12 



Muhlenbergia brevifolia (Nutt.). 



Agrostis brevifolia Nutt. Gen. 1 i4. Sporobolns cuspidatua Wood. 



Muhlenbergia brevifolia var. Richardsonis (Trin.). 

 Vilfa Richardsonis Trin. Mem. Acad Pet. 5 2 103. V. depaupera- 

 te Torr. 



Muhlenbergia filiculmis (Thurber). 



Vilfa filiculmis Thurber in lieal dr. % 288. M. Thurberi Rydberg. 



Muhlenbergia Metcalfi n. sp. 



Allied to M. parvigluruis. Stein slender. Ligule elongated, lacerate, 

 with thread-like tip. Leaves very acute, the root leaves about 1 

 dm. long, the several .stem leave* 5-8 cm. long , loosely involute, a- 

 bout 1 mm. wide. Sheaths close, a little shorter than the lower in- 

 terludes, but longer above, with a light colored ring at the ligule. 

 Panicle ex serted, loose, linear. 1-2 dm. long, strict, acuminate. 

 Rays in twos and threes, very delicate and capillary, bare on the 

 lower fourth, then race mosely one to few flowered, the whole rare- 

 ly 3 cm long, all closely appressed. Lateral spikelets on delicate 

 pedicels rarely half as long as lemma, the many terminal ^pikelets 

 ' on p. dieles twice as long Glumes about equal, 2 mm long, nar- 

 rowly obl<mg, purplish with hyaline margins. Lemma yellowish, 

 linear lanceolate, nearly 4 mm. long, purple-ribbed above, with 

 only a minute tuft of hairs at very base, abruptly contracted in- 

 to a very delicate awn 5-8 mm. long. No. 1485 Metcalf, Santa Ri- 

 ta Mt Grant Co. New Mex., on rocky slopes at 7,000 ft. alt, Low- 

 it Temperate Life Zone probably. 



The following two species have yellow or yellowish panicles. 

 Awns not longer than the lemma. Upper glumes with short teeth 

 on each side of the produced midrib, slightly awned. Annuals 

 with simple stems. 



Muhlenbergia Madrensis n. sp. 



Stems weak, filiform, almost capillary, ascending, about 2 dm. 

 long. Leaves thin, flat, about 1 mm. wide, 1-3 cm. long, obtuse, 

 shorter than the somewhat enlarged sheaths which are rather loose 

 and the upper ones inclined to have a few flowers inclosed, much 

 shorter than the internodes. Ligule elongated. Panicle linear, a- 

 bottt 5 cm long, few flowered, with florets closely appressed. Rays 

 single, very short, 1-3-flowered, appressed, sometimes remote, the 

 pedicels very short and with overlapping florets. Glumes about e- 

 qual, the lower ovate and acuminate, the upper oblong and about 

 half the lemma, light-yellow like the lemma, scabrous. Lemma 

 linear, elliptical, obtuse, 2- toothed, scabrous, about 4 mm. long. 

 in meadows, Round Valley near Garcia, Sierra Madre Mts. Chi- 

 huahua, Xo. 7:315, Sept. i\ 190J. 



