ghaminejE. (grass family.) 675 



oblong-obovato aoutc spikclets near the summit ; glumes papillosc-hispiil, tlic 

 oppcr one S-ncrvcd, longer than the pointed granular-rougliened perfect llower ; 

 the lower minute, obtuse. — Dry soil, Florida to South Carolina. — Culms 1°- 

 2° long. Spikclets U" long. 



* * * Spik'elets s(V//e, on a spread itifj pedicel, disposed in open panicles : sterile Jloiver 

 consisting of two unequal jKilece, neutral (except No. 17) : perennials: culms at 

 length much branched. 



17. P. latifolium, L. Culms smooth, erect; leaves ovate-lanceolate, 

 mostly sniotitli, the slicatlis, especially at the joints, villous; panicle nearly sim- 

 ple ; spikclets large {•!" long), obovatc ; glumes pubescent, obtuse, the upper 

 2-3 times longer than the lower one ; sterile flower 3-androus. — Dry rich soil, 

 Florida, and northward. May. — Culms 1°-1^° high. Leaves and panicles 

 3' -4' long, the latter exscrtcd. 



IS. P. clandestinum, L. Culms rigid (1° high), branched, naked at 

 the joints; leaves lanceolate, acuminate, the sheaths papillose-hirsute; panicles 

 small, lateral and terminal, more or less Included in the sheaths ; .spikclets ob- 

 long, pubescent (li" long) ; lower glume half the length of the 7-ncrved upper 

 one. — Dry sterile soil. North Carolina, and northward. Sept. IJ. — Varies 

 with the sheaths smooth, or merely pubescent, and the terminal panicle some- 

 times exscrtcd. 



19. P. SCOparium, I.-- Hairy or woolly all over, except the upper sur- 

 face of the somewhat rigid lanceolate leaves ; culms stout (1°- lj° high), mostly 

 simple ; panicle terminal, exscrtcd ; spikclets obovate (1^" long), obtuse, pubes- 

 cent ; upper glume 9-ncrved, three times the length of the lower one ; sterile 

 flower neutral. — Open woods and margins of fields, in dry soil, Florida to 

 North Carolina. May. 



20. P. pauciflorum, Ell. "Panicle expanding, few-flowered; flowers 

 very large ; leaves narrow-lanceolate, ciliate at the base ; sheaths hairy." Ell. — 

 In close damp soils, Georgia, Elliott. May. — Culm 12'- 18' high, roughish 

 and branching at the joints. Leaves 3' -4' long, 3" -4" wide, smooth above. 

 Spikclets oval, the lower glume very small. Resembles P. scoparium in fruit, 

 and P. villosum somewhat in habit. ( *) 



21. P. divaricatum, L. Shrubby, smooth; culms reclining, with short 

 and spreading branches; leaves lanceolate, faintly nerved, deciduous from the 

 persistent sheaths ; panicles small, simple, few-flowered, terminating the branches ; 

 spikclets (2" long) obovate, tumid, nodding ; glumes smooth, many-nerved, and, 

 like the lower palea of the sterile flower, tipped with a tuft of down ; palea; of 

 the sterile flower nearly equal. — South Florida, Dr. Blodgett. — Leaves 1 j' - 2' 

 long Branches of the panicle short and diverging. 



22. P. viscidum, Ell. Soft-hairy or downy all over, except a narrow ring 

 below each joint of the culm ; leaves lanceolate ; sheaths viscid ; panicle (4' -6' 

 long) compound, diff'use ; spikclets (1" long) ovate, pubescent; upper glume 

 9-nerved, many times longer than the minute lower one. — Varies with the 

 leaves, sheaths, and purple spikclets smooth. — Wet swamps and bogs, near the 



