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.

RHYNCHOSPORA

BEAKED-RUSH

Perennial
Stem rounded or 3-sided, leafy, solid
Leaves sheathing
Inflorescence generally subtended by 1+ awn-like bracts; spikelets 1–many in generally terminal clusters; flower bracts spiraled, lower generally sterile, upper generally staminate, others bisexual
Flower: perianth bristles 5–many, persistent; stamens 3; style 2-branched, base much expanded, persistent as tubercle on fruit
Fruit 2-sided
Species in genus: ± 200 species: worldwide, especially tropical
Etymology: (Greek: beaked seed)
Reference: [Gale 1944 Rhodora 46:89–134;159–197;207–249;255–278]

Native

R. alba (L.) Vahl

WHITE BEAKED-RUSH


Inflorescence: flower bracts tawny to whitish
Flower: perianth bristles 10–12, = or > fruit, barbs reflexed
Fruit 1.6–2 mm; body ovoid, pale, faintly ridged
Chromosomes: 2n=26,42
Ecology: UNCOMMON. Marshes, bogs
Elevation: < 2000 m.
Bioregional distribution: c&s Northwestern California (Mendocino, Sonoma cos.), se High Cascade Range (Lassen Co.)
Distribution outside California: circumboreal
Horticultural information: IRR or WET, SUN, DRN: 1, 2, 3, 4, 5, 6, 7, 14, 15, 16, 17.
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for RHYNCHOSPORA%20alba 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 Rhynchospora alba
Retrieve dichotomous key for Rhynchospora
Retrieve multiple-entry key (MEKA) for Rhynchospora
Overlay Consortium of California Herbaria specimen data by county on this map
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