294 PROCEEDINGS OF THE AMERICAN ACADEMY. 



"Var. hypolencum. Leaves ovate-oblong, acuminate, glabrous 

 above, white-tomentose beneath, more or less glabrescent. — Collected 

 by C. G. Pringle, in canons near Guadalajara, 8 December, 1888, no. 

 2169, and on rocky banks of river below the Falls of Juanacatlan near 

 Guadalajara, 25 October, 1889, no. 2372, the latter distributed as Liabum 

 discolor^ Benth. & Hook. f. 



The companion number cited by Hemsley, Bourgeau, no. 1401, as 

 represented in the Gray Herbarium, shows an arachnoid pubescence still 

 adhering to the under surface of the leaves. Pringle's no. 2169 shows 

 the tomentum on the lower surface of the leaves to be evanescent ; this 

 number, however, certainly represents the same species as Pringle's 

 no. 2372, which has a dense tomentum on the lower surface of the 

 leaves. It seems best therefore to regard these two specimens collected 

 by Mr. Pringle as a tomentose variety of Liabum glabrujn, Hemsl. Mr. 

 Pringle's no. 6182, collected in the type locality, is probably more typical 

 of the species proper. 



++ ++ Involucral bracts acute : immature achenes setulose at the apex. 



L. sericolepis, Hemsl. 1. c. 



•i-H- Inflorescence in thyrsoid panicles, terminating the stems and branches : invo- 

 lucral scales lance-attenuate : pappus of uiicqual setas, not biseriate. 



Li. Klattii, Rob. & Greenm. Am. Jour. Sci. ser. 3, L. 156. 



.1- ^- •(- Heads few, large, 2 cm. or more in diameter : involucre multiseriate ; 

 scales lanceolate, acute : petioles short, about 4 mm. in length. 



L. Pringlei, Rob. & Greenm. Proc. Am. Acad, xxxii. 49, 



* * * Leaves sessile, linear or palmately lobed : heads discoid, few, on long pedun- 

 cles : involucral scales linear-attenuate : achenes sericeous. 



I- Leaves amplexicaul, palmately lobed. 



L. cervinum, Rob. Proc. Am. Acad. xxix. 317. 

 L. Palmeri, Gray, Proc. Am. Acad. xxii. 432. 



■*- H- Leaves linear, subverticillate. 



L. angustissinmm, Gray, 1. c. 



* * * * Species of doubtful aiBnity. 

 L. Liebmannii, Klatt, Leopoldina, xxiii. (reprint, p. 7). From the 

 very meagre characterization of this species it is impossible to give its 

 exact affinity without seeing Liebmann's specimen. 



