POACEAE. 49 



Awns less than 7 mm, long. 12. B. marginatus. 



Awns more than 7 mm. long, 13. B. carinatus. 



1, B. trinii Desv, Annual; culms 3-6 dm, high, often branched 

 above, smooth or pubescent at the nodes; sheaths pilose-pubescent 

 or nearly smooth; leaves 6-15 cm, long, 3-5 mm, wide, usually 

 pilose-pubescent throughout or nearly smooth; panicle rather 

 crowded and narrow, suberect, 8-20 cm, long; branches slender, 

 ascending; spikelets lanceolate, 5-7-flowered, 1.5-2 cm, long; empty 

 glumes lanceolate, acuminate, smooth, the first 1-nerved, 8-11 mm. 

 long, the second broader, 3-nerved, 13-16 mm, long; flowering glume 

 coarsely and rather sparsely pubescent, 5-nerved, 12-15 mm, long, 

 acuminate, with 2 narrow teeth 2-3 mm. long; awn 15-20 mm. long, 

 twisted below, bent below the middle. (Trisetum barbatum Steud.) 



Occasional in the foothills and in the dry interior valleys. Pasa- 

 dena; Santa Ana Mountains; San Bernardino; San Diego. 



2, B. secalinus L. Annual; culms 3-7 dm. high, smooth through- 

 out or somewhat pubescent on the nodes; sheaths smooth or some- 

 times sparsely pilose-pubescent; leaves 1-2 dm, long, coarsely and 

 sparsely pubescent above, smooth beneath; panicle 8-18 cm, long, 

 erect, the upper part drooping in fruit; spikelets ovoid-lanceolate, 

 10-18 mm, long, 6-8 mm, wide in fruit; empty glumes smooth, 

 obtuse, the first 4-6 mm, long, 3-5-nerved, the second broader, 

 6-7 mm. long, 7-nerved; flowering glume 7-nerved, 6-8 mm, long, 

 elliptic, obtuse, smooth or scabrous; awn undulate, 3-5 mm, long; 

 palea equaling the glume. 



Los Angeles River, Davidson. 



3, B. hordeaceus L, Annual; culms erect, 2-8 dm, high, usually 

 pubescent at the nodes; sheaths retrorsely soft pilose-pubescent; 

 ligule 1,5-2 mm. long, laciniate; leaves linear, pilose-pubescent or 

 nearly smooth, 5-15 cm. long, 3-5 mm. wide; panicle contracted, 

 5-14 cm. long, 2-4 cm, wide; spikelets 5-13-flowered, 12-15 mm, 

 long, 4-6 mm, wide, ovate-lanceolate, becoming obtuse; empty 

 glumes coarsely pilose or scabrous-pubescent, the lower 3-5-nerved, 

 4-6 mm. long, the upper 5-7-nerved, 7-8 mm, long; flowering glume 

 8-9 mm, long, coarsely pilose or scabrous-pubescent; awn rather 

 stout, rough, straight or sometimes becoming twisted, 6-9 mm. 

 long. {B. mollis L.) 



Frequent along roadsides in coast valleys. Native of southern 

 Europe, 



4, B. madritensis L, Annual; culms 3-7 dm, high, smooth; 

 sheaths smooth or the lower sparsely pubescent; ligule about 2 

 mm, long; leaves linear, puberulent or nearly smooth, 5-15 cm, long, 

 2-4 mm, wide; panicle erect, 5-12 cm, long, lower branches 2-4, 

 1-3 cm, long, unequal, spreading in flower, slender; spikelets 3-4 

 cm. long, nearly smooth or scabrous-puberulent, 7-11-flowered; 

 empty glumes lanceolate, acuminate, the first 1-nerved, 9-12 mm. 

 long, the second 3-nerved, 13-16 mm. long; flowering glume linear- 

 lanceolate, 15-18 mm, long, glabrous or scabrous; awn stout, taper- 

 ing, rough, somewhat curved, 16-22 mm, long; palea pectinate- 

 ciliate on the keels, equaling the insertion of the awn, 



Santa Ana Mountains, on the Santiago Peak trail, altitude 3000 

 feet. 



