CATALOGUE. 281 



in a short, included peduncle; perigynia ovate, nerved, tapering to a cylin- 

 drical beak, with short teeth; bracts of female spikes evaginate, clasping, 

 or of the empty bract with a vagina 6" long, exceeding the culm; scales 

 3-nerved, purple, with pale margins and inidnerve, the male linear-oblong, 

 acutish, the female lanceolate, tapering to a sharp rough point, longer than 

 the perigynia. — Saguache Creek, Colorado, Wolf (1065). While the culm, 

 leaves, and male spikes in these specimens are fully developed, the female 

 spikes appear to have been arrested in their growth. In the disposition of 

 the spikes, they resemble aristata, but the short teeth of the perigynia 

 exclude them from that species. 



GRAMINE^. 



By GEOKGKE VASEY, M. D. 



Alopecueus akistulatus, Michx. — Twin Lakes, Colorado, 1873 (1073); 

 Santa Fe, N. Mex., 1 874 (32). Varies much in the length of the awn, which 

 is sometimes shorter, sometimes longer than the palet, — sometimes, indeed, 

 as in No. 390, Palmer, 1868, twice as long as the palet, in which case it 

 is hardly to be distinguished from A. geniculatus, L., of which it is consid- 

 ered a variety by Steudel. There is an equal variation in the stoutness of 

 the culm. 



Phleum alpinum, L. — Twin Lakes and South Park, Colorado, 1873 

 (1074). 



Hilaeia* cenchroides, H. B. K. — Culms stoloniferous, 1 foot or less 

 high, frequently rooting at the pubescent nodes; leaves flat, narrowly linear; 

 spike terminal; rachis flattened, flexuous, of 8-10 joints ; spikelets in threes, 

 which are connate at the base and alternate on the rachis. — Sanoita Valley, 

 Arizona (595). 



Vilfa cuspidata, Torr.— Twin Lakes, Colorado, 1873 (1075, 1076). 

 In some specimens, the glumes are acute and in others obtuse ; indeed, 



"Hilakia, H. B. K. — Panicle spike-like, spikelets sessile, in threes, which are connate at the base, 

 the two anterior ones male and from 1- to 3-flowered, the posterior female and 1-flo wered. Male flowers : 

 glumes 2, unequal, the lower one bifid and aristato, the upper one emaiginate and mucronate; palets 

 linear-oblong, emarginate and rounded at the apex, stamens 3. — Female flowers : glumes 2, opposite, 

 alike, unequally 2-lobed, aristate between the lobes; palets 2, expanded at the base, and abruptly nar- 

 rowed into a long neck, inferior one 3-nerved, superior one 2-nerved ; styles 2 ; grain oblong, compressed, 

 free between the 2 valves. 



