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Published In: Species Plantarum 1: 82. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

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


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1. Aristida adscensionis L. (sixweeks three‑awn)

Pl. 127 a, b; Map 511

Plants annual (perennial elsewhere), with a soft base. Flowering stems (10–)15–60 cm long, glabrous. Leaf blades 1–3 mm wide, flat to strongly inrolled, glabrous or finely hairy on the undersurface. Leaf sheaths glabrous. Lower glume 4–8 mm long, 1/2–2/3 as long as the upper glume, 1‑nerved, glabrous, the tip sharply pointed or with an awn 1–3 mm long. Upper glume 7–11 mm long, 1‑nerved, glabrous, the tip sharply pointed or with an awn 1–4 mm long. Lemmas with the body 6–10 mm long, roughened and often with a somewhat raised midnerve, the awns persistent, not jointed at the tip of the lemma (the awns arise as a continuation of the lemma tip, without a cross‑line), flattened at the base, 7–20 mm long, about equal in length, ascending and straight or somewhat bent outward, but not coiled. 2n=22. July–October.

Uncommon, known only from historical collections from Jackson County (Missouri to California, Mexico, Central America, South America, Caribbean Islands, Africa). Habitat unknown, but presumably upland prairies, dry upland forests, and disturbed, open areas.

The collections from Jasper, Vernon, and St. Clair Counties mapped by Steyermark (1963) could not be confirmed during this study and presumably were based upon misdetermined specimens. Missouri populations are along the eastern edge of this species’ range in the United States. It is widespread and quite variable morphologically and has been separated into a number of ill‑defined varieties by various authors, none of which merit taxonomic recognition.



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