JONES. — A REVISION OF THE GENUS ZEXMENIA. 157 



" In the Gray Herbarium there is another specimen from the same 

 locality as the Pittier specimen here cited and with the same number, 

 In it said to have been collected by Tonduz. This was rightly referred 

 by Dr. Klatt to Sahnea Eupatoria, DC. (S. scandens, DC). Notwith- 

 standing a close habital similarity the plant of Pittier exhibits, by the 

 presence of fertile ray -flowers with triangular achenes as well as by the 

 pappus both in the ray- and disk-flowers, the technical characters of 

 Zexmenia." 



++ ++ 4_ Bracts in few series, subequal. 



= Heads on short peduncles (10 to 25 mm. long) in close clusters; bracts of the 

 involucre ovate, rather long-acuminate. 



25. Z. elegans, Sch. Bip. Leaves oblong-lanceolate to ovate, acute 

 to somewhat rounded at the base, acute or acuminate at the apex, serrate, 

 strigose or scabrous, beneath sparsely pubescent on the veins ; petioles 

 less than 1 cm. long, pilose : peduncles several in a cluster, terminating 

 the branches, 10 to 25 mm. long, usually pilose; involucre subglobose or 

 campanulate, 7 to 10 mm. wide, 2-3-seriate ; outer bracts ovate, caudate- 

 acuminate, pubescent : ligules about 7 mm. long, somewhat exceeding 

 the disk ; disk-corollas slightly surpassing the involucre : achenes 4 to 

 5 mm. long, those of the ray-flowers usually with 1 long awn and 2 short 

 teeth, those of the disk-flowers rounded at the summit, cuneate toward 

 the base, with 2 unequal awns shorter than the body. — Sch. Bip. ace. 

 to Benth. & Hook. f. Gen. ii. 373 (1873), without description — 

 Southern Mexico. Specimens examined, — Vera Cruz : Mirador, 

 Liebmann, no. 378 (type, in herb. Gray) ; Sartorius (without data) ; 

 Orizaba, Pringle, no. 5911, Gray, May, 1885, Thomas, Coll. of 1864, 

 Botteri, no. 800 (in part). This species, although long recognized, seems 

 never to have been described. 



26. Z. costaricensis, Benth. Branching shrub or lignescent herb : 

 leaves 5 to 16 cm. long, 4 to 11 cm. wide, generally broadly ovate, with 

 acuminate or rounded base, and very acuminate apex, subentire to 

 serrate, above scabrous to densely strigose, beneath strigillose to densely 

 pubescent; petioles 1 to 3 cm. long, puberulent to villous: peduncles 

 fasciculate in terminal or subterminal clusters, 1 to 5 cm. long, puberulent 

 to villous; heads 6 to 12 mm. high; involucre campanulate to subcvlin- 

 drical, 5 to 10 mm. broad, about 2-seriate, outer bracts villous, from 

 oblong to obovate or slightly panduriform, acute or occasionally rounded ; 

 ligules oblong, about 1 cm. in length : disk-corollas with short tubes : 

 achenes about 4 mm. long, those of the disk-flowers somewhat margined 



