® 
294 PROCEEDINGS OF THE AMERICAN ACADEMY. 
Var. hypoleucum. Leaves ovate-oblong, acuminate, glabrous 
above, white-tomentose beneath, more or less glabrescent. — Collected 
ringle, in cafions near Guadalajara, 8 December, 1888, no. 
2169, aud 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 glabrum, 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. 
++ Inflorescence in thyrsoid panicles, terminating the stems and branches: invo- 
lucral scales lance-attenuate : pappus of unequal sete, not biseriate. - 
L. Klattii, Rob. & Greenm. Am. Jour. Sci. ser. 3, L. 156. 
+++ 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. 
+ Leaves amplexicaul, palmately lobed. 
L. cervinum, Rob. Proc. Am. Acad. xxix. 317. 
L. Palmeri, Gray, Proc. Am. Acad. xxii. 432. 
+ + Leaves linear, subverticillate. 
L. angustissimum, Gray, I. c. 
* « * * Species of doubtful affinity. 
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. 
