ROBINSON AND GREENMAN. — GENUS VERBESINA. 549 



++++++ -M- -i-h Stem mostly provided with narrow or broad herbaceous wings : tall 

 herbaceous species of the United States. 



= Wings of the achene very narrow or obsolete : leaves ovate, opposite : heads 

 rather small and few-flowered. 



49. V. occiDENTALis, Walt. Fl. Car. 213 (1788); Gray, Syn. Fl. i. 

 pt. 2, 287, q. V. for rather extensive synonymy. — Woods, etc., Pennsyl- 

 vania to Florida ''and Illinois" (doubted). 



= = Wings of the achene broad : leaves chiefly alternate : heads rather large, 

 numerously flowered : rays long. 



50. V, HELiANTHOiDES, Michx. Fl. ii. 135 ; Gray, Syn. Fl. i. pt. 2, 

 288. Actinomeris helianthoides, Nutt. Gen. ii. 181 ; DC. Prodr. v. 575, 

 vii. 290, iucl. formal vars. Nuttallii and Elliottii. ?A. oppositifolia, DC. 

 1. c. vii. 290 (opposite-leaved form). — Open woods, etc., Ohio to Iowa, 

 Georgia, and Texas ; common. 



§ 9. Saubinetia {Saublnetia, Remy in Gay, Fl. Chil. iv. 284, ex- 

 tended). Heads as in the last or smaller : i-ays present, yellow (rather 

 pale in V. holiviana, of uncertain color in V. guatemalensis), short, little 

 exserted : leaves oblong or ovate to lanceolate, not lobed (except some- 

 times in V. boliviand). 



* Stem wingless : leaves sessile and biauriculate or borne on winged biauriculate 

 petioles; auricles (narrow and sometimes obscure in V. oreopola) herbaceous, 

 continuous with the blade, neither deciduous nor decurrent. 



•<- Leaves ovate or ovate-lanceolate, narrowed to winged auriculate petioles : 



S. American. 



51. V. BOLiviANA, Klatt, Ann. Naturh. Hofmus. Wien, ix. 361 (1894). 

 V. Bridgesii, Rusby, Mem. Torr. Club, iv. 212 (1895). — Andes of Bo- 

 livia, Cuming, near Cochabamba, Bang, no. 974. Rays pale yellow. 



•t- •<- Leaves oblong, sessile, more or less auriculate or amplexicaul : Mexican. 

 ++ Leaves green and glabrous beneath. 



52. V. Nelsonii, Rob. & Greenm. Proc. Am. Acad, xxxii. 46. — 

 Mountains of Guerrero between Ayusinapa and Petatlan, altitude 1,500 

 to 2,100 m., 14 December, 1894, E. W. Nelson, no. 2118. Types in 

 herb. Gray and herb. U. S. Nat. Museum. 



++ -M- Leaves pubescent to canescent-tomentose beneath. 

 — Involucral scales lanceolate, acuminate. 



53. V. POTOSiNA, Rob. Proc. Am. Acad, xxvii. 175. — San Luis 

 Potosi, mesas at Hacienda de Angostura, Pringle, no. 5113. 



