48 POACEAE 
3. S. jim (Ell) Nash. Stem 1-2 m. tall: panicle 20—40 cm. long: spike- 
lets 6-8 m ong. ouem secundum Chapm.]—Pinelands, Coastal Plain, 
Fla. to Tex., ed S. C | 
15. RHAPHIS Lour. Our species annual, with open panicles, the three 
spikelets (reduced racemes) borne at the ends of long slender naked branches. 
Spikelets in 3’s, one sessile and perfect, the 
other two pedicellate neo or sometimes 
a pair below, one fertile and one sterile: fer- 
tile spikelets terete, glumes coriaceous: 
sterile and fertile lemmas hyaline, the latter 
long-awned.—Twenty species, widely distrib- 
uted in tropical regions. 
1. R. pauciflora (Chapm.) Nash. Stem 0.5- 
1 m. tall: panicle eel open, the branches 
2-5 em. long: spikelets about 8 mm. long, the 
peduncle disjointing obliquely leaving : a oe 
sy 
e: 
below. [Sorghum  pauciflorum 
Pinelands d old fields, pen. Fla.—( Cuba. i) 
16. HETEROPOGON Pers. Annuals or perennials, often robust with flat 
leaf-blades and solitary terminal r es: raehis slender, the lower part, bearing 
the pairs of med spikelets, continuous, the remainder disarticulating ob- 
liquely at the base of each joint, the joint forming a on arp-barbed callus below 
the fertile o - pedicellate dcm readily falling, its pedicel remaining, 
obseured i e hairs of the callus. Spikelets in pairs, one sessile, the other 
Ae ed of dus lower pos to several pairs staminate or neuter, the re- 
mainder of the sessile spikelets perfect, terete, long-awned, the pedicellate spike- 
lets, like the lower, staminate, flat, conspicuous: glumes of the fertile are 
equal, coriaceous, the first brown- d infolding the second: lemmas hyaline 
the fertile one bearing a strong bent and twisted brown awn: palea wan d. 
glumes of the staminate spikelet ie 
hide. the first green, faintly many-nerved, 
nsymmetrieal, one submarginal keel rather 
broadly winged, the other e the mar- 
gins inflexed, the second glume narrower, 
symmetrical.—Six species, most ins in 
the Old World. Our species is annual. 
1. H. eed iod a bs l- 
2 m. tall, bra 3-6 cm. long: 
sessile spikelet z i Hest the wn 10-15 
em. long: pedicellate spikele 1. 5-2 cm. long, 
acuminate, the first glume with a row of oil 
glands. [H. acuminatus "ri n.]—Fields and 
open grounds, Coastal Plain, Fla. , Ala., and Ga. ; also in Ariz.—(Mez., C. A., S. A.) 
17. NAZIA Adans. Low annuals with flat leaf-blades and terminal spikes, 
the bur-like clusters of spikelets rather closely arranged along a slender axis. 
