserted
Fruit: achene, generally obovoid, lenticular or ± 2–3-angled, generally beaked, not tubercled
Species in genus: ± 200 species: generally wet sites, worldwide. Some species mistaken for Eleocharis
Recent taxonomic note: *CA plants treated as Amphiscirpus, Bolboschoenus, Isolepis, Schoenoplectus, Trichophorum [Browning et al. 1995 Brittonia 47:433–445; Smith 1995 Novon 5:97–102]

Native

S. robustus Pursh

Perennial 50–150 cm; rhizome long with 1–2 cm wide tubers
Stems erect, 4–6 mm wide, sharply 3-angled; sides smooth, angles papillate, scabrous
Leaves ± cauline; sheaths clearly veined at top; blades >> sheaths, generally 4–12 mm wide when dry, flat to V-shaped, glabrous, midrib and margin finely scabrous
Inflorescence panicle- or head-like; spikelets ± 6–30, 15–30 mm, (6)8–10 mm wide, generally < 1/2 to > 1/2 in clusters of 1–3 at branch tips; 2–3 bracts >> inflorescence, spreading, leaf-like, longest generally 2–6 mm wide when dry; flower bract strongly appressed, ± 6 mm, ± orange-brown, ± opaque, scabrous, tip notch ± 0.5 mm, awn ± 2–3 mm, ± contorted
Flower: perianth bristles generally 6, < to = fruit, generally deciduous
Fruit ± 3–3.5 mm, weakly 2–3-angled, smooth, dark brown; sides convex; tip truncate, beak 0.1–0.2 mm
Ecology: Marshes
Elevation: < 800 m.
Bioregional distribution: Klamath Ranges, San Francisco Bay Area, South Coast
Distribution outside California: to Mexico, S.America
Hybridizes often with S. maritimus.
Horticultural information: STBL
Recent taxonomic note: *Bolboschoenus robustus (Pursh) Soják

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bioregional map for SCIRPUS%20robustus being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Scirpus robustus
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