324 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Second glume narrow, similar to the first, gradually nar- 
rowed to the acute apex. 
Rachilla copiously pilose, the hairs 2 mm. long; 
blades flat. 
Sheaths glabrous or scabrous...............-.-. 4. T. deyeurioides. 
Sheaths velvety-pubescent................... 5. 1. evolutum. 
Rachilla sparsely pilose, the hairs less than 1 mm. 
long. 
Apex of lemma with 4 slender teeth, ligule 
short; panicle open.................... 7. T. viride. 
Apex of lemma erose; ligule of upper leaf about 
4mm long; panicle rather narrow...... ‘6. T. palmer. 
1. Trisetum spicatum (L.) Richt. Pl. Eur. 1:59. 1890. 
Aira spicata L. Sp. Pl. 64. 1753. 
Type locality, ‘in Lapponie alpibus.”’ 
Rance: Arctic regions of the northern hemisphere, southward in the higher moun- 
tains to the southern hemisphere. 
HERBARIUM SPECIMENS FROM MExXICco: 
Jauisco: Nevado de Colima, summit, Hitchcock 7165; just above timber line, 
Mitchcock 7166. 
Hipauco: Sierra de Pachuca, Pringle 9603. 
México: Nevado de Toluca, Nelson 17; in the crater, Pringle 4303. Popoca- 
tepetl, woods, Hitchcock 5995,6009; Ross 1418; Rose & Hay 6299; Ixtaccihuatl, 
above timber line, Purpus 1617, 1643. 
Pursia: Mount Orizaba, Seaton 191; between timber and snow lines, Hitchcock 
6258; Rose & Hay 5734; Liebmann 604; alpine region, Ross 12700. Vaquerta 
del Jacal, Liebmann 605. Chinantla, Liebmann 606. 
2. Trisetum rosei Scribn. & Merr. Contr. U. S. Nat. Herb. 8: 289. 1905. 
Type locality, “‘Mount Popocatepetl, at an altitude of 3,600 meters,” the type 
specimen collected by Rose & Hay (no. 6016). 
Rance: High mountains of southern Mexico. 
HERBARIUM SPECIMENS: 
Hripaxco: Trinidad Iron Works, pine forests, Pringle 10032. Between Pachuca 
and Real del Monte, Rose, Painter & Rose 8686. 
M#xico: Popocatepetl, alpine region, Ross 1422; snow line, Purpus 5067, Rose & 
Hay 5979, 6016; black sand barrens, Hitchcock 5987. 
Pursia: Mount Orizaba, bald hill, Hitchcock 6252; open ground, Hitchcock 6261; 
Rose & Hay 6348. 
3. Trisetum californicum Vasey, U.S. Dept. Agr. Div. Bot. Bull. 12!: pl. 46. 1892. 
Type locality, ‘‘ Lower California near the boundary,’’ the above cited plate being 
drawn from the two specimens mentioned below. 
RanaeE: Known only from Lower California. 
HERBARIUM SPECIMENS: 
Lower Cauirornia: Northern Lower California, Orcutt 1431. San Ramén, Orcutt 
1437. 
4. Trisetum deyeuxioides (H. B. K.) Kunth, Rév. Gram. 1: 102. 1829. 
Avena deyeuxioides H. B. K. Nov. Gen. & Sp. 1: 147. 1816. 
Type locality, ‘‘in uliginosis temperatis ad ripam Lacus Tezcucensis” [Lake 
Texcoco, State of Mexico]. 
Range: Highlands, northern Mexico to Colombia, 
