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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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.


Leaves basal, erect, stiff, sheathing
Inflorescence subtended by 2 unequal, leaf-like bracts; spikelet bracts 1–2, sheathing; spikelets in terminal head-like clusters, flat; flower bracts 2-ranked, only uppermost fruiting
Flowers bisexual and staminate; perianth bristles 3–6, generally < 1 mm, deciduous; stamens 3; style 3-branched
Fruit obovoid; tubercle generally 0
Species in genus: ± 80 species: worldwide, especially Australia
Etymology: (Greek: a rush)


S. nigricans L.


Plant 2–7 dm, densely cespitose; rhizomes 0
Leaf > 1/2 stem, ± 1 mm wide, entire to minutely serrate, uprolled; ligule wide, very dark brown
Fruit 3-sided, with a ± white, bony covering
Chromosomes: 2n=44,54
Ecology: Uncommon. Marshes, swamps, springs, generally alkaline soils
Elevation: < 2000 m.
Bioregional distribution: San Bernardino Mountains, Mojave Desert
Distribution outside California: to Caribbean, Eurasia, n Africa
Flowering time: Aug–Sep
Used as roof thatch in Ireland
Horticultural information: TRY.
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for SCHOENUS%20nigricans 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 Schoenus nigricans
Retrieve dichotomous key for Schoenus
Overlay Consortium of California Herbaria specimen data by county on this map
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