Poa bulbosa, bulbous bluegrass

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Intermountain Flora
Densely tufted perrenials from somewhat bulbous bases, purplish below, the rhizomes absent; culms wiry, (2) 3-5 (6) dm tall; innovations numerous; sheaths open nearly to the base, smooth; lingules 1.5-4 (6.5) mm long, obtusish to acuminate, entire or somewhat erose; blades flat to usually folded or loosely involute on drying, 1.5-4 mm broad, somewhat scabrous; panicles (3) 4-7 (12) cm long, usually compact and crowded, sometimes oviod, the branches ascending and scabrous; spikelets nearly always proliferous with the 4 to 6 florets produced into bulblets with broad, shiny, dark purple bases and protuding foliaceous linear tips, the bulbils as long as 2 mm; glumes narrow, the first 2-3 (3.5) mm long, the second 2.2-3.5 (4) mm long; lemmas (2.5) 3-5 (6.5) mm long; normal lemmas rarely present, but if present 4-6 per spikelet, pubescent on the nerves and cobwebby at the base, the modified spikelets usually producing a single bulbil that is capable of rooting immediately and asexually producing a new plant; 2n = 14, 21, 28, 39, 40-58.

Cronquist, A., Holmgren, A.H., Holmgren, N.H., Reveal, J.L., and Holmgren, P.K. (1977) "Intermountain Flora" pg. 234, vol. 6, The New York Botanical Garden New York.