78 METASPERMAE OF THE MINNESOTA VALLEY. 
POA Linn. Gen. 55 (1787). 
Leucopnoa GrisEsB. Led., Fl. Ross. IV, 383 (1853). 
Poidium Nees, Lindl. Introd. Nat. Syst. ed. 2, 450 (1835). 
Benth. and Hook., Gen. Pl. III, 1196; Durand, Ind. Gen. Phan. 478; 
Engler and Prantl, Nat. Pflanz. 2, II, 73 (Hackel). 
Living species: 100; cosmopolitan; tropical mts. Eu- 
rope, 41; Russia, 25; N. America, 40; Canada, 29; Pl. King, 
11; Pl. Wheel., 10; Rocky mts., 12; E. Sts., 10; S. Sts, 8; 
Calif., 10-11. 
Poa nemoralis Linn. Spec. 69 (1753). 
Festuca airoides LAM. Enc. Meth. II, 464 (1786). 
Poa cinerea, VILL. Dauph. II, 156 (1787). 
P. debilis THuitu. FI. Par. 43 (1790}. 
P. nutans Gitip. Exerc. Phyt. II, 532 (1792). 
P. juncea Sut. FI. Helv. I, 46 (1802). 
P. glaucantha GAuD. Alp. III, 36 (1808). 
P. gracilescens SCHRAD. Hort. Gott. I (1809). 
P, glauca Bast. Ess. 39 (1809). 
Aira elodes BRIGN. FI. For. 10 (1810). 
Poa palustris DC. Fl. Fr. WI, 272 (1815). 
Catabrosa elodes R. and 8. Syst. I1, 696 (1817). 
Poa firmula GAup. FI. Helv. I, 239 (1828). 
P, caesia AUCT. AMER., not Sm. 
P. caesia var. strictior GRAY,. Man. ed. V, 628 (1868). 
Wats. and Coult., Gray’s Man. 6 ed. 664; Upham, Fl. Minn. 167; Mac., 
Fl. Can. II, 223, 225: Webb., Fl. Neb. 101; Coult., Fl. Colo. 421; Richt., 
Pl. Eur. I, 85; Led., Fl. Ross. IV, 374: Hook., Fl. Gt. Brit. 492; Nym., Fl. 
Eur.; Wats., King Exp. 386; Cov., Fl. Ark. 237; Hart., Fl. Scand. I, 498; 
Rothr., Alask. 458. 
Arctic and Northern Europe to Mediterranean; Siberia 
to Himalayas. 
North America: Greenland, Labrador, N. 8. to Sas- 
katchewan, N. W. T., Brit. Col. and Rockies; S. to Maine and 
Vt.; W. to Minn., Neb. and Colo. Ark. ? Alaska. 
Minn. valley: Forest district; dry and open places; 
infrequent. 
HERB.: Bailey 469, Agate Bay; Bailey 434, Basswood 
Lake; Sandberg 575, Red Wing; Sandberg 576, Red Wing. 
Poa palustris Linn. Syst. 874 (1759). 
P. serotina Eury. Beitr. VI. 86 (1791). 
_ riparia WouLFr. Hoffm., Fl. Dan. 42 (1791). 
. trifora GitiB. Exerc. Phyt. II, 531 (1792). 
. fertilis Host. Gram. IIT, 10 (1805). 
. hydrophila Pers. Syn. I, 89 (1805). 
. angustifolia WAuL. Fl. Ups. 66 (1820). 
. exigua Dum. Belg. Agr. 113 (1823). 
. crocata Micux. Fl. N. Amer. I, 68 (1803). 
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