22. P. remotum, Remy. (P. pubifiornm, Hupt.) Alabama to 



Texas. 



23. P. setaceum, Michx. Massachusetts to Texas. 



24. P. vaginatnm, Swz. (P. reimarioides, Chapm.) Florida to 



Texas. 



25. P. virgatum, vai - . platyoxon, Doell. Texas. 



26. P. Walterianum, Schult. Southern States. 



Anth^enantia, JBeauv. 



Spikelets loosely raceoiose on the slender erect branches of the 

 lax, contracted panicle, containing one perfect terminal flower, and 

 one male or neuter one ; the outer, empty glumes hairy, 5 nerved, 

 equal, as long as or longer than the flower; perfect flower with 

 rigid, membranaceous glume and palet, (the apex soft,) the sterile 

 flower of a thin membranaceous palet. 



1. A. rufa, Benth. (Panicum rufnm, JTth.) Southern States. 



2. A. villosa, Beauv. (Panicum ignoratum, Kth.) Southern States- 



Amphicarpum, Kth. 



Spikelets of two kinds, those of the simple terminal panicle 

 generally perfect, but infertile ; the fertile ones borne singly at the 

 ends of subterranean runner-like pedicels, these much larger than 

 the others. The spikelets are one flowered, those of the panicle 

 with two nearly equal, smooth, pointed, membranaceous, 5-nerved 

 outer glumes; the flowering glume and palet rigid-membranaceous, 

 nearly as long as the outer glumes ; the spikelets of the runners 

 have thickened many-nerved outer glumes, with the flowering glume 

 and palet indurated. 



1. A. Floridanum, Chap. Florida. 



2. A. Pnrshii, Kth. New Jersey to Florida. 



Eeiochloa, II B. K. 



Spikelets with a peculiar cup-like or annular swelling of the 

 pedicel just below the base, nearly sessile in one or two rows along 

 one side of the slender branches of a simple panicle. The spikelets 

 with one perfect flower, or with a second male or neutral one ; the 

 outer glumes empty, hairy, nearly equal membranaceous, acute or 

 acuminate; the perfect flower somewhat shorter, coriaceous, obtuse 



