CHLORIDE.E. 405 



nerves 2.5 mm. long, the awn 2-3.5 mm. long; rudimentary floret 

 1.3 mm. long, bearing an awn about its own length. 



Florida (southern part), J. H. Simpson for U. S. Nat. Herb. ; 

 also found in AVest Indies and Brazil. 



3. C. verticillata Nutt. Trans. Am. Phil. Soc. (II.) 5:150 

 (1833-3r). 



Culms 20-30 cm. high. Ligule a fringe of short hairs; blades 

 rough, abruptly pointed, conduplicate, 3-9 cm. long, the upper 

 shorter, 3-4 mm. wide. Spikes 9-12 in number, 4-8 cm. long, the 

 lowest in whorls, purple, a middle internode of a spike about 15 mm. 

 long. Empty glumes narrow, membranous, 1-nerved, toothed, first 

 2 mm. long, including the short awn, second over 2 mm. long besides 

 the short awn; floret 2.3-2.7 mm. long; floral glume compressed, 

 broadly oval when open, sliort-ciliate on the margins, emarginate, 

 awn 3-4 mm. long; palea narrowly ellij^tical, emarginate, ciliate on 

 the keels; empty glumes above the floret mostly excluded from the 

 floral glume, obovate, truncate, 3-nerved, 1.5 mm. long, awned, some- 

 times a second rudiment above. Grain elliptical, flat, triquetrous. 



Texas, E. Hall 7T3, Eeverchon, NeaUey, Curtiss 23, 3440.* 



4. C. longifolia (Fourn.) Vasey, Contrib. U. S. Nat. Herb. 1: 

 284 (1893). Gyinnogogon longifolius Fourn.; Hemsl. Biol. Centr. 

 Am. Bot. 3:560 (1880). 



A rather stout caespitose grass, 60-100 cm. high, bearing fertile 

 spikelets on panicles of two sorts, one in the soil among the roots or 

 just above the surface, the other at the apex of the culms or in tlie 

 axils of the upper leaves. Sheaths mostly longer than the inter- 

 nodes; ligule very short, ciliate; blades smooth excepting near 

 the auriculate base, flat, 15-25 cm. long, 5-8 mm. wide. The 

 upper panicle 10-20 cm. long of 5-10 racemose spikes. Spikes 

 mostly in three sets of three each, 8-16 cm. long, flower-bearing 

 for the whole length. Spikelets 1-2-flowered ; first empty glume 

 0.7 mm. long, second twice as long; floral glume linear with a short 

 hairy callus at the base, 5-7 mm. long, scabrid on the 3 nerves 

 and margins, 2-toothed, awn back of the teeth, 6-10 mm. long; 

 palea as long as its glume, terminating in 2 slender teeth ; second 

 floret imperfect, borne on a pedicel 2 mm. long, its awn about 



