Bent-grass Tribe 29 



scabrous on the keel, about as long as the second glume ; central 

 awn shorter to a little longer than its glume, the lateral ones a, 

 little shorter, all scabrous; palea less than 1 mm. long. 



Occasional in dry open places in the chaparral belt about Pasadena and 

 San Diego; Catalina Island. 



2. A. purpurea aequiramea (Schule) Merrill. Rather stout r 

 tufted, glabrous, 3-6 dm. high; culms simple; sheaths longer 

 than the internodes, pilose at the throat; leaves involute, the 

 lower numerous, 3-10 cm. long, 1-2 mm. wide, those of the culm 

 about 3, usually 3-4 cm. long; panicle purplish, the branches 

 capillary, generally erect or ascending, usually many-flowered, 

 3-5 at each node; spikelets pale or purplish; second empty 

 glume twice as long as the first, equaling the flowering glume, 

 both cleft at the apex, the midnerve excurrent as a scabrous awn, 

 1-2 mm. long; flowering glume about 10 mm. long, strongly 

 tuberculate-scabrous ; awns equal, 5-7 cm. long. (A. purpurea- 

 Calif arnica Vasey.) 



Occasional in the lower altitudes of the chaparral belt. 



10. STIPA L. FEATHER-GRASS. 



Generally rather tall grasses with convolute, rarely 

 flat leaves and paniculate inflorescence. Spikelets 1- 

 flowered, narrow. Glumes 3, the outer 2 narrow acute 

 or rarely bearing an awn, the third rigid convolute with 

 a hairy callus at the base and bearing a more or less 

 bent awn, which is spiral at the base and articulated to 

 the glume. Stamens 3, rarely fewer. Styles short, dis- 

 tinct. Grain narrow free, tightly enclosed in the glume. 



*Awn scabrous or nearly smooth. 



1. S. Hassei Vasey. Culms slender and wiry, tufted, more or 

 less branching below, erect, 3-4 dm. high ; leaves very narrowly 

 linear, setaceous, 1-2 dm. long, erect; ligule minute; sheaths 

 narrow, striated; panicle 5-7.5 cm. long, narrow, loose, erect ; 

 branches erect, mostly 2-3 together, the larger ones 25 mm. long 

 or more, naked below, others flowering to the base; spikelets 

 small; empty glumes narrowly linear-lanceolate, acuminate, 

 about 5 mm. long, nearly equal ; flowering glume nearly as long as 



