KOBINSON AND GREENi\lAN. — GENUS VERBESINA, 553 



acheues. — Ic. iii. 7, t. 214 ; DC. I. c. C13 ; Ilemsl. 1. c. 190; Klatt, 1. c. 

 92, but "angustissime alatis" can apply only to the very young achenes. 

 — ]\[exico, Guanajuato, Humboldt & Bonjiland, Duges, no. 469 ; Aguas 

 Calientes, Ilartweg, no. 115; Michoacan, Pringle, no. 4114; Hidalgo, 

 Prlngle, no. 6537; Monte de San Juan del Rio, Ihrlandier, 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 

 lude, Durango, Mexico, E. W. Nelson, 11-14 August, 1898, no. 4680. 

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



H- -t- Leaves opposite, serrulate. 

 ++ Leaves green and sparingly pubescent beneath : involucral scales obtuse. 



65. V. RESINOSA, Klatt, Leopoldina, xxiii. 144. — S. Mexico, Yavesia, 

 Llebmann, no. 331. Type in herb. Bot. Gard. Copenhagen; fragments 

 and a good sketch in herb. Gray. 



•w. ++ Leaves pale, tomentulose, and prominently reticulated beneath : involucral 



scales acute. 



66. V. Grayi, Benth. & Hook. f. ace. to Hemsl. 1. c..l88. Zexmenia 

 Grayii, Sch. Bip. in Seem. Bot. Herald, 305. — North Mexico, Sierra 

 Madre, Seeviann, 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 : leaves 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 ; petioles 7 mm. long: heads corym- 

 bose, 8 to 10 mm. in diameter; involucral scales about 2-seriate, oblong, 

 acute: rays about 6, oblong, yellow, 4 mm. long, half as broad; the 

 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. oncopliora ? 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. 

 The specific name is suggested by its dusty appearance. Type in herb. 

 Gray. 



