24 



Imperata, Cyr. 



Inflorescence densely spicate or in a spike-like panicle, the spike- 

 lets usually in pairs, one sessile and the other pediceled along the 

 slender rhachis of the short branches of the panicle, with long silky 

 hairs at the base and on the outer glumes. Spikelets with one per- 

 fect and one neutral flower, the outer glumes thin, nearly equal, 

 silky : the flowering glumes smooth and hyaline ; palet usually trnn- 

 cate and jagged at the top. Stamens 1 or 2, styles 2. 



1. I. Brasiliensis, TV in. (I. caudata, Chap.) Florida. 



2. I. brevifolia, Vasey. (I. arundinacea, authors.) West Texas to 



California. 



Erianthus, Miehx. 



Panicle terminal, dense and woolly, or lax, with the branches dis- 

 tant. Spikelets one-flowered, in pairs at the joints of the slender 

 branches, one sessile, the other pedicelled, otherwise both alike. 

 Glumes 4, the V outer nearly equal, 5-nerved, thick, the third glume 

 smaller, thin, and hyaline, the fourth thin, slender, mostly bifid, ter- 

 minated by a slender, rigid awn, and enclosing the stamens and 

 style. In addition there are two lodicules or scales at the base of 

 the last (upper) glume. There is a tuft of long silky hairs at the 

 base of each spikelet, except in E. sstnctus. No true palet present. 



1. E. brevibarbis, Jlichx. Virginia to Texas. 



2. E. contortus, Ell. North Carolina to Texas. 



3. E. saccharoides, Jlichx. (E. alopecuroides, Ell.) Maryland to 



Texas. 



4. E. strictns, Baldw. North Carolina, Tennessee to Texas. 



EuoxuRrs, H. S. K. 



Flowers in narrow cylindrical spikes, the spikelets in pairs, (one 

 sessile and one pedicelled,) at each alternate joint of the grooved 

 rhachis, the sessile spikelet with one perfect flower, the pedicelled 

 one sterile. Glumes 4, all awnless, the lower one usually the largest 

 and thickest, the 2d rather smaller and thinner, the 3d and 4th hya- 

 line; the true palet generally wanting. Stamens 3, style distinct, 

 stigmas plumose. 



1. E. candidus, Hack. ( Andropogon candidus, Trin.) Texas to 

 Arizona. 



