ROBINSON AND GREENMAN.— GENUS VERBESINA. 553 
achenes. — Ic. iii. 7, t. 214; DC. 1. c. 613; Hemsl. 1. c. 190; Klatt, l.c. 
92, but “angustissime alatis” can apply only to the very young achenes. 
— Mexico, Guanajuato, Humboldt & Bonpland, Dugés, no. 469 ; Aguas 
Calientes, Hartweg, no. 115; Michoacan, Pringle, no. 4114; Hidalgo, 
Pringle, no. 6537 ; Monte de San Juan del Rio, Berlandier, no. 1289. 
~ Var. Pringlei. Leaves ovate-oblong, coarsely and irregularly ser- 
rate, papillose-scabrous above, pubescent and subcinereous beneath : 
pales long, recurved, considerably exceeding the mature achenes. — V. 
Pringlei, Robinson, Proc. Am. Acad. xxvii. .175.— Barrancas near 
Guadalajara, Jalisco, Pringle, no. 3845. 
~ Var. amphichlora. Leaves lance-ovate, finely appressed-pubescent 
and bright green upon both surfaces.— Collected between Ramos and 
Inde, Durango, Mexico, Z. W. Nelson, 11-14 August, 1898, no. 4680. 
Types in herb. Gray and herb. U. S. Nat. Museum. 
+ + Leaves opposite, serrulate. 
++ Leaves green and sparingly pubescent beneath: involucral scales obtuse. 
65. V. rEstNosA, Klatt, Leopoldina, xxiii. 144.——S. Mexico, Yavesia, 
Liebmann, no. 331. Type in herb. Bot. Gard. Copenhagen ; fragments. 
and a good sketch in herb. Gray. 
++ ++ Leaves pale, tomentulose, and prominently reticulated beneath: involucral’ 
ales acute. 
66. V. Gray, Benth. & Hook. f. ace. to Hemsl. 1. c. 188. Zeamenia 
_ Grayii, Sch. Bip. in Seem. Bot. Herald, 305.-— North Mexico, Sierra 
Madre, Seemann, no. 2004. 
++ ++ ++ Leaves canescent-tomentose beneath without prominent reticulation: 
involucral scales acute to acuminate. 
67. V. molinaria. Branches terete, canescent with an. almost mi- 
croscopic appressed pubescence: léaves opposite, oblong-lanceolate, acu- 
minate at each end, serrulate, pinnately veined, pale green and slightly 
scabrous-puberulent above, canescent and silky-tomentose beneath, 1.2 
to 1.4 dm. long, 3 to 3.7 cm. broad; petio] »s 7 mm. long: heads corym- 
bose, 8 to 10 mm. in diameter; involucra} scales about 2-seriate, oblong, 
acute: rays about 6, oblong, yellow, 4 mm. long, half as e 
tubular portion pubescent: pales oblong, subtruncate, apiculate: achenes 
of the disk-flowers 2 to 3 mm. long, puberulent, moderately winged on 
both edges: pappus of two short awns. —V. oncophora? Greenm. Proc. 
Am. Acad. xxxii. 309. — Under bluffs of a barranca above Cuernavaca, 
Morelos, altitude 2,000 m., 1 November, 1896, C. G. Pringle, no. 6600. 
ed specific name is suggested by its dusty appearance. Type in herb. 
ray 
