532 Rydberg : Rocky Mountain flora 



and the shorter rachilla, which is barely one third as long as the 

 flower. 



British Columbia : Yoho Valley, Sept. 6, igo^,jolin Macoun 

 64787 (type, in herb. N. Y. Bot. Gard.) ; also 647S8 ; Selkirk 

 Mountains, 1904, C. H. SJiaiv 424; Roger's Pass, July 31, 1890, 

 John Maccmn. 



Agrostis Bakeri sp. nov. 



A cespitose perennial ; stem about 3 dm. high, erect, slightly 

 geniculate below, glabrous ; basal leaves numerous ; sheaths close, 

 slightly scabrous, those of the stem-leaves often shorter than the 

 internodes, ligules ovate, 2 mm. long, dentate ; leaf-blades flat, 

 1-2 mm. wide, 5-10 cm. long ; panicle ovoid, 8-10 cm. long, open ; 

 branches ascending, branched above the middle, the lower 3-5 

 cm. long ; pedicels somewhat scabrous, thickened below the 

 spikelets ; empty glumes nearly equal, purple, 2-2.5 "^rn- long* 

 acuminate ; flowering glume three fourths as long, obtuse, bearing 

 above the middle a dorsal straight awn a little exceeding the 

 glume ; palet none or minute. 



The type specimen of this species was determined as A. tenuis 

 erccta by Professor Scribner and included by Professor Hitchcock 

 in A. idahoensis (the latter united A. idalwensis Nash and A. tenuis 

 Vasey). Professor Hitchcock remarked that Baker's )io. ij^o "is 

 yet more robust and there is a short straight awn on the flowering 

 glume." These are the essential characters by which it is to be 

 separated from A. idalwensis. The empty glumes are also larger 

 and more acuminate. One of the other specimens referred to 

 Agrostis Bakeri, viz. )w. jy, was included in A. hieinalis geniinata 

 by Hitchcock. Of this he remarked that it has "the awn but a 

 more diffuse panicle." It is evident that Baker's no. jy and no. 

 150 belong to the same species, the former being younger and 

 less well developed. Agrostis Bakeri is most closely related 

 to A. geniinata Trin., differing in the broader leaves, ascending in- 

 stead of divaricate branches of the panicle, smaller spikelets, and 

 shorter awns. In A. geininata the basal leaves are filiform and 

 involute, the spikelets about 3 mm. long and the awn equaling the 

 empty glumes. A. Bakeri grows in the mountains at an altitude 

 of 3000-3200 m. 



Colorado: Near Pagosa Peak, August, 1899, C. F. Baker 

 ijo (type, in herb. N. Y. Bot. Gard.) ; >io. j/ and no. 1.48. 



