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Project Name Data (Last Modified On 10/23/2012)

Flora Data (Last Modified On 10/23/2012)
PlaceOfPublication Frodr. 1:224. 1810.
Description Plants annual or perennial, the culms simple, terete or angulate, leafless; spike- let solitary, terminal, erect, few- to many-flowered, not involucrate, the scales spirally imbricate; perianth of 1-6 bristles, frequently wanting; stamens 1-3; style 2- to 3-cleft; achene biconvex or 3-angulate, the style base usually persistent as a tubercle.
Note About 150 species, widely distributed.
Key a. Scales firm, indurate, scarcely keeled. b. Culms acutely 3-angulate above; achenes with strong horizontally elongated cells. c. Achene not constricted, gradually prolonged into a cellular beak. 1. E. MUTATA cc. Achene constricted below the summit into a neck about half the width of the achene - -- 2. E. FISTULOSA bb. Culms terete. c. Culms transversely septate ---3. E. INTERSTINCTA cc. Culms not septate - - 4. E. PLICARHACHIS aa. Scales thin, keeled or nerved. b. Style 2-cleft. c. Plants perennial, with rhizomes - ---- 5. E. NODULOSA cc. Plants annual, with fibrous roots -- - 6. E. CARIBAEA bb. Style 3-cleft. c. Culms 3-8 mm. thick - - -7. E. GENICULATA cc. Culms less than 2.5 mm. thick. d. Achene cancellate ---8. E. RETROFLEXA dd. Achene smooth or obscurely reticulate. e. Plants annual. f. Achenes 1 mm. long - ---- - - 9. E. MINIMA ff. Achenes 0.5-0.6 mm. long - ----10. E. NIGRESCENS ee. Plants perennial; achenes white or nearly so -11. E. FILICULMIS
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