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



Lemma minutely ciliate on the nerves or glabrous, the spikes not feathery. 

 Awn of fertile lemma usually 3 to 6 mm long; spikes mostly 7 to 12 cm 



long, the spikelets not closely crowded 12. C. verticillata. 



Awn of fertile lemma usually less than 3 mm long; spikes usually less than 

 6 cm long, the spikelets crowded. 

 Awns about 1 mm long; rudiment prominent, inflated, broadly triangular- 

 truncate, about 1.5 mm wide as folded at summit. 



15. C. CTJCTJLLATA. 



Awns 2 to 3 mm long; rudiment not inflated, not more than 1 mm wide 

 as folded at summit. 

 Rudiment oblong-cuneate, about 0.6 mm wide as folded at summit. 



13. C. SUBDOLICHOSTACHYA. 



Rudiment triangular-truncate, about 1 mm wide as folded at summit. 



14. C. LATISQTJAMEA. 



Figure 10G0.— Chloris glauca. Plant, X 1; florets, X 5. (Combs and Baker 1143, Fla.) 



Section 1. Eustachys (Desv.) Reichenb. 



Lemmas firm, brown to blackish, awnless or mucronate only; glumes 

 scabrous, the second mucronate from a notched or truncate 

 summit. Perennials. 



1. Chloris glauca (Chapm.) Wood. (Fig. 1060.) Glaucous; culms 

 erect, compressed, stout, 70 to 150 cm tall; basal sheaths several, 

 broad, compressed, keeled, overlapping and equitant, those of the 

 succeeding 1 or 2 distant nodes similar, 2 to 4 leaves aggregate; 



