JONES. — A REVISION OF THE GENUS ZEXMENIA. 147 
outer involucral bracts obtuse; the inner acute: one awn of the ray- 
achenes about as long as the body of the achene ; squamellae very small. 
— Gen. ii. 373 (1873). Lipochaeta scaberrima, Benth. in Hook. Journ. 
Bot. ii.. 43 (1840).— South America. No specimens seen. Type 
collected by Schomburgk in the Roraima Mountains of Guiana, 1840, 
A doubtful species. 
+ + Involucral bracts in 3 to 5 series. 
+ Awns of the disk-achenes as long as the body. 
4, Z. Seemannu, Gray. Shrub, usually much-branched : leaves linear- 
oblong to oblong-lanceolate, 2 to 10 em, long, 7 to 15 mm. wide, acute 
to rounded at the apex, acute or acuminate at the base, subentire, shin- 
ing, hispid-scabrous above, glabrate beneath ; petioles 3 to 10 mm. long: 
peduncles commonly fascicled or cymose in umbelliform clusters in the 
upper axils, 3 to 13 mm. long; heads about 15 mm. high; involucre 
cylindrical, 5 to 8 mm. broad; the involucral bracts about 5-seriate, lax 
at the apex and variously toothed, the outer series very short; the inner 
much longer: ligules 6 to 8, about 1 cm. long: margined angles of the 
achenes very prominent and confluent with the awns; body of the disk- 
achenes 4 mm. long, 1.5 mm. wide; squamellae about 1 mm. long, more 
or less united. — Pl. Wright. i. 114 (1852) ; Hemsl. Biol. Cent.-Am. 
Bot. ii. 174. Northern Mexico. Specimens examined,-— Cerro de 
Pinal, Seemann, no. 1476 (type, in herb. Gray). SrvaLoa: Sierra de 
Choix, Goldman, no. 249. Teric: Palmer, no. 1857, coll. of 1892. 
5. Z. HELIANTHOIDES, Gray. Shrub or lignescent herb, 6 to 9 dm. 
high ; branches stout: leaves 2 to 10 cm. long, ovate, subcordate, serrate 
or subentire, reticulate-veiny, above warty-strigillose, beneath velvety- 
villous; petioles less than 1 cm. in length: peduncles 1 to 3 cm. long, 
very stout, fascicled or occasionally solitary at the ends of the branches; 
heads about 2 cm. long; involucre 10 to 15 mm. broad, its bracts about 
4-seriate, ovate, appressed, entire, rounded at the apex, the outer series 
considerably shorter than the inner: ligules 8 to 16, rather small ; disk- 
corollas long and slender, much exceeding the involucre: achenes 4 to 
6 mm. long, with margined angles much developed and confluent with the 
awns, these at least in the disk-achenes longer than the body of the 
achene. — Pl. Wright. i. 113 (1852); Hemsl. Biol. Cent.-Am. Bot. ii. 
172; Sch. Bip. in Seemann, Bot. Voy. Herald, 305. Z. ovata, Benth. 
& Hook. f. Gen. ii. 873 (1873). Lasianthus helianthoides, Zuce. in 
Herb. Acad. Monac. according to Gray, 1.c. Lasianthaea helianthoides, 
DC. Prodr. v. 608 (1836). Zithonia ovata, Hook. Bot. Mag. t. 3901 
