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Published In: Hortus Regius Botanicus Berolinensis 1: 159. 1827. (Hort. Berol.) Name publication detailView in Biodiversity Heritage Library

Project Name Data (Last Modified On 7/9/2009)
Acceptance : Accepted
Project Data     (Last Modified On 8/6/2009)


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35. Chasmanthium Link

(Yates, 1966a, b)

Plants with C3 photosynthesis, perennial. Aerial stems annual, not woody, unbranched or less commonly few‑branched from near the base. Leaf sheaths open most of their length, the ligule membranous, hairy along the edge (reduced to a fringe of hairs elsewhere). Leaf blades flat, usually with a noticeable midvein. Inflorescences panicles, with mostly numerous spikelets. Spikelets flattened laterally, with 3–20 florets, the axis extended past the uppermost fertile floret and with a terminal, reduced, sterile floret, the lowermost 1–3 florets also sterile, the remaining 2–20 florets perfect, disarticulating above the glumes and between the florets. Glumes 2, about equal in size and shape, shorter than the florets, awnless, keeled, 3–7‑nerved, glabrous or the midnerve roughened. Lemmas awnless, keeled, 5–15‑nerved, glabrous except for the roughened to hairy midnerve. Paleas shorter than the lemmas, strongly 2‑nerved, the nerves usually narrowly and unevenly winged. Stamen 1. Fruits ovate to elliptic in outline, flattened, brown to reddish black or black. Four species, eastern U.S. west to Nebraska and Texas; Mexico.

Yates (1966a, b) presented a variety of data to show that the genus Uniola L., as traditionally circumscribed, contains unrelated species groups that are now placed in different genera in different tribes. True Uniola presently is classified in the tribe Eragrostideae and consists of 2–4 species not found in Missouri that occur mostly in coastal sand dunes.

The species of Chasmanthium all have self‑compatible florets, and C. latifolium sometimes produces spikelets with cleistogamous florets (Tucker, 1990).


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1 Inflorescences open panicles with the branches drooping at maturity; spikelets (15–)20–40 mm long, long-stalked, with 6–20 florets 1 Chasmanthium latifolium
2 Inflorescences narrow panicles with the branches erect or ascending; spikelets 5–18 mm long, short-stalked to nearly sessile, with 3–7 florets 2 Chasmanthium laxum
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