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, 1904, /(?//;/ Macotin 

 6^y8j (type, in herb. N, Y. Bot. Gard.) ; also 64788 ; Selkirk 

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

 John MacoiuL 



Agrostis Bakeri sp. nov. 



A 



cespttose 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 low^er 3-5 

 cm. long ; pedicels somewhat scabrous, thickened below the 

 spikelets ; empty glumes nearly equal, purple, 2-2.5 ^^"i, 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. tentds 

 erecta by Professor Scribner and included by Professor Hitchcock 

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

 Vasey). Professor Hitchcock remarked that Baker's no, 1^0 ''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. idahoensis. The empty glumes are also larger 

 and more acuminate. One of the other specimens referred to 

 Agrostis Bakeri, viz. no. j/, was Included in A. hieinalis geminata 

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

 more diffuse panicle." It is evident that Baker's 710. jy and no. 

 J^o belong to the same species, the former being younger and 

 less well developed. Agrostis Baken is most closely related 

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

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

 shorter awns. In A. geminata 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. 



r 



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

 ISO (type, in herb. N. Y. Bot. Gard.) ; no. j7 and no. 148. 



