I»ANI(K.K. 87 



Bot. S. C. and fiti. 1: 109 (ISK). I'aspfduitifuitaus Kunth.. Rev. 

 Griim. 1:24 (18-^!»). 



Culms bninching, ascending;, creeping or flouting from iirliizomc, 

 30-90 em. long, nodes soft liairy. Upper sheutli extendiug iioiirly 

 to the spikes; blades flat, thin, acuminate, 5-15 cm. long, about I 

 cm. wide. S^jikes racemose, 40-GO, alternate and verticilhitc. 

 spreading, 3-7 cm. long, the thin rachis 1.5 mm. wide, extending 

 3 mm. beyond tlio spikelets. Spikelets in two vertical rows, pu- 

 bescent, oblong, acute, 1.5 mm. long, tirst and second glumes very 

 thin, "^-nerved. 



Louisiana, .1. />'. Lnuylois, collected in 18S5. 



Virginia to .southern Illinois and southward. 



6. P. repens Berg. Act. Ildvet. T, /. T:129 (1772). 



P. pyramiiUde Nees, Mart. Bras. 2 : 77 (1829). P. gracilc Steud. 

 in part. 



Culms creeping or floating in water, the ascending portion 20- 

 30 cm. high. Sheaths longer than the iuternodes, inflated, scabrid, 

 spotted, the throat bearing two peculiar stipular appendages. .5-7 

 mm. long; ligule lacerate, truncate, brown, 2-3 mm. long; bhides 

 flat, scabrous, acute. 10-18 cm. long, 7-15 mm. wide. S|)ike3 

 75-100 or more, ascrending, crowded into an erect, ovoid, spikeliko 

 raceme, about 9 cm. long; the spike 2-3 cm. long, the thiu invo- 

 lute rachis 3 mm. wide, the acuminate tip ))r<)jecting 8-10 nini. 

 above the spikelets. Spikelets in a single vertical row of 5-S in 

 number, oblong, subacute, 2-2.2 mm. long, first and second glumes 

 efjual, very thin, 2-nerved, a little longer than the floret. 



Mexico (Jalisco). PritKjh' 385-1; also found in South America; 

 growing in water. 



7. P. racemosum Lam. Illnstr. 1: ITii (ITiH). 



Culms erect, simple. 00-120 cm. high fi'oni a scaly root-stock. 

 Lower sheaths thinly clothed with long hairs; blades linear- 

 lanceolate, glaucous, keeled, 30-40 cm. long, 5-10 mm. wide. 

 Panicle erect, exsertetl, 15-20 cm. long. Spikes 3-4, lax, slender, 

 4-lG cm. long, rachis tri(|uetrous-terete, flexuose. Spikelets 

 smooth, in alternate ])air8, distant, pedicels 2-5 mm. long, oval, 

 obtuse, about 4 mm long, first glume ."i-T-nerved, second 3-5-nerved. 



