Poa.]
GRAMINEÆ.
899
B. Two outer glumes reaching more than half-way up the flowering glumes immediately above them. Flowering glumes obtuse or subacute, rarely acute. Anthers 120–110 in. long, linear. | |
* Culms long or short; rhizome tufted or stoloniferous. Leaves flat or complicate or involute, not terete nor polished, not specially rigid, never pungent-pointed. | |
† Rhizome tufted. Ligules reduced to a truncate rim. | |
Culms 6–36 in., usually stout. Leaves flat or concave, 110–14 in. broad. Panicle large; branches usually ternate or quinate. Spikelets ¼–⅓ in. Flowering glumes minutely scaberulous, keel scabrid, callus and lower part of glume usually with a few crisped hairs | 6. P. anceps. |
Culms 4–12 in., slender. Leaves narrow, sometimes filiform. Panicle 1½–3 in.; branches usually binate. Spikelets ⅙–⅕ in. Flowering glumes as in P. anceps but smoother | 7. P. seticulmis. |
†† Rhizome creeping or stoloniferous; ligules short, truncate. | |
Culms 1–9 in. Leaves narrow, setaceous. Panicle ½–2 in., few-flowered. Spikelets ⅛–⅙ in. Flowering glumes usually smooth, callus and lower part of keel and margins with crisped hairs | 8. P. pusilla. |
Culms 6–18 in. Leaves narrow, complicate or flat, flaccid. Panicle 2–5 in., broad, lax. Spikelets ⅓ in. Flowering glumes with the surface and nerves above minutely scabrid, keel sharply scabrid, callus and lower part of glume with long crisped hairs | 9. P. dipsacea. |
Culms 12–18 in. Leaves narrow, complicate, erect, rigid. Panicle 2–5 in., broad, lax. Spikelets ¼ in. Flowering glumes smooth above, lower portion of keel and margins villous, callus with silky hairs | 10. P. Cheesemanii. |
††† Rhizome creeping, stoloniferous; ligules a transverse band of short dense hairs. | |
Culms 12–24 in. Leaves rigid, erect. Panicle 1½–3 in., dense. Spikelets ¼–⅓ in. Flowering glume prominently 5-nerved, surfaces scaberulous, keel sharply scabrid, callus and lower part of keel with sparse crisp hairs | 11. P. chathamica. |
** Culms tufted, strict, erect, smooth and polished. Leaves terete or nearly so, erect, rigid, acute or pungent-pointed. | |
† Ligules almost obsolete. | |
Culms 1–3 ft., forming dense tussocks. Panicle 2–9 in., lax. Flowering glumes prominently 5-nerved, callus and base of keel with a tuft of long crisped hairs | 12. P. cæspitosa. |
†† Ligules long, hyaline, sheathing. | |
Culms 2–18 in. Leaves shorter than the culms. Panicle ½–3 in. Flowering glumes faintly 5-nerved, smooth or nearly so, callus with a tuft of crisped hairs | 13. P. Colensoi. |
Culms 2–6 in. Leaves imbricated, very short and rigid, with acicular points. Panicle ½–1 in., few-flowered. Flowering glumes villous with short silky hairs below the middle, minutely rough above | 14. P. acicularifolia. |