366 POACEiE. 



rays capillary in twos, bearing the spikelets near tlie tips. Spike- 

 lets with the awns usiuilly protruding one-third of their length; 

 empty glumes thinner than the floral glume, ovate-lanceolate, first 

 3.5 mm. long, 1-nervod, second 4.5 mm. long, 3-nerved, the lateral 

 nerves short and sometimes obscure or wanting; florets 4 or more 

 mm. long, overlapping for five-sixths of their length, sparingly 

 sili<y-hairy at the base; floral gUime ovate, 5-nerved, eroded or 

 toothed, awn starting about I mm. above the base; palea as long as 

 its ghinie, or longer or shorter. Grain not grooved, free. 



Mt. Washington, D. C. Eaton; Massachusetts, Heal 81; New 

 Jersey, Scribtier for U. S. Dept. Agricul. 400; Xew York, Clark 

 1302 from Clinton; Michigan Isle Koyale, Uobbitis 75"*; Colorado, 

 BramU'nee. 



New El' .ji id, Michigan, to the south and west; northern 

 Europe and Asia. 



4. D. atropurpurea (Wahl.) Scheele, Flora (27) 1: 56 (1844). 

 Aira att-upurpurea Wahl. Fl. Lapp. 37 (1812). D. htlifoUa 

 Vasey, Cat. Gr. U. S. 53 (1885). 



A smootli perennial, 20-40 cm. high. Leaves 3-4; slieaths 

 as long as the internodcs, shorter or longer; oblique at tlie throat; 

 ligule obtuse, 3-3 mm. long; blades flat, those of the sterile 

 shoots 4-15 cm. long, those of the culms 2-0 cm. long, 3-G mm. 

 wide. Panicle simple, open, more or less exserted, 5-11 cm. long, 

 rays in pairs, spreading, the longest 4-8 cm. long, bearing 5-10 

 spikelets near the apex. Spikelets mostly pedicellate, a few subses- 

 sile, often purple; empty glumes compressed. sube(|Uiil, first shorter, 

 linear-lanceolate, 1-nerved. 4.7-0 mm. long, second ovate-lanceo- 

 late, ;5-nerved, 5-6 mm. long; florets overlapping for one-third to 

 one-half their length; rachilla above the upjutr floret about 0.6 mm. 

 long; floral glume 2.3-2.7 mm. long, the silky hairs reaching to 

 the middle or above, the stout awn attached a little above the mid- 

 dle, 2.5-4.5 mm. long, broadly oval, truncate, silky, irregularly 3-4- 

 tootlied, obscurely 5-nerved; palea as long as its glume, or a little 

 shorter, truncate or irregularly toothed. 



Labrador, A. A. Allen; White Mountains, Tuckerman, Oakes, 

 C. E. Faxon; British Columbia, Macoun. 



