HITCHCOCK—-MEXICAN GRASSES. 303 
HERBARIUM SPECIMENS: 
CurnuaHua: Ledges, rocky hills near Chihuahua, Pringle 398. Southwestern 
Chihuahua, Palmer 159 in 1885. 
58. Muhlenbergia berlandieri Trin. Mém. Acad. St. Pétersb. VI. Sci. Nat. 413 
299. 1841. 
Type locality, ‘Mexico, in montibus,”’ the type specimen collected by Berlandier. 
Rance: Texas and New Mexico and south in the highlands to Oaxaca. 
HERBARIUM SPECIMENS FROM MEXICO: 
Sonora: Cananea, Ricketts 16. 
Duranco: Durango, abundant in a meadow, Palmer 729 in 1896. 
San Luis Porost: En route to Tampico, Palmer 954 in 1879. 
JaLisco: Road between Mezquitic and Monte Escobedo, Rose 2614. 
Hipa.co: Pachuca, rocky slopes, Purpus 1626; rocky hill, Hitchcock 67084. 
Mexico: Toluca, rocky hill, Hitchcock 6886. Federal District, Pringle 7376, 9591. 
Pursua: Chalchicomula, rocky hill, Hitchcock 6300, 6301. San Marcos, railway 
embankment, Hitchcock 6524; large clump, sandy soil, Hitchcock 6542. Espe- 
ranza, rocky hill, Hitchcock 6473. Cerros near San Luis, on rocks, Purpus 
2900. Hills about Contadero Station, Pringle 9590. 
Oaxac..: Sierra de San Felipe, Conzatti & Gonzdles 438a. 
64. TRINIOCHLOA gen. nov.! 
Spikelets 1-flowered, the rachilla not produced beyond the floret; glumes mem- 
branaceous, thin, and: papery; lemma narrow, rounded on the back, firmer than the 
glumes, bearing a stout, geniculate, dorsal awn attached above the middle, 2-toothed 
at the apex, the teeth slender, the callus densely bearded. Cespitose perennials with 
narrow, rather few-flowered panicles arfd spikelets as much as 1 cm, long excluding 
the awns.-—Mountainous regions, Sonora, Mexico, to Ecuador. 
Type species, Podosaemum stipoides H. B. K. 
KEY TO THE SPECIES. 
Glumes much shorter than the lemma. ....-.--.- cece cece eee eens 1. T. stipoides. 
Glumes about as long as the lemma. 
Blades very narrow, less than 1 mm. wide; glumes unequal, the 
second about 1 cm. long; ligule as much as 1 cm. long. ..-.... 2. T. micrantha. 
Blades 3 to 4 mm. wide; glumes nearly equal, the second 1.5 cm. 
long; ligule short.......-..------- 22 ee eee eee eee eee eee eee 3. T. laxa. 
1. Triniochloa stipoides (H. B. K.). 
Podosaemum stipoides H. B. K. Nov. Gen. & Sp. 1: 131. 1816. 
Muhlenbergia stipoides Kunth, Rév. Gram, 1: 64. 1829. 
Avena stipoides Scribn. U. 8. Dept. Agr. Div. Agrost. Cire. 19: 4. 1900. 
Type locality, ‘‘in planitie temperata amoena Llano de Cachapamba, juxta Chillo 
* * * (Regno Quitensi).”’ 
Rance: High mountains, southern Mexico to Ecuador. 
HERBARIUM SPECIMENS FROM MEXICO: 
México’ Ixtaccihuatl, hillsides, Purpus 1628; moist open woods, Purpus 1630. 
Pursia: Mount Orizaba, Liebmann 647. 
Moretos: Tres Marfas Mountains, Pringle 11754. 
Oaxaca: Sierra de San Felipe, Pringle 4905, Smith 923. 
1 This genus is dedicated to Karl Bernhard Trinius (1778-1844), the eminent agros- 
tologist, whose herbarium is at the Academy of Sciences of St. Petersburg. Trinia 
Hoffm. is a genus of Umbelliferae, and Triniusa Steud., based on Bromus danthoniae, 
is not a valid genus. It is but fitting that the name of Trinius should be borne by a 
genus of the family to the knowledge of which he contributed so largely. 
81544°—13——_9 
