500 
13. P. plicatulum Michx. Culms slender, usually simple, 5 toe 10 dm. high: 
leaves slender (3 mm, wide or less), involute at the attenuate points: spikes 3 to 5, 
arcuate or rather rigid, 4 to5 em. long; rachis narrow, flexuous: spikelets oblong, 
obtuse, nearly 3 mm. long, nearly smooth; second empty glume transversely plicate 
near the margins; floral glume and palet dark brown at maturity.—Extending from 
the gulf States into eastern Texas, 
++ ++ ++ Spikelets more than 3 mm. long. 
I4. P. racemulosum Nutt. Culms nearly 1 m. high, slender, simple, from sealy 
rootstocks: leaves lanceolate, flat; blades and sheaths usually pubescent: spikes 3 
to 5, nearly erect, 5 to 10 em. long; rachis very slender, flexuous, loosely flowered 
with distinctly pedicellate spikelets: spikelets oblong or obovate, 3 to 4 min, long, 
nearly smooth.—In moist soil, eastern Texas, not common. 
15. P. dilatatum Poir. Culms 8 to 12 dm. high, simple ereet: leaves 2 to 3 dm. 
long, less than 1 cm. wide: spikes 4 to 7, somewhat spreading, 7 to 10 em. long, 
hairy at the axils; rachis 1 to 2 mm. wide: Spiselets in 4d rows, ovate, acuminate, 3 
mm. long, pubescent, villou rom the Atlantie States 
to central Texas, in moist soil. 
16. P. difforme Le Conte. Culms nearly 1m. high, from strong, sealy root- 
stocks: leaves rather rigid, 1 to 1.5 dm. long: spikes 2 to 4 (usually 2), 4 to 7 em. 
Tong; rachis flexuous, about 1 mm. wide: spikelets broadly oblong, nearly 4 mm. 
foes smooth.—Moist soil, eastern Texas. 
. P. Ploridanum Michx. (LARGH-FLOWERED PASPALUM.) Culms 1 to 1.5 m. 
hisel robust: leaves 3 to6dm. long, 1 em, wide, usually pubeseent throughout: 
spikes 3 to 7, nearly erect, 8 to 12 em. long, hairy at the axils; rachis nearly 2 mm, 
wide: spikelets oval, nearly 4 mm. long, smooth and often glaucous.—River bottom 
lands, central Texas to Florida and Dalaware. Var. GLABRATUM Engelm. has smooth 
leaves and sheaths, 
+ + + Spikes numerous, 20 or more. 
18, P. virgatum L, var. PUBIFLORUM Vasey. Culms 1 to 1.5 m. high, robust: 
leaves 2 to 8 dm, long, 8 to 1L mm. wide: spikes 20 to 30, 8 em. long or less, mostly 
alternate in a slightly spreading panicle about 2 din, long, rather crowded above: 
spikelets ovate, acute, hairy on the margins, about 2 mm. long.—Moist uplands, east- 
ern Texas to Louisiana. 
§ 2. Spikelets distichous rather than secund, with the back of the floral glume turned out- 
wards or away from the rachis. —ANASTROPHUS. 
19. P. compressum (Swartz) Nees. (CARPET GRASS. ) Culns slender, compressed 
below, 3 to6dm, high froma creeping base: leaves linear, obtuse, smooth : spikes very 
slender, 5 to 8 em, long, a pair at the apex of the enim with often 1 to 3 approximate 
and sometimes others on long lateral peduncles: spikelets single, linear, subacute, 
2mm. long, the empty glumes slightly longer than the floret. (Milium compressum 
Swartz, 2’. platycaule Poir.)—Moist meadow land, forming more ne: rly a continuous 
sod than any other species of the genus, eastern 1. exas to Virginia. 
20, P. furcatum Fliigge. Culms 4 to 8 dm, high from a creeping base: leaves 
lanceolate, rather blunt-pointed, usually smooth: spikes slender, 1 to 1.5 dm. long 
in pairs, usually some on lateral axillary peduncles: spikelets lanceolate, 5 to 6mm. 
long, the attenuate empty glumes one-third longer than the obtuse floret.—Moist 
soil, eastern Texas to Virginia. 
15. ERIOCHLOA HBK. 
Spikes paniculate, unilateral, with a rather slender rachis: spikelets 
with a cup or annular swelling at the base, 1-flowered or with 1 per- 
fect and 1 staminate or neutral floret: outer glumes nearly equal, 
