ACJHOSTIDE.E. 197 



the awns uud tlie twistod base separating by a joint from the 

 glume. 



Mussaeluisetts, A'. Fa.voii 'iO; New Jeriiey, /y^/ 37 ; Minnesota, 

 Ifolzitujer for Nat. Herb. 



Sandy soil. Eastern irassaclnisetts to Xew Jersey, also in Mex- 

 ico, Wisconsin, westward, and soutliward, 



3. A Californica Tliiirb. Boland. in Trans. Calif. Agr, iSoe. 

 134 (1SG4). A. Jonexii Vasey, C'ontrib. U. S. Nat. Herb. 3:48 

 (1S!»2). 



A slender densely tufted geniculate and niucli-branched grass, 

 often pubescent at the nodes. Siieaths loose, shorter than the 

 internodes, often jmbescent; ligule ciliate; blades smooth or sca- 

 brous below, involute-setaceous, those of the sterile shoots 3-('» cm. 

 long, those above shorter. Panicle racemose, few-tlowered. 3-<5 

 •cm. long, the lower spikelets in i)airs. Empty glumes 1-nerved. 

 first () mm. long, second 10 mm. long; floral glume minutely 

 scabrous, about the length of the first glume, often spotted; awns 

 united below from the joint upwards for neai'ly 10 mm. bearing 

 nearly ecpud spreading tii)S 2.5-5 cm. long. 



California. State Survvij 'I'll"! \ Arizona, ./owe*' 3895. 



Arizomi, California and Mexico. 



Var. fugitiva Vasey, Contrib. U. S. Xat. Herb. 3: 49 (1892). 



" DitTers from the type chiefly in the lower and more condensed 

 habit, and in the longer empty glumes." Vasey 1. c. 



Lower California, Palmer 501. 



Sand-beaches near the sea; seeds easily blown about ; spikelets 

 varying from greenish yellow to purple and brownish blai'k. 



4. A. spiciformis Ell. Bot. S. C. & (Ja. 1 : 141 (1810). 



Culms rigid, erect, sparingly branched, 30-00 cm. high. Sheatiis 

 shorter than the internodes: blades smooth, rigid, erect, involute, 

 those of the culm 2 in number. Panicle dense, spikelike, 15 cm. 

 long. Empty glumes narrow. 1-nerved; first 4 mm. long, with an 

 awn 10 mm. long; second 10 mm. long, witli an awn still longer; 

 floret slender and with its beak 3-3.5 cm. long, the awns diverging, 

 the central one stouter ami as long as the floral glume, the lateral 

 ones a little shorter. 



