13 



Muhlenber 



Stems 2-3 ft. high, stout and a little branched at very base. Leaves 

 Several, 1 2 dm. long, about 4 mm. wide at base, quickly acumi- 

 nate, acute, flat, thick. Ligule short. Panicle 1-1 .5 ft. long, of very 

 many single capillary and ascending rays 5-8 cm. long, the lower 

 third without flowers, the rest of each ray with 10-20 florets close- 

 ly appressed and racemose on pedicels about 1 mm. long. Glumes 

 about f the lemma, the lower lanceolate, the upper oblong, about 

 equal. Lemma linear-elliptical, barely acute, scabrous, mostly with 

 a purple blotch, 3 mm. long, yellowish like the glumes Awn a 

 mere mucro or \ mm. long. This is allied to M. flavida Vasey. 

 Guayanopa canon Sierra Madre Mts. Chihuahua Mexico, Lower 

 Temperate Life Zone, Sept. 23 1903. No. 7316. 



Agrostis filiculmis n. sp. 



Stems tufted, erect, about 1 mm. thick, 2 ft. high, about 4-leaved, 

 the internodes longer than the narrow sheaths. Ligule 2 mm. long 

 and acuminate. Leaves about 1 dm. long and 1 mm. wide, ap- 

 pressed, the root leaves very short. Panicle about 5 cm. long, few 

 flowered. Rays very unequal, capillary, flexuous, the longest rare- 

 ly 2 cm. long, appressed, racemosely few-flowered above the mid- 

 dle. Pedicels similar, appressed, shorter than the spikelets. The 

 glumes 2 mm. long, acuminate-lanceolate, slightly unequal, aris- 

 tate, nearly smooth except for a few short teeth on the nerve*. 

 Lemma about f as long, very thin, oblong-ovate, acute, with a 

 very slender awn attached at the middle and slightly exceeding 

 the lemma tip. Plants very closely resembling Oryzopsis micran* 

 tha. Little De Motte Park on the liaibab in northern Arizona, 

 Upper Temperate Life Zone, on gravelly mesas, in the fall of 1S94. 



Bouteloua aristidoides var. Arizonica n. var. 



Spikelets about 10-flowcred, 2 cm long Rachis not longer than 

 the last floret. Tucson Arizona, Thornber, No. 1??. 



POA 



Because of the hopeless way in which the species of Poa are, 

 by Vasey, Scribner, Rydbergand some others the writer has dread- 

 ed to take it up, but a proper regard f«»r certain characters and 

 ignoring trivial ones brings some order out of the chaos, though 

 a person cannot untangle all the knots without visit ; ng all locali- 

 ties at least twice with Poa particularly in mind. 1 have visited 

 nearly every region exceqt the Saskatchewan, and most of them 

 several times. I know the ecological condition under which these 

 plants grow. I make the following changes and suggestions. 



