Avena flavescens.
Aira flexuosa, distinguished by its nearly basal awn, harder texture and darker colour of paleæ, and Dactylis—awnless and with curved long drawn-out apex—are found as impurities in foreign "seed."
Fig. 69. Avena flavescens. c, “seed," nat. size; a and b, ditto, × about 7. The dorsal twisted and kneed awn is very characteristic. Note also the hairy rachilla. The palea is bifid above—not visible in the lateral view. Nobbe.
Avena flavescens, L. (Fig. [69]).
Yellow. Palea about 5 mm. long, five-ribbed, bifid at the apex into two long slender teeth, closely investing the brownish caryopsis, and with a sub-dorsal awn 10 mm. long with little or no twist, and hairy at the base. Rachilla flattened and with white hairs. Caryopsis not much grooved, fusiform, 2-3 mm. long, glumes unequal, somewhat keeled and rough.
(2) Awn dorsal or basal, fine and hair-like, and little or not at all twisted or kneed. “Seed" small.
✲ A pencil of silky hairs on base or rachilla. Palea bifid at the tip.
† Basal hairs longer than palea, and obscuring the awn.
Calamagrostis Epigeios.
Of little importance. Digraphis has no awn.
Calamagrostis Epigeios, Roth.