124 MISC. PUBLICATION 200, XT. S. DEPT. OF AGRICULTURE 



about as long as the first floret; lemmas 2 to 3 mm long, sparsely 

 webbed at base, pubescent on the keel and marginal nerves, the inter- 

 mediate nerves obscure. Ql — Occasional in meadows from New- 

 foundland to Delaware and Michigan; Oregon 

 (ballast, near Portland) (fig. 216); introduced 

 from Europe. Differing from P. palustris and 

 P. interior in the very short ligule and the nar- 

 row acuminate glumes. 



37. Poa macroclada Rydb. (Fig. 217.) Culms 

 50 to 80 cm tall, glabrous; ligule prominent, 

 2 to 3 mm long; blades 2 to 3 mm wide; pan- 

 icle open, 10 to 20 cm long, pyramidal, the 

 branches spreading, distant, in twos or threes, as much as 8 cm long, 

 naked on the lower half or two-thirds ; spikelets about 6 mm long, 2- 

 or 3-flowered, purple; glumes 3.5 to 4 mm long; lemmas 4 to 4.5 mm 



long, pubescent on the keel and 

 marginal nerves, the web scant 

 or wanting. 01 — Moist places, 

 at medium altitudes, Colorado, 



Figure 214.— Distribution of 

 Poa bulbosa. 



^=53^ 



Figure 216.— Distribution of 

 Poa nernoralis. 



Montana, and Idaho; a little 

 known species, allied to P. pa- 

 lustris, but with larger spikelets. 

 38. Poa palustris L. Fowl 

 bluegrass. (Fig. 218.) Culms 

 loosely tufted, glabrous, decumbent at the flattened purplish base, 30 

 to 150 cm tall; sheaths keeled, sometimes scaberulous; ligule 3 to 5 mm 

 long, or only 1 mm on the innovations ; blades 1 to 2 nun wide ; panicle 



Figure 215 — Poa nernoralis. Panicle, X 1; floret, X 10. 

 (Hitchcock 23662, Newfoundland.) 



Figure 217.— Poa macroclada. Panicle, X 1; floret, X 10. (Dupl. type.) 



pyramidal or oblong, nodding, yellowish green or purplish, 10 to 

 30 cm long, the branches in rather distant fascicles, naked below; 



