GRIFFITHS—THE GRAMA GRASSES. 363 
the third floret when present bearing equal awns, the lemma being very deeply lobed 
and cut, the lateral awns appearing almost separated; palet plicate, very shortly 
2-awned; caryopsis obovate, 1.5 to 2 mm. long, with conspicuous embryo and scutel- 
lum covering practically the entire ventral surface. (FIGURE 26.) 
The species is very abundant in the canyon of Tomellin, where it constitutes the 
main pasturage over extensive areas and whence it extends to the valley of Oaxaca, 
It makes a semblance of a turf in places and in habit very closely resembles Hilaria 
cenchroides. 
Fic. 26.— Cathestecum stoloniferum. a, Uppermost spikelet; b,c, lemma and palet of first floret; 
d, e, lemma and palet of second floret; f, g, lemma and palet of third floret; h, i, lemma and 
palet of fourth floret; j, k, two views of caryopsis; /, one of lower pair of spikelets. a-i, Scale 
7.53}, k, scale 10; 1, scale 7.5. From Griffiths 8122. 
The only specimen referred here, aside from collections by myself and Hitchcock 
listed elsewhere,? is no, 958, collected by C. L. Smith at San Antonio, valley of Oax- 
aca, Mexico. 
BOUTELOUA Lag. 
Botelua Lag. Var. Cienc, 24: 134, 1805. Based upon B. racemosa. 
Atheropogon Muhl.; Willd. Sp. Pl. 4: 937. 1806. Based upon A. apludioides. 
Triathera Desy. Nouv. Bull. Soc. Philom. Paris 2:188. 1810. Based on Aristida 
americana. 
Heterosteca Desv. Nouv. Bull. Soc. Philom. Paris 2: 188. 1810. Based upon H. 
juncifolia from ‘‘Antillis.”” See also H. B. K. Nov. Gen. & Sp. 1: 173. pl. 54. 1816. 
The name is written by Kunth® “ Heterostega,” and by Hooker¢ “ Heterostegon.”” 
a See page 425. 
b Mém, Mus. Hist. Nat. 2: 73. 1815. 
c¢ Trans, Linn. Soc. Bot. 20: 175. 1847. 
