470 NoTreworTHY NorTH AMERICAN GRASSES 
planifolium to which it is not closely related. Its distinguishing 
characters are its habit of growth, lanceolate empty glumes, 
glabrous flowering glumes, and prominent cartilaginous leaf- 
margins. 
Trisetum Congdoni sp. nov. 
A caespitose, erect, rigid perennial 2-3 dm. high, with erect 
or ascending rigid leaves, and exserted, ovate, densely-flowered 
panicles 4-5 cm. long, 1.5 cm. in diameter. Culms minutely 
puberulent. Ligule ovate, hyaline, 2-3 mm. long; leaf blades 
4-5 cm. long, 2~3 mm. wide, glabrous beneath, scabrous above, 
flat or somewhat involute toward the apex. Panicles slightly 
purplish, common axis pubescent, the short branches densely 
flowered, spikelets mostly 2-flowered ; empty glumes narrowly 
lanceolate, glabrous except on the scabrous keels, acuminate, 
I-nerved, the first about 6 mm. long, the second 8 mm. long; 
flowering glumes 6 mm. long, very strongly scabrous through- 
out, lanceolate, acuminate, cleft at the apex, and terminating 1 
two slender teeth about 1 mm. long; awn inserted somewhat 
above the middle, spreading, scabrous, 7-8 mm. long. Palea 
equaling the glume. 
Type specimen collected by J. W. Congdon, Shadow Lake 
Trail, Mariposa county, California, 1899. 
This species is readily distinguished from forms of Trisetum 
subspicatum by its rigid leaves, peculiar panicles, narrow empty 
glumes, very scabrous longer flowering glumes and longer awns. 
