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. 



Fig. 26.— Cathestecum stoloniferum. a, Uppermost spikelet; b, c, lemma and palet of first floret; 

 d, e, lemma and palet of second floret;/, g, lemma and palet of third floret; h, i, lemma and 

 palet of fourth floret; j, fc, two views of caryopsis; I, one of lower pair of spikelets. a-i, Scale 

 7.5; j, ft, scale 10; I, 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. 



BOTTTELOTJA Lag. 



Botelua Lag. Var. Cienc. 2 4 : 134. 1805. Based upon B. racemosa. 



AiheroppgonM-Vthl.] Willd. Sp. PL 4: 937. 1806. Based upon A. apludioides. 



Triathera Desv. 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. pi. 54. 1816. 

 The name is written by Kunth& " Heterostega, " and by Hooker "Heterostegon." 



a See page 425. 



b Mem. Mus. Hist. Nat. 2 : 73. 1815. 



c Trans. Linn. Soc. Bot. 20 : 175. 1847. 



