‘ 
301 
2d glume firm, ovate, obtuse, three-fourths as long as spikelet, 
5-nerved, scabrous; 3d glume firm, ovate-lanceolate, acuminate, 
slightly exceeded by fourth glume, 5-nerved, scabrous; 4th glume 
chartaceous, ovate-lanceolate, acuminate, 6-7 mm. long, 5-nerved, 
scabrous at apex; palet of first flower about as long as glume, 2- 
nerved, strongly scabrous ; palet of perfect flower as long as glume, 
chartaceous, ovate-lanceolate, faint!y 2-nerved; seed obovate to 
elliptical, 2.5 mm. long, 1.5 mm. wide, compressed. 
This plant is well marked by its broad flat leaves, and the 
slender barbed bristles surrounding the base of the involucre, 
which contains double the number of spikelets found in the other 
species. 
North Carolina to Texas, along the coast. 
4. CENCHRUS INCERTUS M. A. Curtis, Bost. Journ. Nat. Hist. 1: 
135) 1837. 
Stems erect or decumbent at base when young, finally creep- 
ing, 3-6 dm. long, smooth; sheaths smooth, inflated, compressed, 
striate, lower ones more or less overlapping, upper shorter than 
internodes, 5—9 cm. long; leaves smooth, flat, 4-15 cm. long, 3-5 
mm. wide; spike generally exserted, 3-6 cm. long, 8-20-flowered, 
internodes of the scabrous rachis 2-5 mm. long; involucre 2- 
flowered, pubescent, ovoid, smooth at base; spines about 3 mm. 
long, very broad at base, ciliate; spikelets 5 mm. long, more or 
less exserted from involucre; 1st glume hyaline, triangular, acute, 
strongly 1-nerved, one-half as long as spikelet; 2d glume of firm 
texture, ovate, obtuse, about three-fourths as long as spikelet, 5—7- 
nerved, scabrous; 3d glume ovate, acute, 5-nerved, somewhat 
shorter than fourth glume, scabrous; 4th glume chartaceous, 
broadly ovate, acute, about 5 mm. long, strongly 5-nerved and 
scabrous at apex; palet of first flower about equaling glume, 
strongly scabrous, 2-nerved, empty or enclosing three stamens; 
palet of perfect flower chartaceous, ovate, acute, about equaling 
glume, scabrous at apex; seed oval, 2 mm. long, 1.5 mm. broad. 
Ranges from South Carolina to Florida and Texas, The 
smaller involucre, naked at base, with fewer and shorter spines, 
readily distinguish this plant from C. triéuloides which it some- 
what resembles. 
5. CencHrus myosuroives H. B. K. Nov. Gen. 1: 115. 1815. 
Panicum cenchrotaes EN. Bot. S. C. and Ga. 1: 111. 181 7. 
Perennial from a running rootstock. Stems 6-14 dm. high, 
simple, or branched above, terete, smooth; sheaths somewhat in- 
flated, 7-14 cm. long, striate; leaves smooth, 1-3 dm. long, 3-8 
