544 PROCEEDINGS OF THE AMERICAN ACADEMY. 



* * Pales linear-oblong, entire or 2-3-toothe(l : annuals. 

 -1- Aclienes broadly winged from the summit to the base. 



29. V. ENCELioiDES, Benth. & Hook. f. Leaves appressed-pubescent 

 but green above ; petioles (at least of the upper leaves) provided on each 

 side with a wing which broadens towards the base into a semi-ovate 

 incised stem-clasping auricle : outer involucral scales long, green, much 

 surpassing the disk : wings of the achene rather broad, acutish at the 

 apex. — Benth. & Hook. f. ace. to Gray, Bot. Calif, i. 350 ; Gray, Syn. 

 FL i. pt. 2, 288, in part. Xivienesia encelioides, Cav. 1. c. ; DC. 1. c. 



— Florida, CuHiss, nos. 1503, 5650, Palmer, no, 291 ; Texas, Heller, 

 no. 1785 ; Mexico, San Luis Potosi, Parry & Palmer, no. 468, State of 

 Tamaulipas, Victoria, i^. W. Nelson, no. 4425; Cuba, Wright, no. ZQW. 

 Naturalized in the warm parts of the Old World and cultivated in a broad- 

 leaved form (^Ximenesia encelioides, var. hortensls, DC. 1. c). 



Var. cana. More canescent throughout, even the upper surface of 

 the leaves usually whitish with copious ai^pressed pubescence : involucral 

 bracts shorter, subequal. — Ximenesia encelioides, var. 8 cana, DC. 

 1. c. ; Gray, PI. "Wright, ii. 92. — Texas, Laredo, Berlandier, nos. 2068, 

 2074; S. W. Texas, Wright, no. 352, Palmer, no. 617; New Mexico, 

 Fendler, no. 421; Cuba, Combs, no. 577; Hawaiian Isls., Hillehrand. 



Var. exauriculata. Pale green annual : petioles entirely naked and 

 slender or rarely the upper bearing a divaricate usually oblong subentire 

 lobe on each side of the base: scales of the involucre subequal, scarcely 

 or not at all surpassing the disk : wings of the achene broad, corky, ob- 

 tuse at the apex. — V. ericelioides, Gray, Syn. Fl. i. pt. 2, 288, in part ; 

 Hemsl. 1. c. Ximenesia encelioides, Rothrock in Wheeler, Rep. vi. 163. 



— Kansas, Hitchcock, no. 277 ; Colorado, in the Arkansas Valley near 

 Pueblo, Greene, Colorado Springs, Miss Mulford ; Arizona, on the Little 

 Colorado, Sitgreaves Exp., Thurher, no. 667, Rothrock, no. 772, 

 Pr ingle; Mexico, Coahuila, Palmer, no. 2064, Sonora, Hartman, no. 

 229, without locality, Rose, no. 3076. 



-f- -t- Achenes narrowly winged or only winged near tlie summit. 



30. V. AUSTRALis, Baker in Mart. Fl, Bras. vi. pt. 3, 215. Xime- 

 nesia micro2)tera, DC. I.e. ; Hook. & Am. in Hook. Jour. Bot. iii. 316; 

 Griseb. Symb. Fl. Argent. 195. X. australis, Hook. & Arn. in DC. 

 1. c. vii. 291. — South America, Buenos Ayres, Bade ; Concepcion del 

 \jT\x^&j, Lorentz ; Central Paraguay, Jlfo^'ow^, no. 98 ; Bolivian Pla- 

 teau, Bang, no. 1003 ; also N. E. Mexico at Matamoras, Berdandier, 

 no. 2286. From description we cannot separate V. aurita, Philippi, 

 Ann. del. Mus. Nat. Chile, Bot. 1891, p. 48. 



