415 416 



lous, oft papillose; Ivs com rounded or pubescent; setae 5-12 at each spkt, un- 



truncate at base, pubescent or glabrate, equal, y'ish, 3-8 mm Ig; spkts broadly 



those of cu 4-6 cm Ig, those of branches ovate, 3 mm Ig; palea convex at base, 



much sh'er; terminal panicles less than concave above, transversely striate. Ab 



8 cm Ig, ovoid, their branches ascend- 25. 



ing; lateral panicles much sh'er, not ex- Setaria glauca Beauv Agrost 51 (1812). 



ceeding Ivs; spkts scarcely 2 rnm Ig, Panicum glaucum L. sp. PI 56 (1753). 



pubescent. Chamaeraphis glauca Kuntze Rev. Gten. 



P. STBUMOSUai Presl, Rel Haenk 1:303. PI. 2: 767 (1891). 



B 2:260. Cal. Ixophorus glaucus Nash Torr bot. cl. b. 



P. TEj22,:-IAI.E Bolander. Cal ac pr 22:423 (1895). 



2:181. B 2:259, and Curran, Cal ac b CHAETOCHLOA IMBERBIS Scribn. 



1:150 as P. dichotonum. Ha 59. Scribner, U S D-A agr b 4:39. 



PANICUM URVILLEANUM Kth. Parish, Erythea 7:89. Locally intro- 



Kunth, Rev Gram t 115. Brongn Voy duced at Los Angeles (Hasse; Davidson). 



Coquille, Pharn 117 t 9. B 2:259. Per; cu erect or ascending, more or 



Cu per, 1-2 hi, with the whole plant les caespitose, from creeping rtstocks, 



clothed with w'ish hairs: Ivs rigid, slender, compressed, scabrous below the 



1-1% ig. 3" wide at the flat base, con- panicle, otherwise smooth: sheaths glab, 



volute above and ending in a very Ig the lower much Iger than internodes, 



tapering point: panicle 6-10' Ig, open smooth on the hyaline margins; Ivs 1-3 



the not num branches solitary or in dm Ig, 3-7 mm wide, Ig tapering to apex, 



pairs, bearing toward their ends a few slightly scabrous on upper surface and 



hairy large spkts, 2-3" Ig, ovate, margins; spks 2-5 cm Ig, nearly 1 cm 



acute: lower gm 7 -nerved, 2-3ds the broad; rachis angular, pubescent, branch- 



length of the 15-nerved upper one, the es sh, 1- or rarely 2-fld; setae 8-12, 



nerves in both distinct and g'ish: sterile spreading, 5-10 mm Ig, unequal, slender, 



floret stam, with 2 palets, the lower 15- finely antrosely scabrous; spkt ovate, ac- 



nerved; perfect floret oblg, smooth ex- ute, 2-2.5 mm Ig; 1st gm about one-third 



cept a fringe of ig silky hairs upon the to two-thirds as Ig as spkt, ovate, acute, 



margins. 5-7-nerved; 3d gm equaling the flg gm, 



Colorado Desert; Arizona; Chili. 5-nerved, subtending a broad palea of 



P. WALTESIA Ell sketch 1:115. Chapm its own length; flg gm elliptic-ovate, 



Fl 557. B 2:260 as P. colonum. finely transversely rugose; palea plane 



SY2TTHEBI3MA Walt, Fl Carol 76 or concave above. Ab 25. SBer. 



(1788). IK as Panicum. Setaria imberbis R-S Sys 2:89. 



Ann grasses with flat Ivs: spkt borne Setaria caudata Davidson, PI L A Co 



in pairs or in 3's in secured spk which 31, not R-S. 



are digitate or approximate at the sum- ERIOCHLOA PUNCTATA Ham. 



mit of cu: gm 4 or 3, the innermost one Ft. Yuma, Cal. (Or 2065). 



chartaceous, subtending a palea of sim- CENCHB.US L. Caroll Gen 20 (1737). 



ilar texture and a perfect fl: sta 3: stig c. ECHINATTJ3 L, sp pi 1050. Z 1:187; 



plumose. Crab-grass. 2:34 ( =C. tribuloides). 



S. SANGTJIITAI.IS Dulec, Fl Hautes-Pyr c. MYOSUROIDES HBK, nov Gen 1:115 



Ab 23. Panicum sanguinale L, fide t 35. B 2:261. Son. Vasey, CNH 3:39. 



IK. Fla, Ga, Tex. 



Cu erect or decumbent, oft rting at CENCHRUS PALMERI Vasey. 



the lower nodes, 3-9 dm Ig, smooth; Calmalli (Orcutt 2573). 



sheaths glab or pubescent: Ivs 5-15 cm c. PAUCIPLOBTTS Bth, bot sulph 56. B 



Ig, 4-8 mm wide, acuminate, glab or pub- 2:261 as a few-fid form of C. tribuloides 



escent; spks 3-10, nar'ly linear, 4-15 cm (Baja: Carmen Island). 



Ig, digitate at summit of cu; rachis flat, c. SPUTIPEX Cav Ic 5.38 t 461. B 2:261 



winged; spkt 2.5-3 mm Ig, in pairs, 1 ses- a s C. tribuloides. 



sile or nearly so, lanceolate: first gm CBNCHRUS TRIBULOIDES L. 



minute, 2d a half to a 3d as Ig as the L, sp pi 1050. B 2:261. Ab 26. Z 1:187; 



spkt. 2:34. Eu SBer. 



Genus CHAETOCHIiOA Scribner. Cu erect or decumbent from an ann 



Ann or per grasses with erect cu, flat r t, com robust, 15-45 cm hi, freely 



Ivs, and dense cylindric or somewhat branching; sheaths com very loose, corn- 



open bristly spk-like panicles: spkt her- pressed smooth; Ivs 6-10 cm Ig, 4-8 mm 



maphrodite. com 1-fld: gm 4, outer 3 wide; spks 25-50 mm Ig; inv crowded on 



membranous, 3d oft subtending a hya- the scabrous rachis, globose, pubescent 



line palea and rarely a stam fl, 4th or except at the base, spines stout; spkt 



flg gm chartaceous, smooth or trans- 2-fld, about 6 mm Ig. 



versely rugose, inclosing a palea simi- New England; Baja; Arizona. 



Tribe PHALARIUKJE. Spkt 



GLATJCA scribn. more [ ^laterally compressed, 1 - 



Erect or ascending caespitose glau OF rarely O-Ed; Sfm 0. 1st 4 empty A 



an, 3-12 dm hi; culms branching at base, below articulation of rach, 3d & '4th 



compressed, glab; nodes smooth; sheaths ' . , 



glab; liguie sh ciiiate; ivs 5-15 cm ig, 4-8 above, com empty or rarely subtend- 



mm wide, Ig acuminate, nearly glab or a f nrn fl fi V prv rmlikft thp othpr 



scabrous on upper surface and margins, m g 8tam ns ; ver J *" . Ol i ne 



com pilose with scattered Ig hairs at onCB, sometimes reduced to bristles, 

 base; spks about 1 cm in diam; rachis 



