588 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



Rachis velvety to villous; spikelets narrowly ovate 8. E. michauxii. 



Rachis scabrous only; spikelets lanceolate 7. E. punctata. 



Plants annual. 



Rachis scabrous only; racemes slender. Introduced 4. E. procera. 



Rachis pubescent; racemes stouter. 



Blades glabrous; fruit apiculate 5. E. gracilis. 



Blades pubescent; fruit with an awn about 1 mm. long 6. E. contract a. 



1. Eriochloa aristata Vasey. (Fig. 



846.) Annual; culms erect or spread- brous or scabrous; racemes several, 

 ing at base, 50 to 80 cm. tall; blades ascending, overlapping, 3 to 4 cm. 

 flat, mostly 10 to 12 mm. wide, gla- long, the rachis pilose, the pedicels 



bearing several long stiff hairs; spike- 

 lets about 5 mm. long, the glume and 

 sterile lemma tapering into awns (awn 

 of the glume about as long as the 

 spikelet), appressed-villous on the 

 lower half or two-thirds, the upper 

 part scaberulous only; fruit 3.5 mm. 

 long, apiculate. O — Open ground, 

 Arizona and California (near Yuma) ; 

 northern Mexico. 



2. Eriochloa sericea (Scheele) 

 Munro. (Fig. 847.) Perennial, in dense 

 tufts; culms simple, erect, 50 to 100 

 cm. tall, the lowermost sheaths felty- 

 pubescent; blades elongate, 2 to 3 

 mm. wide, flat or mostly involute, 



Figure 845. — Stenotaphrum secundatum. Plant, X 

 two views of spikelet, and fertile floret, X 10. 

 (Tracy 1408, Miss.) 





