ROBINSON AND GREENMAN. —GENUS VERBESINA. 541 
576. — Valley of Mexico, Santa Fé, Bourgeau, no. 377, Tacubaya, 
Schaffner, no. 242; Durango, EZ. W. Nelson, no. 4600, Palmer, no. 318 
(coll. of 1896). 
* * * * Peduncles long and wingless; stems also wingless throughout. 
+ Species of Mexico and S. W. United States. 
++ Leaves chiefly opposite, very obtuse, narrowed to a distinct although winged 
pet : 
17. V. toncires, Hemsl. Biol. Cent-Am. Bot. ii, 188. — Mexico 
without locality, Coulter, no. 842. To this species we should refer 
Pringle’s no. 8215, collected on rocky hillsides, San José Pass, State of 
San Luis Potosi, 22 July, 1890. : 
++ ++ Leaves chiefly alternate, the upper lanceolate, narrowed to an obtuse apex, 
sessile by a somewhat contracted but auriculate-clasping base: involucral 
bracts narrowly oblong. 
18. V. Rothrockii. Stems erect, herbaceous, 6 dm. high, usually 
simple and 1-headed, terete, puberulent, scabrous, 1 to 4 from a thickish 
Woody stock: leaves oblong-obovate, crenate-dentate from below the 
middle, green and scabrous-pubescent on both sides, 5 to 8 cm. long, 
half as broad, amplexicaul by two broad basal auricles: peduncles long, 
naked, terminal, rarely branched: heads 1.5-to 2 cm. broad exclusive of 
rays; involucral scales about 2-seriate, not very unequal, oblong, obtuse, 
hirtellous to strigillose, the inner somewhat erose-dentate: rays 8 to 12, 
orange-yellow, 1.5 to 2 cm. long: achenes 7 mm. long, broadly winged, 
glabrous ; pappus obsolete. —V. Wrightit, Gray, Proc. Am. Acad. xix. 
12, in part, & Syn. Fl. i. pt. 2, 287, in part. Actinomeris Wrightii, 
Gray, Pl, Wright, ii. 89, not of Pl. Fendl.; Rothrock in Wheeler, Rep. 
vi. 162, t. 8; Hemsl. Biol. Cent.-Am. Bot. ii. 186, excl. pl. Texas. — 
os. Arizona, Camp Bowie, Dr. J. T. Rothrock, no. 452, Ojo de Gavilan, 
Thurber, no. 1058, foothills of the Sta. Rita Mts., Pringle; Arizona 
Without locality, Lemmon ; New Mexico, between the Copper Mines and 
Conde’s Camp, Wright, no. 1235; Coahuila, Palmer, nos. 585, 597, 598. 
e take pleasure in dedicating this species to Dr. Rothrock, who (1. ) 
first noted differences between this plant and the Texan species to which 
It has long been referred. 
“+ ++ ++ Leaves subsessile by a cuneate exauriculate base; the upper oval: 
involucral bracts broadly oblong. 
V. Lindheimeri. V. Wrightii, Gray, Proc. Am. Acad. xix. 1? 
rm 
19, 
(1883), in part, & Syn. Fl. i. pt. 2, 287, in part, not Griseb. (1866)- 
