34 ROBINSON 
or arborescent species with prevailingly oblong feather-veined bullate- 
rugulose leaves of peculiar texture, a group of xerophytes tending to 
viscidity and passing through such species as FE. Ballii, E. Cursonii, 
E. Volkensii, and E. chotense into a small group of linear-leaved 
species, such as E. Gayanum and E. lavandulaefolium. 
2) That portion of § Subimbricata which includes E. elatum, E. 
trinitense, E. turbacense, E. tovarense, and E. Sprucei, species char- 
acterized by attenuate style-branches and lance-oblong feather- 
veined leaves. (For a discussion of this series see Proc. Am. Acad. 
lv. 33-34.) 
3) The peculiar little. group represented by E. origanoides, E. niv- 
eum, and E. leucophyllum, species with the leaves whitened beneath. 
4) Those species of § Eximbricata with prevailingly elliptical cori- 
aceous and finely reticulated leaves, namely such species as E. fasti- 
giatum, E. exserto-venosum, E. umbrosum, E. cotacachense, and E. 
elegans. 
The complete absence of these groups, elsewhere, often conspicuous 
elements in the other Andean floras, is not easily explained with our 
still exceedingly imperfect knowledge of the soil-relations and eco- 
logical conditions of Bolivia. 
As to the different sections of the genus Eupatorium represented 
in Bolivia it may be observed that §§ Cylindrocephala, Subimbricata, 
and Eximbricata are hete as elsewhere the prevalent groups and that 
they occur-in about the same proportion as in Peru. As in other 
regions the separation of §§ Subimbricata and Eximbricata is in Bolivia 
difficult. and obviously artificial. Even §§ Cylindrocephala and 
Praxelis appear so nearly confluent that certain species might with 
almost equal propriety be placed in either. The little § Prazelis is 
more than usually well represented, having no less than five species of 
which three are endemic. The §§ Conoclinium and Campuloclinium 
have only one Bolivian member each—in both instances species of 
wide range by no means peculiar to the country. : 
Baker’s very weak sectional proposition Urolepis is represented in 
Bolivia by both of the species originally referred to it, namely F. 
hecatanthum and E. trichobasis. It was distinguished by Baker 
-chiefly on account of the caudate appendages of its involucral scales. 
This feature, conspicuous in E. hecatanthum, is obscure in E. tricho- 
basis. The two show in other respects no marked similarity and are 
far from constituting a consistent or well marked section. 
have hairy receptacles and may be logically merged with § Hebecli- 
nium, 
