396 CONTRIBUTIONS "ROM THE NATIONAL HERBARIUM. 
ment, this in the proximal spikelet very much reduced; first glume 5 mm., the second 
6mm, long, scabrous-keeled; lemma 6 to 7 mm. long, 3-awned, the central awn about 
1 mm. longer than the lateral, smooth, the awns scabrous; palet 2-awned, smooth, the 
awns scabrous; rudiment consisting of a staminate floret, the lemma bearing 3 long, 
scabrous awns, about 11 mm, long, lateral awns about 2 mm. shorter; palet similar to 
but smaller than that of the perfect floret; caryopsis cylindrical-ovate, 4 mm. long, 
0.75 mm, wide, the large scutellum three-fourths the length of the entire caryopsis or 
more. (FIGURE 48.) 
The type specimens furnish most of the knowledge which we have of this species, 
which grows upon rocky ridges on the Pacific coast of the State of Sonora, Mexico. 
It is very distinct from any of the other species. It resembles B. aristidoides in general 
habit but is a coarser, more leafy plant, and the spikes are more like those of B. texana. 
Judging from the material in the National Herbarium this should be found com- 
monly on the Pacific coast of Mexico, south from the State of Sonora. Besides the 
type specimens there is one collected by Earl Flint in Granada, Nicaragua, in Febru- 
ary, 1868, which is at least very close to this species. Confirmatory material from 
Nicaragua is necessary. 
19. Bouteloua aristidoides (H. B. K.) Griseb. 
Dinebra aristidoides H. B. K. Noy. Gen. & Sp. 1: 171. 1816. The plate of this @ in 
a later volume identifies the species without doubt. 
Atheropogon aristidoides Roem. & Schult. Syst. Veg. 2: 415.1817. Based upon 
Dinebra aristidoides H.B.K. See also Spreng. Syst. Veg. 1: 293. 1825; Fourn. Mex. 
PI. 2: 139. 1881, . 
Eutriana aristidoides Trin. Gram, Unifl, 242. 1824. Based upon Atheropogon aristi- 
doides H. B. K. See also Steud. Syn. Pl. Glum. 1: 216. 1854. 
Dineba hirsuta Presl, Rel. Haenk. 1: 292. 1830. The type specimen is in the her- 
barium of the National Museum at Prague. 
Eutriana ? hirsuta Kunth, Enum. Pl. 1: 280. 1833. Based upon Dineba hirsuta 
Presl. 
Aristida unilateralis Willd.; Steud. Nom. Bot. ed. 2. 1: 132. 1840. A herbarium 
name of Willdenow published as a synonym of Eutriana aristidoides. 
Bouteloua aristidoides Griseb. Fl. Brit. W. Ind. 537. 1864. Based on Dinebra aristi- 
doides H. B, K. See also U. 8. Dept. Agr. Div. Bot. Bull. 12 !: pl. 35. 1890; U.S. 
Dept. Agr. Div. Agrost. Bull. '7: 214. f. 196, 1897. 
Bouteloua gracilis Hook.?; Vasey in Wheeler, Rep. U.S. Surv. 100th Merid. 6 : 287, 
1878, not Lag. 1840. The type is Rothrock’s no. 701. 
Bouteloua ciliata Griseb. Abh. Ges. Wiss. Géttingen 19: 302. 1879 (Symb. FI. 
Argent.). The type specimen, Lorenz & Hieronymus 352, from Juramento, Argentina, 
is in the Grisebach Herbarium. 
Triathera aristidoides Nash in Small, Fl. Southeast. U. S. 137. 1903. 
DESCRIPTION. 
A tufted, erect or decumbent, smooth annual, with unright or geniculate culms, 
altogether too variable in size to permit of the preparation of lineal descriptions of any 
value; sheaths loose, especially on branching culms, striate, the lower one-third to 
one-half the length of the internode, the upper sometimes nearly as long, this depend- 
ing upon the character of the season; ligule reduced to a membranaceous line or 
slightly fimbriate, with a few scattered hairs; blades small, few, 2 to 7 cm. long, with 
a few scattered hairs on the upper surface; panicle variable, 2 to 7 or 8 cm. long, but 
often in vigorous plants 15 cm. long, bearing normally 10 to 14 spikes, but under 
4 Op. cit. 7: pl. 695. 1825, 
