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.
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
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.
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