Avenula hookeri |
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spike oatgrass, spikeoat |
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Habit | Plants cespitose, not stoloniferous. |
Culms | 10-75 cm, erect. |
Sheaths | closed for less than 1/3 their length, smooth to scabridulous; ligules 3-7 mm, acute, usually lacerate; blades usually 4-20 cm long, 1-4.5 mm wide, smooth to scabridulous, margins cartilaginous and whitish. |
Panicles | (4)6-11(13) cm long, usually 0.8-2.5 cm wide, erect or ascending; branches 10-25 mm, usually straight, stiff, usually with 1-2 spikelets. |
Spikelets | 12-16 mm, with 3-6 florets; rachilla internodes usually 1.5-2.5 mm, hairs 0.2-1.5 mm. |
Glumes | thin, acute; lower glumes 9-13 mm, 3-veined; upper glumes 9-14 mm, 3-5-veined; calluses bearded, hairs usually shorter than 1 mm; lemmas 10-12 mm, awned, awns 10-17 mm, flattened below the bend; paleas 6-8.75 mm; anthers 2.5-5 mm. |
2n | = 14. |
Avenula hookeri |
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Distribution |
CO; MN; MT; ND; NM; SD; VT; WY; AB; BC; MB; NT; QC; SK; YT
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Discussion | Avenula hookeri grows on mesic to dry, open prairie slopes, hillsides, forest openings, and meadows, in montane to subalpine zones, from the Yukon and Northwest Territories to northern New Mexico. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 24, p. 698. |
Parent taxa | Poaceae > subfam. Pooideae > tribe Poeae > Avenula |
Sibling taxa | |
Synonyms | Helictotrichon hookeri |
Name authority | (Scribn.) Holub |
Web links |