GRIFFITHS—THE GRAMA GRASSES. 371 
Puebla, and Lloyd 105, from Hacienda de la Cedros were placed with the Pringle col- 
lection. Later collections by myself, however, from the Valley of Mexico connect 
the small, narrow-leaved plants represented by Pringle 8820, with my large, compar- 
atively wide-leaved plant from Encinillas. The species appears to vary from the 
large plant described above to a diminutive plant often not over 7 or 8 cm. high, 
having narrow, rather rigid, mostly radical leaves. The smaller forms resemble B, 
procumbens except that they are perenrtial, while the larger ones look more like single- 
spiked plants of B. gracilis. 
The species has been collected at various places from northern Zacatecas to Orizaba 
and is especially abundant in the Valley of Mexico although not at all common in 
collections. Doubtless the common 
form of the Valley of Mexico may be 
found included with B. procumbens in 
some herbaria. 
5. Bouteloua hirticulmis Scribn. 
Bouteloua hirticulmis Scribn. U. S$. 
Dept. Agr. Div. Agrost. Cire. 80: 4. 
1901. The type is T. 8S. Brandegee’s 
no. 11, collected September 29, 1899, 
at Sierra de San Francisquito, Lower 
California. 
DESCRIPTION. 
A cespitose, erect, stout perennial, 
about 60 cm. high; culms simple, 
densely hirsute-pubescent below but 
naked above; sheaths short, striate, 
glabrous or with a few scattered hairs; 
ligule conspicuously  ciliate-hairy; 
blades 10 to 20 cm. long, flat, minutely 
scabrous, tubercular-hairy near base; 
spikes 2 or 3, apparently normally 2, 
about 5 cm. long, upon short, curved, 
woolly peduncles, the rachis projecting 
1 to 2 cm. beyond the distal spikelets; 
spikelets pectinate, numerous, 50 to 60, 
about 6 mm. long; glumes lanceolate, 
subulate-pointed, pubescent, the first 
2.5 to 3 mm. long, the second 5 to 
5.5 mm. long, the latter bearing upon the dorsal surface long papillose hairs, 1 to 3 mm. 
in length, much like those of B. hirsuta; lemma 3-lobed, with short awns from the 3 
nerves, the central lobe 1 to 1.5 mm. longer than the lateral pair, hairy, especially on 
the nerves; palet 2-nerved, awnless, glabrous, narrowly ovate, 4 to 5 mm. long; rudi- 
ment consisting of 3 scabrous awns, 3 to 4 mm. long, expanded and scale-like below, 
the central slightly the longest, interspersed with 2 or 3 scales on a naked stipe 1 to 1.5 
mm. long, bearing a few hairs at its apex; caryopsis not known. (F1GuRE 33.) 
This can be looked upon as a robust, hirsute, hairy-culmed form of B. hirsuta. Its 
tuberculate-hairy second glume and woolly culms are its distinguishing characteristics. 
Palmer’s no. 201, and Nelson’s no. 1259 are typical. Nelson’s no. 3121 (Roadside 
between Tuxtla and San Cristobal, Chiapas, Mexico, September, 1895, in U. 8. 
National Herbarium) includes B. hirsuta and B. hirticulmis mounted on the same 
sheet, indicating that the collector considered them the same species and probably 
ZEEE 
Fic. 33.—Bouleloua hirticulmis. a, Spikelet; b,c, lemma 
and palet of first floret; d, rudiment. a, Scale 7.5; 
b-d, scale 10. From type specimen. 
