413 

 spiny inv. 



Gm 3; spkt sessile or on sh pedicels in 

 unilateral spkt or racemes. Paspalum. 

 Spikes digitate. Syntherisma. 

 Spikes not digitate. Panicum. 

 B. spkt surrounded by a bristly or spiny 

 inv. 



Bristles slender, not falling with spkt. 

 Chaetochloa. 



Bristles thickened below, spine-like, 

 falling with spkt. Cenchrus. 



Genus PASPALUM Linnaeus. 



L, syst ed X, 855 (1759). 



Per grasses of various habit, with 

 "com flat Ivs and 1-fld spkt borne in 2-4 

 rows on 1-sided spk, which are single, in 

 pairs or panicled: spkt oblg to orbicu- 

 lar, flat on inner surface, convex on 

 outer: gm 3, rarely 2 by absence of 

 outermost, outer ones membranous, in- 

 ner one indurated and subtending a 

 palea and perfect fl: sta 3: sty distinct; 

 stig plumose: ova oblg or ovoid, smooth. 

 PASPALUM DISTICHUM L. 

 L, Amsen, ac 5:391. Ab 22. Da 18. Z 

 1:185. 



Jamaica to Cal. ; San Diego Co (Or 508). 



Cu erect, 15-35 cm hi, creeping at base; 

 sheaths smooth, sometimes ciliate on 

 margins or sparsely pubescent; Ivs flat, 

 4-10 cm Ig, 2-4 mm wide, smooth; spks 

 25-50 mm Ig, in pairs, or occasionally 

 with a 3d, exserted; rachis flat, 1-2 mm 

 wide, smooth; skpts 2.5-3 mm Ig, elliptic, 

 somewhat pubescent or glab, acute, near- 

 ly sessile in 2 rows; outer gm 3-5-nerved, 

 slightly exceeding the acute 3d one, 

 which is sparingly bearded at apex. 

 PASPALUM PUBLIFLORUM Rupt. 



Rupr ex Gal Brux ac b 92:237. Vasey, 

 grasses S W 25, So Cal. Parish, Z 5:111, 

 not So Cal, but Baja. Coulter, CNH 2:499, 

 Tex. 



Cu 5-10 dm hi, erect or ascending from 

 a creeping base, pubescent at nodes: Ivs 

 flat, lanceolate, 1-2 dm Ig, about 1 cm 

 wide: spks 3-6, spreading, 4-8 cm Ig; 

 rachis 4 mm wide; spkt in 2-4 rows, 

 oblg, obtuse, nearly 3 mm Ig. pubescent. 

 Variety GX.AUCUM Scribn. Coulter, CNH 

 2:499. 



Rigid cu and Ivs, glau thruout. S W 

 Tex; north Mex. 



P. VAGINATUH Swartz; Trin Sp Gram 

 1 t 12 a; Doell, Fl Bras 2 (2):75. B 2:257 

 as P. distichum. Coulter, CNH 2:499, 

 Tex to Fla. 



Genus PANICUM Linnaeus. 

 L, syst ed 1 (1735). 



Ann or per grasses, varying greatly 

 in habit and infl: spkt 1-2-fld, when 2-fld 

 lower one stam only: gm 4, the 3 lower 

 membranous, empty or the third with a 

 stam fl; the fourth chartaceous shining, 

 enclosing a palea of similar texture and 

 a perfect fl: awns com 0: sta 3: sty 

 distinct; stig plumose: grain free, en- 

 closed in the hardened fruiting gm and 

 palea. Panic -grass. 



P. AGROSTOIDES Spreng. Pugill 2:4. 

 Trin, sp gram 3 t 261. T, Fl NY 2:429 t 

 148. B 2:258. 



"Valley of the Sacramento", Cal. 

 P. CALIPORKTCUM Benth, bot Sulph 55. 

 Baja, B 2:260. 

 FANTCUM CAPILLARE L. 

 L, sp pi 58. Da 18. Ab 24. 



414 



Cu erect or decumbent, 3-6 dm hi, sim- 

 ple or sparingly branched; sheaths papil- 

 lose-hirsute; Ivs 15-30 cm Ig, 6-15 mm 

 wide, more or less pubescent; terminal 

 panicle com 2-4 dm Ig, lower branches 

 exserted and widely spreading, 1-2 dm 

 Ig; spkts 2-2.5 mm Ig, acuminate; first 

 gm %-% as Ig as spkt; second and third 

 gms nearly equal, acute, the fourth 1.5 

 mm Ig. 



Smith mt, S D Co (H. C. Orcutt); Baja. 

 PANICUM COLONUM L. 

 L, Syst ed X, 870. Da 18. Ab 24. B 2:260. 



Cu tufted, smooth, 2-G dm hi, oft de- 

 cumbent and rting at lower nodes; 

 sheaths compressed, com crowded; ligule 

 0; Ivs flat, 3-15 cm Ig, 2-8 mm wide; 

 panicles composed of 3-18, 1-sided more 

 or less spreading dense branches, these 

 1-3 cm Ig, spkts single, or in 2's or 3's in 



2 rows on one side of the hispidulous tri- 

 angular rachis, obovate, pointed; first gm 

 about half as Ig as spkt, 3-nerved. sec- 

 ond and third gms a little more than 2 

 mm Ig, awnless, 5-nerved, hispid on 

 nerves, the fourth cuspidate. 



Ft. Yuma, Cal. (Or 207); Baja (Or 1309). 

 Texas. 



PANICUM CRUS-GALLI L. 

 L, sp pi 56. B 2:260. Z 1:185. Da 18; 

 Er 1:10,0, L A Co. Ab 23. 



Cu -8 dm hi, com branching at base; 

 sheaths smooth; Ivs 1-5 dm Ig, 3-12 mm 

 wide, smooth or scabrous; panicle com- 

 posed of 5-15 sessile mostly erect or as- 

 cending branches; spkt ovate, g or p, 

 densely crowded in 2-4 row on one side 

 of rachis; second and third gms about 



3 mm Ig, scabrous or hispid, third gm 

 more or les awned, empty, fourth ovate 

 abruptly pointed. 



Ft. Yuma, Cal. (Or 2085); Baja. 

 PANICUM DICHOTOMUM L. 

 L, sp pi 58. B 2:259. 



Cu from a few i to 2 hi, erect, simple, 

 or late in season decumbent and vari- 

 ously branched: lower Ivs com ovate, up- 

 per linear-lanceolate, smooth, hairy, or 

 velvety; terminal panicle open, ovoid, 

 those of branches sh and oft included in 

 sheaths; spkts 1" Ig, oblg-obovate, 

 smooth or hairy: lower gm roundish, 

 one-third the length of the 5-7-nerved 

 upper one. Yosemite. 



San Diego Co (Or 540). 

 PANICUM SANGUINALE L. 

 L, sp pi 57. B 2:258. Da 18; Er 1:100, 

 LA Co. Ab 24, as Syntherisma canguin- 

 alis. 



Visalia, Cal.; Arizona. 



P. FIMBRIATUM Presl, Rel Haenk 

 1:298. B 2:258 as P. sanguinale. 

 P. GLABRTTM L. B 2:258. Eu, Asia. 

 P. GLAUCUM. L. sp pi 56. = Setaria 

 glauca fide. B 2:260. 



P. MILIACETTM L, sp pi 58. Millet. B 

 2:258. 



P. PAUCIFIiORUM Ell sketch 1:120.=P. 

 scoparium fide B 2:259. G, Man 648. 

 P. FOIiYRHIZTJM Presl, Rel Haenk 

 1:296. B 2:257 as Paspalum distinchum. 

 P. FUBESCEKTS Lam, Encyc 4:748. Ab 

 24 as P. scoparium. 



P. SCOFARXTJM Lam Encyc 4:744. Ab 

 24. B 2:259. 



Cu simple and erect, becoming pro- 

 fuse with age; sheaths hirsute to vil- 



