Jepson Herbarium
The University and Jepson Herbaria
University of California, Berkeley
Jepson eFlora: Taxon page
Vascular Plants of California
Key to families | Table of families and genera
Previous taxon Index to 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 |
Next taxon

Cyperus eragrostis


Higher Taxonomy
Family: CyperaceaeView DescriptionDichotomous Key
Common Name: SEDGE FAMILY
Habit: Annual, perennial herb, often rhizomed or stoloned, often of wet open places; roots fibrous; monoecious, dioecious, or flowers 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: unisexual or bisexual, 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(4)-branched. Fruit: achene, 2--3 sided.
Genera In Family: +- 100 genera, 5000 species: especially temperate. Note: Difficult; taxa differ in technical characters of inflorescence, fruit. In Carex and Kobresia, what appear to be individual 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 individual 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. Molecular, morphological, and embryological evidence indicates that Eriophorum crinigerum is to be segregated to a new genus, as Calliscirpus criniger (A. Gray) C.N. Gilmour et al., along with a second, newly described species, Calliscirpus brachythrix C.N. Gilmour et al. (Gilmour et al. 2013); key to genera modified by Peter W. Ball to include Calliscirpus.
eFlora Treatment Author: S. Galen Smith, except as noted
Scientific Editor: S. Galen Smith, Thomas J. Rosatti, Bruce G. Baldwin.
Genus: CyperusView DescriptionDichotomous Key


Common Name: FLATSEDGE, NUTSEDGE, GALINGALE
Habit: 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.
Etymology: (Greek: name for European Cyperus longus) Note: 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.
eFlora Treatment Author: Gordon C. Tucker
Reference: Tucker 1994 Syst Bot Monogr 43:1--213
Cyperus eragrostis Lam.
NATIVE
Habit: Perennial herb 10--90 cm. Inflorescence: inflorescence bracts 4--8, 3--50 cm; rays 0--10, 20--100 mm; heads 1.5--4 cm wide, spheric; spikelets 20--70, 5--20 mm, oblong, flat; flower bracts 6--12, 2--2.3 mm, lance-ovate, beige, acute. Flower: stigmas 3. Fruit: 1.2--1.4 mm, stalked, fine-netted, black or dark brown, tip beaked.
Ecology: Vernal pools, streambanks; Elevation: < 700 m. Bioregional Distribution: CA-FP; Distribution Outside California: to southern British Columbia; temperate South America. Flowering Time: May--Nov
Jepson eFlora Author: Gordon C. Tucker
Reference: Tucker 1994 Syst Bot Monogr 43:1--213
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

Previous taxon: Cyperus difformis
Next taxon: Cyperus erythrorhizos


Please use this Google Form for Contact/Feedback

Citation for this treatment: Gordon C. Tucker 2012, Cyperus eragrostis, in Jepson Flora Project (eds.) Jepson eFlora, https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=21820, accessed on December 02, 2024.

Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora, https://ucjeps.berkeley.edu/eflora/, accessed on December 02, 2024.

Cyperus eragrostis
click for image enlargement
©2012 Neal Kramer
Cyperus eragrostis
click for image enlargement
©2008 Keir Morse
Cyperus eragrostis
click for image enlargement
©2003 Steve Matson
Cyperus eragrostis
click for image enlargement
©2003 Steve Matson
Cyperus eragrostis
click for image enlargement
©2002 Tony Morosco

More photos of Cyperus eragrostis
in CalPhotos



Geographic subdivisions for Cyperus eragrostis:
CA-FP
MAP CONTROLS
1. You can change the display of the base map layer control box in the upper right-hand corner.
2. County and Jepson Region polygons can be turned off and on using the check boxes.
map of distribution 1

(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 occurrence).






 

Data provided by the participants of the  Consortium of California Herbaria.

MAP LEGEND
View all CCH records
All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
READ ABOUT YELLOW FLAGS

CCH collections by month Flowering-Fruiting Monthly Counts

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time (fruiting time in some monocot genera).