JONES. — A REVISION OF THE GENUS ZEXMENIA. 155 



awn shorter than the body ; disk-achenes slightly narrower and longer, 

 their 2 awns subequal, longer than the body and at maturity much 

 exceeding the involucre ; squamellae none or minute. — Sch. Bip. in 

 Seemann, Bot. Voy. Herald, 305 (1852-57); Hemsl. Biol. Cent.-Am. 

 Bot. ii. 172. Verbesina ceanothifolia, Willd. Sp. PI. iii. 2225 (1804) ; 

 DC. Prodr. v. G13 (1836). Lipochaeta umbellata, DC. I.e. 610 (1836). 

 — Mexico. Specimens examined, — Vera Cruz : Orizaba, Botteri, nos. 

 800 (in part), 477, and 487; Thomas, coll. in 1864. Morelos : Cuer- 

 navaca, Berlandier, no. 1065 (co-type, in herb. Gray) ; Pringle, no. 91 63 ; 

 Holway, no. 3530; Bourgeau, no. 1219. Oaxaca : Sierra de San 

 Felipe, Pringle, no. 5783 ; Conzatti S? Gonzalez, no. 993 ; Bait.es, coll. 

 in 1846. Jalisco : near Guadalajara, Pringle, nos. 2167 and 2301 ; 

 near Colotlan, Rose, no. 2814. Tepic : Palmer, presumably coll. 

 of 1892. 



Var. conferta, Gray in herb. Leaves lanceolate to elliptical, 1 to 

 2.5 cm. wide, attenuate to subtruncate at the apex, finely appressed- 

 pubescent on both sides, subsessile : peduncles few to numerous, generally 

 very short ; involucre about 3-seriate ; bracts acute : ligiiles apparently 

 lemon-yellow. — Lipochaeta umbellata, var. conferta, DC. Prodr. v. 610 

 (1836). — Mexico : Specimens examined, — Morelos : Cuernavaca, Ber- 

 landier, no. 1053 (type, fragment in herb. Gray). Without exact locality, 

 Gregg, no. 1070. Tepic: Acaponeta, Lamb, no. 519. 



21. Z. microcephala, Hemsl. Shrub with scabrous stems: leaves 

 ovate-lanceolate, 4 to 10 cm. long, minutely serrulate, obtuse, short- 

 petioled, rugose and strigillose above, strigillose, whitish, and with veins 

 prominent beneath : peduncles slender, fasciculate-corymbose, about 

 15 mm. long; heads about 1 cm. high; involucre 4 to 6 mm. wide; 

 bracts subcordate, oblong or ovate, rounded at the apex : ray-flowers 

 about 4 ; ligules oblong-elliptical; disk-flowers about 20; teeth of the 

 corollas hirsute : achenes glabrous, with 2 or 3 wing-like margins 

 upwardly adnate to the awns; squamellae none. — Biol. Cent.-Am. 

 Bot. ii. 173 (1881). — Western Mexico. Specimens examined, — 

 Tepic : San Bias, Sinclair (a leaf and head from herb. Kew). 



= = Aclienes about 3 mm. long, those of the ray-flowers obovoid, rounded above 

 and with one long awn and two short teeth, those of the disk-flowers somewhat 

 cuneate, scarcely 1 mm. wide at the summit and with two slender unequal awns 

 shorter than the body. 



22. Z. imbricata, Sch. Bip. Suffruticose, canescent ; stem glabrate : 

 leaves 1 cm. long, subcordate, ovate, acute, irregularly dentate, scabrous ; 

 petioles about 2 cm. long: heads in the upper axils; involucre hemi- 



