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Published In: Systema Vegetabilium 2: 97. 1817. (Syst. Veg. (ed. 15 bis)) Name publication detailView in BotanicusView 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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2. Fimbristylis autumnalis (L.) Roem. & Schult.

Pl. 77 a–c; Map 287

F. autumnalis var. mucronulata (Michx.) Fernald

Plants annual, tufted, lacking rhizomes. Stems few to many, 5–35 cm long, erect to ascending, glabrous. Leaves with blades 2–10 cm long, glabrous, the margins flat, the top of the sheath with a ligule consisting of a line of short hairs. Inflorescences usually compound umbels, sometimes only simple umbels, the 2–3 bracts shorter than to longer than the inflorescence, at least some of the spikelets usually short- to long-stalked, not hidden by the inflorescence bracts. Spikelets 3–7 mm long, lanceolate to narrowly elliptic in outline, pointed at the tip, the scales 1.0–1.3 mm long, broadly lanceolate, the tip pointed, the back usually strongly keeled, the midvein extended past the scale tip as a short point, glabrous, brown to dark brown with the midvein usually green. Stamens 1(2). Stigmas 3, the style smooth below the branches. Fruits 0.9–1.1 mm long, obovate in outline, strongly 3-angled in cross-section, the surface smooth to sparsely warty, light brown to tan. 2n=10. June–October.

Scattered throughout southern Missouri and locally north along floodplains of rivers (U.S. and adjacent Canada south to Central America, Caribbean Islands; also in the Old World tropics). Sandbars, gravel bars, and mudflats along streams and rivers, margins of ponds and lakes, moist depressions of upland prairies and glades, sandy fields, and moist, disturbed, sandy areas.



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