534 PROCEEDINGS OP THE AMERICAN ACADEMY. 



the Sierra Madre, near Monterey, Nuevo Leon, Pringle, nos. 2222, 

 2412. Type in herb. Gray. This species is reported by Mr. J. Don- 

 nell Smith (Intercont. Ry. Comm. i. pt. 2, append. 3, 12) as collected at 

 Calel, Guatemala, but from the extraordinary extension of range we are 

 forced to doubt the identity of the Guatemalan plant (which we have not 

 seen) with the North Mexican species. 



* * Rays none. 



12. Z. DiscoiDEA, Gray. Stem simple, erect, 7 dm. high, canescent- 

 tomentulose : leaves round-ovate, crenate-dentate, scarcely acute, pale 

 green above, white-tomentose beneath, 9 cm. long, 8 cm. broad, truncate 

 or subcordate at the base but cuneate at the insertion of the petiole (1 to 

 1.4 cm. long) : heads numerous, small, in a dense almost naked terminal 

 corymb. — Proc. Am. Acad. xxi. 388. — Rocky hills near Chihuahua, 

 Pringle, no. 309 ; along road between Cerro Prieto and La Providencia, 

 State of Durango, 11 September, 1898, E. W. Nelson, no. 4970. Type 

 in herb. Gray. 



IL — SYNOPSIS OF THE GENUS VERBESINA, WITH AN 

 ANALYTICAL KEY TO THE SPECIES. 



By B. L. Robinson and J. M. Greenman. 



The genus Verhesina has not been revised as a whole since its treat- 

 ment in the fifth volume of the Prodromus (1836). In this work 

 DeCandolle describes 33 species with definiteness and appends 8 more 

 indefinitely as " non satis notse." All but 2 of these 41 species were 

 American. DeCandolle divides the genus into three sections : Verhesi- 

 naria with radiate heads and straight pappus-awns, Hamulium with 

 radiate heads and uncinate awns, and Platypteris with discoid heads. 

 In 1883, Dr. Gray (Proc. Am. Acad. xix. 11-15) synopsized the North 

 American, West Indian, and Mexican forms known to him, adding to 

 the sections Ximenesia with loose herbaceous involucre, and Pterophy- 

 ton, including a part of DeCandoUe's Verhesinaria and most of the 

 obscurely distinguished genus Actinomeris. From 1883 to 1889, Dr. 

 Klatt (Leopoldina, xx.-xxv.) characterized many species and sought to 

 disentangle the synonymy. In the second volume of Hemsley^s Biologia 



