GRAMINEAE. 
1. Paspalum mucronatum Muhl. Water Paspalum. (Fig. 227.) 
Paspalum mucronatum Muni. Cat. 8. 1813. 
Ceresia fluitans El. Bot. S. C. & Ga. 1: 109. 1817. 
Paspalum fluitans Kunth, Rey. Gram. 1: 24. 1829. 
Culms ascending, 6’-3° long, from a floating or 
creeping base, branched. Sheaths very loose or in- 
flated, smooth or scabrous, glabrous or pubescent ; 
leaves 3-12’ long, 14’-1’ wide, acuminate, scabrous ; 
spikes 20-100, %/-3/ long, alternate or whorled, 
slender; rachis flat, thin, exceeding the spikelets, 
long-acuminate, scabrous, its margins nearly en- 
closing the spikelets; spikelets in two rows, 
about 4’ long, elliptic, pubescent ; outer scales very 
thin, 2-nerved, the first one usually a little the longer. 
In water, Virginia to southern Illinois and Missouri, 
south to Florida and Texas. Also in tropical America. 
Sept. 
2. Paspalum membranaceum Walt. 
Paspalum membranaceum Walt. Fl. Car. 75. 1788. 
Not Lam. 1791. 
Paspalum Wallerianum Schultes, Mant. 2: 166. 1824. 
Culms erect or ascending, much branched, 
smooth, creeping at the base. Sheaths a little in- 
flated, smooth; leaves 1}34/-314’ long, 2//-3/ 
wide, flat, smooth, acute ; spikes 3-7, alternate, 
about 1’ long, the lower ones usually included in 
the upper sheath ; rachis not exceeding the spike- 
lets, flat, thin, 1/’-1%4’’ wide, acute, smooth, 
many-nerved, its incuryed margins partly enclos- 
ing the spikelets; spikelets about 1’ long, crowded 
in 2 rows, oval, obtuse, smooth; outer scales 5- 
nerved; third scale lenticular, slightly shorter 
than the outer ones. 
Moist or wet grounds, New Jersey and Delaware to 
southern Ohio, south to Florida and Texas. Sept. 
Walter’s Paspalum. 
(Fig. 228.) 
— 
3- Paspalum distichum [L. Joint-grass. 
(Fig. 229.) 
Paspalum distichum Y,, Amoen. Acad. 5: 391. 1759. 
Culms erect, 6’—-2° tall, extensively creeping at 
base. Sheaths smooth, sometimes ciliate on the 
margins, or sparsely pubescent; leaves flat, 1%./- 
5’ long, 1’’-2’’ wide, acuminate, smooth ; spikes 
1/-234’ long, in pairs, or occasionally with a third, 
exserted; rachis flat, %’’-1’’ wide, smooth; spike- 
lets 114’’-114”’ long, elliptic, somewhat pubescent 
or glabrous, acute, nearly sessile in 2 rows; outer 
scales 3-5-nerved, slightly exceeding the acute 
third one which is sparingly bearded at the apex. 
Virginia to Missouri and California, south to Flor- 
ida, Texas and Mexico. Also in the West Indies, cen- 
tral and South America. Aug.-Sept. 
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