124 MISC. PUBLICATION 200, U. 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. 01 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. 2 17.) 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, 



FIGUBE 214. Distribution of 

 Poa bulbosa. 



FIGURE 216. Distribution of 

 Poa nemoralis. 



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 mm wide; panicle 



FIGURE 215- Poa nemoralis. 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; 



