290 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Glumes or at least one of them as long 
as the body of the lemma. 
Glumes villous.................... 46. M. speciosa. 
Glumes not villous. 
Spikelets about 2 mm. long. 
Ligule less than 5 mm. long; 
throat villous; blades 4 to 
5mm. wide..........-..... 49. M. grandis. 
Ligule conspicuous, 1 cm. long 
or more; throat not villous; 
blades 1 to 2mm. wide.... 47. M. distichophylla. 
Spikelets more than 2 mm. long, 
Glumes unequal, the first half as 
long as the second; lemma 
villous. ................-- 50. M. virescens. 
Glumes about equal. 
Blades flat; glumes obtuse or 
acutish...... wee e eee eeee 48. M. vaseyana. 
Blades involute, or very nar- 
row. 
Blades smooth on the lower 
surface............... 51. M. articulata. 
Blades very scabrous. 
Basal sheaths not strap- 
shaped............. 52. M. longiglumis. 
Basal sheaths. strap- 
shaped............. 53. iM. straminea. 
1. Muhlenbergia texana Buckl. Proc. Acad. Phila. 1862: 91. 1863. 
Sporobolus annuus Vasey, Bull. Torrey Club 14: 9. 1887. 
Muhlenbergia buckleyana Scribn. Contr. U. S. Nat. Herb. 1: 56. 1890. 
Type locality, ‘Northern Texas.”’ 
RanGE: Texas and Arizona to Durango and Lower California. 
HERBARIUM SPECIMENS FROM MExIco: 
Lower CauirorniA: Sierra de San Francisquito, Brandegee in 1899. 
CuiguanuaA: Chihuahua, wet ledges, rocky hills, Pringle 399; on gravel bars of 
streams, rocky hills, Pringle 400. Mifiaca, in bed of rocky run, Hitchcock 
7768. Sanchez, open ground in pine woods, Hitchcock 76644. Noragachie, 
Palmer 3d in 1885, 
Durango: Sandfas Station, barranca, Pringle 13629. Dos Cajetes, among thickets, 
Palmer 797 in 1896. 
2. Muhlenbergia flavida Vasey, Contr. U. 8. Nat. Herb. 1: 282. 1893. 
Type locality, ‘‘Rio Blanco,’’ the type specimen collected by Palmer (no. 645). 
RanGE: Highlands from northern to central Mexico. 
HERBARIUM SPECIMENS: 
Curmuanua: Sierra Madre, wet places, Pringle 3034. Guayanopa Canyon, Jones 
7316. 
Jauisco: Rio Blanco, Palmer 645 in 1886. Guadalajara, ravines, Pringle 11749. 
Hrpaueo: Canales Station, bogs, Pringle 8951. 
2a. Muhlenbergia flavida strictior Scribn.; Beal, Grasses N. Amer. 2: 263. 1896. 
Muhlenbergia strictior Scribn.; Beal, Grasses N. Amer. 2: 263. 1896. 
Type locality, “Mexico,” the type specimen collected in the Sierra Madre by 
Pringle (no. 1418). 
