36 PROCEEDINGS OF THE AMERICAN ACADEMY. 



rameum molliter hirsutum, pilis longis patentibus plus minusve monili- 

 formibus albis viseidulis inaequalibus ; foliis oppositis deltoideis vel 

 ovato-deltoideis longe petiolatis late cordatis grosse duplicateque cren- 

 ato-dentatis tenuibus utrinque praesertiin subtus in nervis pubescenti- 

 bus, limbo 11-12 cm. longo 8-10 cm. lato, petiolo sursum alato ca. 7 cm. 

 loiigo birsuto ; pauicula oppositiramea ; capitulis ca. 11-lioris 10-11 mm. 

 longis 4-5 mm. diametro ; pedicellis gracilibus rectis valde inaequalibus 

 2-12 mm. longis ; involucri squamis lanceolatis attenuatis peracutis 

 3-4-seriatis valde imbricatis viridibus albo-nerviis hispidulis adpressis ; 

 corollis angustissime tubulosis 3.5 mm. longis viridiscenti-albidis, 

 faucibus vix ullis; dentibus limbi brevissimis erectis ; styli ramis valde 

 exsertis aurantiacis vel maturitate brunnescentibus valde clavatis ; 

 achaeniis fuscis prismaticis 2.7 mm. longis deorsum modice angustatis 

 basi callosis plus minusve curvatis in faciebus et in costis sursum his- 

 pidulis ; pappi setis inaequalibus ca. 20 vix scabratis laete albis co- 

 rollam fere aequantibus. — On shaded cliffs of limerock, Sierra Madre, 

 above Monterey, Mexico, 1000 m. alt., 16 July, 1906, C. G. Pr ingle, no. 

 10,259 (type, in hb. Gray). This species is closely related on the one 

 hand to E. chrysostylimi Robinson and on the other to E. Parryi Gray. 

 From the former it differs in its more slender freely branched less pu- 

 bescent stems, large bluntly toothed leaves and much longer pedicels. 

 From E. Parryi it differs in having much larger leaves (of which 

 even the uppermost are opposite), winged petioles, and smaller fewer- 

 flowered heads. 



Eupatorium thyrsiflorum (Greene) Robinson, n. comb. Kyrstenia 

 thyrsijiora Greene, Leatl. i. 9 (1903). The genus Kyrstenia Neck. 

 does not seem to the writer in any way satisfactorily separable from 

 Eupatorium. When all species are duly considered the two groups 

 appear to merge by imperceptible gradations. There seems, however, 

 to be little doubt that Professor Greene's K. thyrsijiora is specifically 

 distinct and may be appropriately transferred to the older genus. 

 From the more typical material of the species, with leaves in varying 

 degree toothed and somewhat narrowed at the base, the following plant 

 may be varietally separated. 



Var. holoclerum Robinson, n. var., foliis ovatis integris vel obsolete 

 crenato-serratis basi fere rotundatis. — Near the city of Durango, 

 Mexico, April to November, 1896, Dr. E. Palmer, no. 755 (type, in hb. 

 Gray). Distributed as E. occidentale, var. arizonicum Gray. 



Eupatorium triangulatum Alam. ex DC. Prod. v. 172 (1836). After 

 a careful examination of the types of this species in the DeCandoUean 

 herbarium at Geneva, and of E. ruhricaule HBK. at the Museum of 

 Natural History at Paris, the writer can find no differences of moment. 



