Jepson Flora Project: Jepson Interchange    

 
link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

    THIS PAGE IS NO LONGER UPDATED
    AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY
  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

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.

CYPERUS

NUTSEDGE, GALINGALE

Gordon C. Tucker

Annual or perennial herb, glabrous
Stems generally > 1, erect, 2–100 cm, 3-angled or round
Leaves basal; blades 0 or linear
Inflorescence: bracts 1–9, leaf-like, spreading or erect; rays < 10 cm; spikelets flat to ± cylindric; flower bracts 2-ranked, 1 per flower, 2–36 per spikelet
Flower bisexual; perianth 0; stigmas generally 3
Fruit (ob)ovoid, generally 3-angled, brown, generally not beaked
Etymology: (Greek: name for 1 sp.)
Reference: [Tucker 1983 Syst Bot Monogr 2:1–85]
Mature fruit generally needed for identification. C. unioloides R. Br. and C. virens Michx. probably only waifs in CA.

Introduced

C. rotundus L.

PURPLE NUTSEDGE

Perennial 10–40 cm; stolons with tubers < 1 cm thick
Inflorescence: bracts 2–5, 5–25 cm; rays 5–10, 10–150 mm; spikelets 3–12, 4–40 mm, linear to ± lanceolate, flat, reddish purple, in open, elliptic spikes 1–5 cm wide; flower bracts 6–36 per spikelet, 2–3.4 mm, ovate, 7–9-veined
Fruit 1.4–1.9 mm, elliptic, black, seldom maturing
Ecology: Disturbed soils, croplands
Elevation: 0–250 m.
Bioregional distribution: Great Central Valley, South Coast, Sonoran Desert
Distribution outside California: tropical and warm temperate; native to Eurasia
Flowering time: Jul–Nov
Often considered world's worst weed.

previous taxon | next taxon
bioregional map for CYPERUS%20rotundus being generated
 


Retrieve Jepson Interchange Index to Plant Names entry for Cyperus rotundus
Retrieve dichotomous key for Cyperus
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
Return to the Jepson Interchange main page
Return to treatment index page
Glossary


University & Jepson Herbaria Home Page |
General Information | University Herbarium | Jepson Herbarium |
Visiting the Herbaria | On-line Resources | Research |
Education | Related Sites
Copyright © by the Regents of the University of California