POACEAE 57 
Panicle lax, the few to several idea. more or less 
. lon 
Spr eading : Spikelets about 3.5 m ng. 91. P. dilatatum. 
VIII. PLICATUL 
M Done 2 mm. long, nearly as broad, P M 
mm. wide: plant annual. 32. P. Boscianum. 
Spikelets: 3 mm. ones rachis 1 mm. or less wide: plant 
perennial 33. P. plicatulum. 
l. P. dissectum L.  Glabrous E subaquatic perennial: stem 20-60 e 
long: ride 3—6 em. lon mm. wide: racemes usually erect, 2-3 e 
long, is rachis 2-3 mm. vide: DAE 
mm. long, obovate, e glabrous. [P. mem- 
branaceum Walt. P. Walte a Schult.] 
—Muddy banks, ditches, wet sandy places, 
and in shallow water, Coastal Plain and 
rarely adj. provinces, Fla. to Tex., Mo., 
and Del.—(W. I.) 
T Berg. Aquatie perennial with 
ae tems as much as 200 em. long, 
cemes asce nding, Spreading or 
. lon 
Mei rather lax, 3—5 em. long, the rachis 
about : spikelets 1.4-2 mm 
T eliiptic “LP. mucronatum Muhl. 
fluitans Kunth Ponds, marshes, and streams, Coastal Plain, Fla. to Tex., 
Ill, and S. C.—(W. I., Mex.) 
3. P. vaginatum Swartz. Stem producing creeping rootstocks and also stolons 
100 em. or more lo ong, d as woring shoots 8-60 em. tall: leaf-sheaths inflated; 
blades 3-8 mm. wide: eme ually 2, at first aed finally spreading or 
Pn pies 3-4. e D nme pale. [P. reimarioides Chapm.]— 
(SALT JOINT-GRASS. )—Sencoasts and brackish marshes, Coastal Plain, Fla. to 
Tex. and N. G —(W. I., Mex., C. A., S. A.) 
4. P. distichum L. Resembling P. vaginatum: a = usually less inflated 
and papery: spikelets less flattened, first glume often sent on some of the 
a ae T-GRASS. 3.) —Ditches, fresh or D kish marshes and Aue 
Coastal Plain and Basin and Range, Fla. to Tex., Calif, Okla., and N. J.— 
(OF. I., Mex., c. A., S. 4.) 
5. P. conjugatum Berg. Perennial, extensively creeping: stems See 
flowering-branches as much as 100 em. tall: leaf-blades Pus thin, ae a le 
wide: racemes widely divaricate, usually arcuate, slende 0-12 lon io 
spikelets 1.5 mm. long, flat on both sides, pale- Codi silky- PUDE. Nd the 
margin.—Moist ground, Conatal Plain, Fla. to Tex —(W. I., Mez., C. A., S. A. 
6. P. Langei (Fourn.) Nash. Stem 70—110 em. tall: bis vind e. or 
sometimes hirsute, ciliate; blades flat, as much as 1.5 em. wide: 
7—9 em. long: spikelets obovate, 2.5-2.8 mm. lon ng. " [Dimorphostachys Pilitferd 
Nash]—Moist woods and thickets, Fla. to Tex.— (W. I.) 
Te P: pub dm Chapm. Stem erect, as much as 100 em. E leaf-sheaths gla- 
brous or the lo n deny villous; blades 2-15 m , glabrous, m 
ciliate: racemes eading or ascending. [P. pee rae Nash |— 
o and E Everglade Keys, and adj. Everglades, Fla. and Florida 
Keys.—(W. I.) 
