386 BOTANY. 



PoA ALPINA, L., Var. (?) Glaucous and more or less scabrous through- 

 out, stout and tufted; culms 4-15' high; leaves erect, rather thick, the 

 cauUne and often the radical ones very short ; panicle, 1 J-3' long, close, the 

 branches nearly sessile, erect or somev^hat nodding ; upper glume 1|-2J" 

 long, slightly scabrous on the midvein ; lower palet 2 J" long, more or less 

 villous-pubescent at base, obtuse ; perfect grain over 1" long. — The two forms, 

 one with erect rather close panicles, and the other rather loose and nodding, 

 are distributed under separate numbers, (1,312 and 1,313.) The ordinary 

 smoother forms of the species show the glumes and the palets but 1|" or 

 even less in length. Greenland and Labrador ; Northern Maine and Lake 

 Superior, and from the Saskatchewan to Bear Lake and the Rocky Moun- 

 tains ; Colorado ; California, (5068 Bolander.) The variety was collected in 

 the West Humboldt, Clover, and East Humboldt Mountains, Nevada; 

 8-11,000 feet altitude ; June-September. 



PoA CJESiA, Sm., near Var. steictioe. Gray. A low slender form, with 

 a rather contracted panicle of small flowers, 1" or less in length. It is also 

 near forms of P. laxa, Hsenke, which Munro makes identical with P.Jlexuosa, 

 P. arctica, etc., and from which it differs chiefly in its scabrous panicle. 

 From Northern Wisconsin north and westward. Uinta Mountains above 

 the head of Bear River; 12,000 feet altitude; August. (1,314.) 



PoA SEROTINA, Ehrh. Culms tufted, 18' high, smooth ; leaves narrowly 

 linear, scabrous ; ligules short ; panicle pyramidal, very loose and spreading, 

 3-8' long; branches in fives, capillary, a little scabrous; spikelets purplish, 

 3-4-flowered ; glumes acute, 1^" long ; lower palet slightly webbed at base, 

 1^" in length. — The same as 672 Hall & Harbour from Colorado, (^namedby 

 Godet in letter to Dr. Gray, P. Hallii,) though with a larger and wider 

 panicle, and not differing from numerous specimens in Herb. Gray. This 

 species, as well as P. ccesia, Sm., is referred by Munro in Hooker's Arctic 

 Flora to P. ne?noraUs, L. From New England and Canada west to Wash- 

 ington Territory, northward to the Slave River and Behring Strait and 

 south to Colorado. On the Bear River in the Uintas ; 7,000 feet altitude ; 

 August. (1,315.)' 



PoA FLEXUOSA, Muhl. (1) From Virginia to Florida and west to Ken- 

 tucky ; specimens collected in the Wahsatch near Salt Lake City are referred 

 here, though of a somewhat different habit ; 6,000 feet altitude; May. (1,316.) 



PoA Eatoni. Allied to the last. Culms smooth, 1 J-2° high ; sheaths 



