370 POACE^. 



Smooth, 12-20 cm. high; panicle slender, few- flowered ; spike- 

 let about 5 mm. long. 



James Bay, Macoun 144; Colorado, Jo7ies 475. 



7. D. holciformis Presl, Reliq. Haenk. 1:251 (1830). Aira 

 holciformis Steud. Syn. PI. Gram. 221 (1855). 



A smooth perennial grass, 50-70 cm. high, the upper nodes 

 above the sheaths; ligule acute, 3 mm. long; blades scarcely 2 mm. 

 wide, the lower 40 cm. long, the upper 4-6 cm. long. Panicle 

 erect, interrupted, rather compact, 12-15 cm. long, about 2 cm. 

 broad, rays in fives or sixes, flower-bearing nearly to the base. 

 Spikelets 4.5-5.5 mm. long, florets overlapping for one-tJiird their 

 length, awns protruding about 1 mm., rachilla villous, rudiment 

 about two-thirds as long as the floret; empty glumes subequal, his- 

 pid on the nerves, about 5 mm. long, first linear, acute, 1-nerved, 

 second acute, narrowly obovate, 3-nerved; floral glume oblong, 

 5-uerved, 4 mm. long, 4-toothed, faintly hispid toward the apex, 

 awn nearly straight, starting at the middle of its glume; palea 

 oblong, as long as its glume, 4-toothed. 



California, Bolander 6071. 



8. D. calycina Presl, Reliq. Hsenk. 1:251 (1830). D. dantlio- 

 nioides Munro, Benth. PI. Hartw. 342 (1857). Aira danthoiniodes 

 Trin. Mem. Acad. St. Petersb. (VI.) 1: 57 (1830). 



Annual; glabrous, culms slender, 10-100 cm. high. Ligule 

 2-3 mm. long, acute; blades 1-5-10 cm. long, very narrow, often 

 exceeding the internodes. Panicle simple, spreading or narrow, 

 erect, rays 2-4, in half-whorls, naked below. Empty glumes oblong- 

 acute to linear-lanceolate, 3-nerved, first 5.5-7.5 mm. long, second 

 but little shorter, extending beyond the florets. The lower floret 

 reaching one-tliird onto the second; floral glume ovate, 2-2.5 mm. 

 long, minutely 4-toothed. 5-nerved, awn mostly extending beyond 

 the empty glumes; palea nearly as long as its glume, curved on the 

 back. Grain flattened, not grooved, straight next the floral glume, 

 curved next to the palea. 



Arizona, Lenimon; Washington, Brandec/ee 1175; Oregon, B. 

 Hall 664. 



This has been confounded with D. danthonioides Vasey, which 

 see. 



