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Published In: Species Plantarum 1: 80. 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: Introduced

 

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1. Avena fatua L. (oats)

Pl. 132 e, f, i; Map 538

Plants annual, forming tufts. Flowering stems 30–120 cm long, erect, sometimes from spreading bases, glabrous. Leaf sheaths rounded on the back, glabrous or less commonly somewhat roughened, the ligule 1.5–5.0 mm long, the margin somewhat uneven and minutely hairy. Leaf blades 8–25 cm long, 3–10(–15) mm wide, flat, glabrous, roughened, or hairy. Inflorescences 10–30 cm long, open panicles with loosely ascending to spreading branches at maturity, erect or more commonly arched to somewhat nodding, the main axis usually somewhat roughened. Spikelets 17–26 mm long (excluding the awns, if present), nodding, slightly flattened laterally, disarticulating above the glumes or not readily disarticulating, with 2 or 3 perfect florets. Glumes 17–26 mm long, longer than the rest of the spikelet (excluding the awns), similar in size and shape, the upper glume slightly longer and wider than the lower glume, narrowly lanceolate to lanceolate, sharply pointed at the tip, strongly 7‑ or 9‑nerved, rounded on the back, awnless, glabrous. Lemmas 14–23 mm long, elliptic‑lanceolate, tapered to 2 narrow teeth (notched) at the tip, 5‑ or 7‑nerved, keeled, glabrous, roughened, or hairy, the base glabrous or with a tuft of hairs 3–5 mm long, awnless or with an awn 15–45 mm long attached above or near the midpoint of the midnerve, this twisted or bent below the middle or less commonly straight to somewhat curved. Palea somewhat shorter than the lemmas, membranous, 2‑nerved. Stamens 3, the anthers 1.5–4.5 mm long. Fruits 7–12 mm long, narrowly elliptic‑oblanceolate in outline, tan to yellowish brown, hairy. 2n=42. May–November.

Introduced, widely scattered nearly throughout Missouri (native of Europe, Asia, introduced sporadically nearly worldwide in temperate regions). Roadsides, railroads, fallow fields, crop fields, gardens, and open, disturbed areas.

 

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1 1. Spikelets usually with 3 florets; lower 2 florets with the lemmas awned, the awns (18–)25–45 mm long, bent or twisted below the middle; lemmas hairy...1A. VAR. FATUA

Avena fatua L. var. fatua
2 1. Spikelets usually with 2 florets; florets awnless or the lowermost floret with the lemma awned, the awn 15–35 mm long, straight or somewhat curved, but not bent or twisted; lemmas glabrous or somewhat roughened...1B. VAR. SATIVA Avena fatua var. sativa
 


 

 
 
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