PANICK.K. 165 



floret oviito-limceolutc, /i-nerveil, 7 iiini. lonp;; floral glume of the 

 teniiiiiul lloret S-norved, 5-() iiiiu. long. 



Sometiiiu'!^ (uiltiviitud us uii onmniciitiil i)liint. 



South Aniorioii. 



4. P. cenchroides IJich. I'ers. Syu. I : T'^ (1805). Gymnothrix 

 cencliroides l{. Ot S. Svst. 'i:\W (ISli). 



('ulnis sleiuler, gonicuhito. brunching Ir'Iow, 30-()0 cm. liigh. 

 Slieutlis about luilf us long us the internodes; lijjfule eiliute; bhules 

 tlut. smooth or nearly so, 8-1"^ cm. loii^j, ;5-5 mm. wide. Spike 

 dense, exserted. ovate, !i-4 em. long, the involucre usually contain- 

 ing 2-;{ spikelets, consisting of simple spreading bristles below, 

 and erect plumose bristles united mori' or less at the base, the latter 

 2-.'5 times as long as the spikelets. S|)ikelets ovate-lanceolate, 4-5 

 mm. long, first glume thin, ovale, 1 -nerved, ahnost 'I mm. long, sec- 

 ond a little longer, l-;)-nerved; floral glume of staminate spikelet 

 broad-ovate, with 5 |)rominent nerves, its palea ovate, nearly as long; 

 floral glume and palea of terminal floret much like those of the 

 lower floret, oidy a little longer. 



Plant from the l'. S. Dept. Agricul. grown from seed from 

 Mexico. 



5. P. Mexicamim llemsl. l?iol. (\>ntr. Am. Hot. :5: 508 (ISSO). 

 Gymnotliri.i.Mcxifditti Fourn. Mex. IM. Knuni. (iram. 48 (ISSO). 



Culms snu)oth. !iO-i:iO cm. high from a branching base. Ligule 

 a mere ring; blades s( abrous above, long-pointed, 40-50 cm. long, 

 10-15 mm. wide. S|)ikes terminal, jtartially enclosed at the base, 

 yellowish white or light straw-color. '^0 cm. long, 1 cm. diam., bris- 

 tles of the involucre K-'25, some shorter, some as long as the 

 spikelet, and some longer; one of them 10-15 mm. long. Si)ikelets 

 solitary, linear-lanceolate, 5 mm. long, tii'st glume cuneate-ovate, 

 obtuse, 1-uerved, 3 mm. long; second aiul third equal, linear- 

 iMiiccolate before s])reading, 5-nerved; floral glume of fertile floret 

 hyaline, otherwise much like the second and third glumes; jialea 

 of the lower neuter floret short, of the fertile floret 3.5 mm. long. 



Mexi'jo, Palmer 514, Prinyh' 4:510. 



6. P. bambuBiforme llemsl. Biol. Centr. Am. Bot. 3: 507 (1880). 



