JONES. — A REVISION OP THE GENUS ZEXMENIA. 167 



Z. helianthoides, Benth. & Hook. f. Gen. ii. 371 (1873), is better re- 

 stored to Wedelia helianthoides, HBK. 



Z. Lindenii, Sch. Bip. in Seemann, Bot. Voy. Herald, 306 (1852-57). 

 Lasianthaea Lindenii, Sch. Bip. 1. c. " Foliis alternis ab omnibus differt, 

 3h poll, longis, f-1 poll, latis, elliptico-lanceolatis, utrinque attenuatis, 

 petiolatis, serratis, penninerviis, supra asperis, infra tomentosis, corymbo 

 polycephalo (floribus flavis : Linden)." This inadequately characterized 

 plant has not been identified among the specimens examined. 



Z. longipes, Klatt, Bull. Soc. Bot. Belg. xxxi. 202 (1892) and xxxv. 

 287 (1896), as to Pittier's nos. 4365, 6961, and 6991, is referred with 

 some doubt to Wedelia Jilipes, Hemsl. 



Z. ovata, Benth. & Hook. f. Gen. ii. 373 (1873). Tithonia ovata, 

 Hook. Bot. Mag. t. 3901 (1842). This plant is exactly Z. helianthoides, 

 Gray. 



Z. reticulata, Benth. & Hook. f. Gen. ii. 373 (1873), is better restored 

 to Wedelia. 



Z. scandens, Coulter in J. D. Smith's Enum. PI. Guat. iv. 86 (1895), 

 is probably Perymenium Nelsonii, Robinson & Greenman. 



Z. stenantha, Hemsl. Biol. Cent. -Am. Bot. ii. 174 (1881), is Z. crocea, 

 Gray. 



Z. tagetiflora, D. Don ex Sweet, Hort. Brit. ed. 2, p. 309 (1830), is a 

 name only. 



Z. tequilana, Gray, Proc. Am. Acad. xxii. 425 (1887), is Otopappus 

 aciiminatus, Wats. 



Z. trachylepis, Hemsl. Biol. Cent.-Am. Bot. ii. 175 (1881), is not 

 satisfactorily distinguishable from Z. scandens, Hemsl. 1. c. 174. 



Z. villosa, Polak. Linnaea, xli. 579 (1877), was based on a Costa 

 Rican plant, described as having the involucre 2 cm. broad. It is be- 

 lieved that a part of the type-material was deposited in the herbarium of 

 the Royal Botanical Museum at Berlin, but Professor Urban, who has 

 kindly made a search for it, writes that it is not to be found under Zex- 

 menia. It is probable, therefore, that it has been found to belong else- 

 where and has been removed to some other genus. 



