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Carex venusta Dewey
DARKGREEN SEDGE
Life   Plantae   Monocotyledoneae   Cyperaceae   Carex


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Carex venusta Dewey
darkgreen sedge


General Information
Symbol: CAVE7
Group: Monocot
Family: Cyperaceae
Duration: Perennial
Growth Habit : Graminoid
Native Status : L48   N
Data Source and Documentation
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green round image for nativity Native blue round image for introduced Introduced ocre round image for introduced and nativity Both white round image for no status Absent/Unreported
image for native, but no county data Native, No County Data image for introduced, but no county data Introduced, No County Data both introduced and native, but no county data Both, No County Data
Native Status:
lower 48 status L48    Alaska status AK    Hawaii status HI    Puerto Rico status PR    Virgin Islands status VI    Navassa Island NAV    Canada status CAN    Greenland status GL    Saint Pierre and Michelon status SPM    North America NA   

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Synonyms

Classification

Click on a scientific name below to expand it in the PLANTS Classification Report.
Rank Scientific Name and Common Name
Kingdom Plantae – Plants
Subkingdom Tracheobionta – Vascular plants
Superdivision Spermatophyta – Seed plants
Division Magnoliophyta – Flowering plants
Class Liliopsida – Monocotyledons
Subclass Commelinidae
Order Cyperales
Family Cyperaceae – Sedge family
Genus Carex L. – sedge
Species Carex venusta Dewey – darkgreen sedge

Subordinate Taxa

The Plants Database includes the following 2 subspecies of Carex venusta . Click below on a thumbnail map or name for subspecies profiles. Plant is native (blue) Native Plant is introduced Introduced Plant is introduced Native and Introduced Related taxa legend Distribution of <i>
Carex venusta</i>
Dewey var. <i>
minor</i>
Boeckeler
Carex venusta var. minor
darkgreen sedge Distribution of <i>
Carex venusta</i>
Dewey var. <i>
venusta </i>
Carex venusta var. venusta
darkgreen sedge

Legal Status

Threatened and Endangered Information:
This plant is listed by the U.S. federal government or a state. Common names are from state and federal lists. Click on a place name to get a complete protected plant list for that location.
Maryland dark green sedge Threatened

Wetland Status

Interpreting Wetland Status

North America
Atlantic and Gulf Coastal Plain FACW
Eastern Mountains and Piedmont OBL
Northcentral & Northeast OBL

Related Links

More Accounts and Images
Flora of North America (CAVE7)
Integrated Taxonomic Information System (CAVE7)
USF Atlas of Florida Vascular Plants (CAVE7)
University of Tennessee Herbarium (Distribution) (CAVE7)

Wildlife

Food

Source Large Mammals Small Mammals Water Birds Terrestrial Birds

Cover

Source Large Mammals Small Mammals Water Birds Terrestrial Birds

Description of Values

Value Class Food Cover


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Following modified from Flora of North America
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FNA Vol. 23 Page 462, 468, 469, 470 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 23 | Cyperaceae | Carex

316. Carex venusta Dewey, Amer. J. Sci. Arts. 26: 107, plate T, fig. 62. 1834.

Dark-green sedge

Carex oblita Steudel; C. venusta var. minor Boeckeler

Plants densely cespitose. Culms dark maroon at base; flowering stems 30—90 cm, longer than leaves at maturity, 0.8—1 mm thick, glabrous but scabrous within inflorescence. Leaves: basal sheaths maroon, bladeless, glabrous on back; others grading from maroon to green on back, pale brown-hyaline and red dotted on front, pubescent near apex; blades flat, 2.8—7.2 mm wide, glabrous on both surfaces, margins smooth or finely scabrous. Inflorescences: peduncles of lateral spikes slender, 5—100 mm, finely scabrous; peduncle of terminal spike less than 15 mm, finely scabrous; proximal bracts equaling inflorescences or shorter; sheaths 10—70 mm; blades 1.5—3.5 mm wide. Lateral spikes 3—5, 1 per node, well separated, erect to nodding or drooping at maturity, pistillate with 10—40 perigynia attached 1—3 mm apart, narrowly oblong-cylindric, 10—50 × 4—5 mm. Terminal spike staminate or sometimes gynecandrous with a few pistillate flowers distally, 12—55 × 1—2 mm. Pistillate scales suffused with reddish brown to chestnut with hyaline margins and broad green midrib, ovate-oblong, shorter than mature perigynia, apex obtuse, acute, or sometimes mucronate, glabrous except scabrous midrib. Perigynia olive-green, copiously red dotted, conspicuously 10—12-veined, veins about equal in size, loosely enveloping achene, ovoid-ellipsoid to lance-ovoid, 4.6—9 × 1.2—2.2 mm, membranous to coriaceous, base with short stipe, apex tapering to very short beak, glabrous or short-pubescent; beak minutely bidentate, 0.3—0.8 mm, ciliate between apical teeth. Achenes distinctly stipitate, 2—2.5 × 1—1.5 mm, stipe 1—1.5 mm. 2n = 42, 44, 46, 48, 50.

Fruiting late spring—early summer. Swamp forests, bogs, wet places in pine forests, bays, hammocks, roadside ditches; Ala., Del., D.C., Fla., Ga., La., Md., Miss., N.J., N.Y., N.C., S.C., Tenn., Va.

Carex venusta has been divided into two varieties: one with glabrous perigynia and slightly smaller perigynia and the typical variety with pubescent perigynia. Both varieties are named from types from the Gulf coastal plain. Varieties are not recognized here because variability in the characters used to separate them is greater within populations than between populations. However, there do seem to be two taxonomic entities within this species: one with a distribution from Texas to North Carolina and the other with a distribution from North Carolina to Long Island, New York. The two groups differ slightly in perigynium size and shape and have different, but overlapping, series of chromosome numbers and strikingly different allozyme patterns (M. J. Waterway 1988). The northern group always has glabrous perigynia while the southern group has both glabrous and pubescent perigynia, often in the same population. Whether to recognize these variants as varieties of C. venusta or as distinct species is the subject of ongoing study. Hybrids between both groups and C. debilis have been confirmed.

Updated: 2019-09-19 19:08:39 gmt
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