Flora of North America species comparison

60-80 (150) cm, initially prostrate, usually becoming erect.

35-180 cm, prostrate to erect when young, becoming erect at maturity.

of the basal leaves pilose, upper sheaths usually glabrous;

ligules 1-6 mm, obtuse;

blades 6-30 cm long, 2-20 mm wide, glabrous or pilose.

smooth or scabridulous;

ligules 2-8 mm, truncate to acute;

blades 8-45 cm long, 3-14 (25) mm wide, scabridulous.

15-35.5 (50) cm long, 6-12 cm wide, erect or nodding.

(6)15-40 cm long, 5-15 cm wide, nodding.

21-30 mm, with 2-3 florets;

disarticulation beneath each floret;

disarticulation scars elliptic to triangular.

(18)25-32 mm, to 50 mm in 'naked oats', with 1-2 florets (to 7 in 'naked oats');

disarticulation not occurring, the florets remaining attached even when mature.

subequal, 15-30 mm, 7-9-veined;

calluses bearded, hairs 2-3 mm;

lemmas 15-26 mm, densely strigose below midlength, apices acute, biaristate, 2 veins extending 2-4 mm beyond the apices, awns 30-45 mm, arising about midlength, geniculate;

lodicules narrowly triangular, without lobes on the wings;

anthers 2.5-4 mm.

subequal, (18)20-32 mm, 9-11-veined;

calluses glabrous;

lemmas 14-18 mm, usually indurate, membranous in 'naked oats', usually glabrous, sometimes sparsely strigose, apices erose to dentate, longest teeth 0.2-0.5 mm, usually unawned, sometimes awned, awns 15-30 mm, arising in the middle 1/3, weakly twisted, not or only weakly geniculate;

lodicules with a lobe or tooth on the wings, this sometimes very small;

anthers (1.7)3-4.3 mm.

= 28.

= 42.