|University of California, Berkeley|
|Directory News Site Map Home|
|Jepson eFlora: Taxon page
Key to families | Table of families and genera
Indexes to all accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Annual, perennial herb, often rhizomed or stoloned, often of wet open places; roots fibrous; generally bisexual. Stem: generally 3-sided, generally solid. Leaf: generally 3-ranked; base sheathing, sheath generally closed, ligule generally 0; blade (0 or) linear, parallel-veined. Inflorescence: spikelets generally arranged in head-, spike-, raceme-, or panicle-like inflorescences; flower generally sessile in axil of flower bract, enclosed in a sac-like structure (perigynium) or generally not. Flower: small, generally wind-pollinated; perianth 0 or generally bristle like; stamens generally 3, anthers attached at base, 4 chambered; ovary superior, chamber 1, ovule 1, style 2–3-branched. Fruit: achene, 2–3 sided.
± 100 genera, 5000 species: especially temperate. [Ball et al. 2002 FNANM 23:1–608] Difficult; taxa differ in technical characters of inflorescence, fruit. In Carex and Kobresia, what appear to be pistillate flowers in fact are highly reduced inflorescences (whether or not the same applies to staminate flowers is still under debate). In some other works (e.g., FNANM) these are called spikelets, and they are treated as being arranged in spikes. Here and in TJM (1993), what appear to be pistillate flowers are called pistillate flowers in Carex (and they are treated as being arranged in spikelets), but spikelets in Kobresia (and they are treated as being arranged into spikes). Though internally inconsistent, the approach here is consistent with traditional usage, and reflects a preference for character states that may be determined in the field. —Scientific Editors: S. Galen Smith, Thomas J. Rosatti, Bruce G. Baldwin.
Unabridged references: [Tucker 1987 J Arnold Arbor 68:361–445; Bruhl 1995 Australian Syst Bot 8:125–305]
Key to Cyperaceae
Annual, perennial herb, glabrous. Stem: generally > 1, erect, 2–100 cm, 3-sided or cylindric. Leaf: basal; blade 0 or linear. Inflorescence: terminal, generally ± umbel-like, with spikes on rays; inflorescence bracts 1–9, leaf-like, spreading or erect; rays <= 20 cm; spikelets flat to not flat; flower bracts 2-ranked, 2–36, each with 1 flower in axil. Flower: bisexual; perianth 0; stamens (1–2) 3; stigmas 2–3. Fruit: (ob)ovoid, generally 3-angled, brown, generally not beaked.Key to Cyperus
± 600 species: temps, tropics worldwide. (Greek: name for European Cyperus longus) [Tucker 1994 Syst Bot Monogr 43:1–213] Mature fruit generally needed for identification. Cyperus gracilis R. Br., Cyperus owanii Boeck. [Cyperus ligularis L., misappl.], Cyperus regiomontanus Britton, Cyperus retrorsus Chapm., Cyperus virens Michx., urban weeds in California. Cyperus prolifer Lam. not in California.
Annual 20–30 cm. Stem: 3–10, 3-sided. Inflorescence: inflorescence bracts 4–7; rays 4–8, 1–50 mm; spikelets ascending, 4–20 mm, ± linear to elliptic, flat; flower bracts 1.3–1.8 mm, obovate to round, notched with point <= 0.12 mm, brown to golden brown, lateral veins 2. Flower: stigmas 3. Fruit: 1.2–1.4 mm, obovoid, fine-pitted, glossy.
Ditches, pond shores; < 100 m. Sacramento Valley (Yuba Co.); eastern United States; Mexico, Central America, South America, Old World. 1st collected in California in 1999. Aug–Oct [Online Interchange]
Previous taxon: Cyperus involucratus
Next taxon: Cyperus laevigatus
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Oct 1 2014
Citation for this treatment: [Author of taxon treatment] 2013. Cyperus, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=21856, accessed on Oct 1 2014
Copyright © 2014 Regents of the University of California
We encourage links to these pages, but the content may not be downloaded for reposting, repackaging, redistributing, or sale in any form, without written permission from The Jepson Herbarium.
|Geographic subdivisions indicated for the distribution of Cyperus iria|| Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
READ ABOUT YELLOW FLAGS
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).
View elevation by latitude chart
| Data provided by the participants of the Consortium of California Herbaria.
View all CCH records
CCH collections by month