114 PANK'ACI-LE. 



acuto, 1-2 mm. loii<j;. ."{-norvod, second o-nervod, tliird or llonil 

 glume to the neuter lloret like the second empty glume ; pulea iis long 

 as its glume, oval, hyaline; fertile floret rugose, oval, mueronate. 



Mexico, PritKjle ;3T5. Palmer 254. 



Found in Mexico, West Indies, Egypt, and India, and very like- 

 ly in Texas and New Mexico. 



13. P. Isachne Hoth, Nov. PI. Sp. 54 (1821). Var. Mexicana 

 (Vasey). P. crucifurmc Sibth. Fl. Gra^c. 1:44, /. 59 (1806). 

 Var. Mexicana Vasey, iued. 



Culms branching, creeping below, nodes hairy, 20-40 cm. high. 

 Leaf -blades flat, rough, broad at the base, sometimes hairy, r)-10 

 cm. long, 3-7 mm. wide. Panicle secund, luivrow, 0-12 cm. long, 

 sometimes partially included. Spikes 8-12, alternate. 1-2 cm. 

 long, rachis filiform. Spikelets single, alternate, imbricate for 

 half their length on pedicels less than 1 mm. long, attached to one 

 side of the rachis, pubescent, elliptical, almost acute, 1.7 mm. long, 

 first glume broad, minute, sec -iid ovate, obtuse, 5-nerved, as also 

 is the fioral glume of the neuter floret, its palea obtuse, shorter; 

 fertile floret smooth, al)out 1.5 mm. long. 



Specimen seen was cultivated from seed obtained in Mexico, by 

 r. S. Dept. Agricul.. 1887. 



14. P. paspaloides Pers. Syn. 1:81 (1805). 



An erect stout glabrous perennial. s[)aringly branched, 00-!)0 

 cm. high. Leaf-blades 20-30 cm. long, mm. wide. S[)ikes 

 10-20, erect. simi)le. alternate along 2-3 centimeters of the axis. 

 2-3 cm. long. Sj)ikelets single, subsessile on two sides of a 

 flexuous. triangular rachis, those in one row overlapping for one- 

 fourth their length, glabrous, doubly convex, oval, acute, awnless. 

 2.5 mm. long, containing a staminate and a perfect flower: first 

 and secoiul emjjty glumes membranous, broad, obtuse, the former 

 lu'rveless, 0.5 mm. long, the latter twice as long. 4-iu'rved ; floral 

 glinne of the lower floret 5-nerve(l : palea as long, hyaline, obtuse, 

 second floret oval. 



Mexico. Pdhiirr -^V.). tiilO, Prinnh' XV.\(\\ Texas. Xrallr/f. 



In water, Florida to Texas and Mexico; also fouiul in Central 

 America, Mauritius, Hrazil, Egypt, tropical Africa, and East Indies. 



