546 PROCEEDINGS OP THE AMERICAN ACADEMY. 



no. 461, Schaffner, no. 343 ; Durango, Palmer, no. 453, E. W. Nelson, 



no. 4564; Chihuahua, Pringle, nos. 1151, 1285; near Sta. Teresa, 



Tepic, Rose, no. 3397. This species differs from the preceding in its 



broader (oblong) less crowded leaves very different in pubescence and 



tending to be couduplicate along the midnerve. The range is also quite 



different. 



= = Stems narrowly winged : rays pale yellow. 



34. V. STENOPHYLLA, Greeum. Proc. Am. Acad, xxxii. 309, — Moist 



slopes above Cuernavaca, Morelos, altitude 2,000 m., Pringle, nos. 6503, 



6668. 



* * Leaves broader, lanceolate to ovate. 



1- Leaves coarsely dentate : Mexican. 



++ Leaves, at least in part, decurrent upon the stem. 



35. V. COAHUILEXSIS, Gray, 1. c. 14 ; Hemsl. I. c. iv. 57. — Coahuila, 

 9.5 km. east of Saltillo, Palmer, nos. 584, 619 ; Nuevo Leon, mountains 

 about Monterey, Prlngle, no. 2870. 



Var, viridior. Lower surface of the leaves green, scabrous-puberu- 

 lent iostead of canescent-tomentose as in the typical form. — Limestone 

 ledges, Carneros Pass, Coahuila, 12 August, 20 September, 1890, Prin- 

 gle, no. 3268. Type in herb. Gray. 



++ ++ Leaves sessile and auricled, but never decurrent. 



36. V. HYPOLECCA, Gray, 1. c. xv. 37, xix. 13; Hemsl. I. c. ii. 188. 

 — San Luis Potosi, Mexico, Parry &, Palmer^ no. 474, Schaffner, 

 no. 300. 



H- t- Leaves serrate or entire (serrate to coarsely dentate in the S. American 



T'. suhcordata). 



++ Perennial herbs or shrubs, with solitary heads and wingless stems : S. American. 



= Achenes narrowly winged. 



37*. V. Arxottii, Baker, 1. c. 215. V. helianthoides, Hook. & 

 Arn. in Hook. Jour. Bot. iii. 316, not Michx. V. Hookerii, Klatt, 

 1. c. XX. 92. — Paraguay at Asuncion, Gilbert, no. 1043: Argentine 

 Republic, Entre Rios, Tiveedie. 



= = Achenes broadly winged. 



a. Leaves opposite. 



38*. V. ASPiLioiDES, Griseb. Symb. Fl. Argent. 194. — Argentine 

 Republic in Pro v. Cordoba. 



