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Published In: Hortus Regius Botanicus Berolinensis 1: 287. 1827. (Hort. Berol.) Name publication detailView in Biodiversity Heritage Library

Project Name Data (Last Modified On 9/1/2009)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Native


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5. Fimbristylis vahlii (Lam.) Link

Pl. 76 e–g; Map 290

Plants annual, tufted, lacking rhizomes. Stems few to many, 1.5–10.0 cm long, ascending to spreading, glabrous or less commonly minutely hairy. Leaves with blades 1–15 cm long, glabrous or minutely hairy along the veins and the usually somewhat curled margins, the top of the sheath without a ligule. Inflorescences small headlike clusters of sessile 3–8 spikelets, the 2–4 bracts mostly much longer than and partially hiding the inflorescence. Spikelets 4–9 mm long, lanceolate to ovate or less commonly oblong in outline, usually pointed at the tip, the scales 1.1–1.4 mm long, lanceolate to ovate, the tip pointed, the midvein usually extended past the scale tip as a short point, pale green or translucent white to light tan, glabrous. Stamen 1. Stigmas 2, the style usually with minute papillae below the branches. Fruits 0.5–0.7 mm long, obovate in outline, slightly flattened (broadly oval in cross-section), the surface reticulate, ribbed with 10–15 vertical rows of cells, light yellow to nearly white, sometimes somewhat iridescent. 2n=20. June–October.

Scattered in southern Missouri (southern U.S. south to South America). Mudflats along rivers, sandy margins of ponds, sloughs, and canals, and moist, sandy, disturbed areas.

This species usually forms dense tufts of fine, spreading, hairlike stems, with the spikelets frequently partially obscured by the long inflorescence bracts and leaves.



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