AGKOSTIDE.E. 325 



111 carefully raising seedlings of many typical awned specimens 

 of A. canina. Dr. Jenkins, of Connecticut, found that only a small 

 per cent of them possessed awns. This being the case, what hin- 

 ders uniting A. vulgaris with A. canina ? I leave them as others 

 have left them, thinking it best to give the subject further atten- 

 tion before uniting them. 



f). A. setifolia Fourn. Ileinsl. Biol. Centr. Am. Bot. 3:551 

 (1880). 



A tufted erect perennial, 40-60 cm. high. Leaves of sterile 

 shoots few, those of the culm 3, ligule decurrent, 1-2 mm. long; 

 blades strict, filiform, involute, scabrous, 20-25 cm. long. Panicle 

 thin, ovoid, purplish, 10-14 cm. long; rays in twos, threes, and 

 fives, the longest 5-G cm. long, bearing a few spikelets on the outer 

 two-fifths. Spikelets 3 mm. long; empty glumes subequal, ellip- 

 tical-lanceolate when spread; floral glume 2.2 mm. long, tiancate, 

 with 5 excurreiit nerves, the twisted and bent awn projecting 3 mm. 

 above its glume ; palea 0. Very closely related to A. canina and 

 perhaps merely a variety of that species. 



Found at an altitude of 10,000 feet. 



Mexico (Oaxaca), Pringle 4895. 



7. A. inflata Scribn. ined. 



A dwarf perennial, 4-10 cm. high. Sheaths smooth, the upper 

 inflated; ligule about 1 mm. long; blades erect, flat, pungent- 

 pointed, 2-5 cm. long, 2-3 mm. wide. Panicle partially included, 

 spikelike, 1.5-5 cm. long, 4-6 mm. diani. Spikelets 2.5 mm. long; 

 empty glumes equal or subequal, each bearing a short bristle; floral 

 glume 1.6 mm. long, with a very few short hairs at the base, broad, 

 truncate, 4-toothed, 5-nerved below, the awn attached near the 

 middle and about 4 mm. long; palea 0. 



British Columbia (Vancouver Island), Macoun 258 in 1893. 



8. A. microphylla Steud.. Syn. PL Gram. 164 (1855). 

 Annual; culms erect, 30-70 cm. high. Sheaths smooth or 



scabrid, shorter than the internodes; ligule decurrent, 3-5 mm. 

 long; blades erect, flat or involute, scabrous, 6-20 cm. long, 3-4 mm. 

 wide ; blades of sterile shoots shorter and narrower. Panicle much 

 «xserted, erect, dense, interrupted, jiale green and tinged with 



