118 PROF. T. H. HUXLEY ON THE GENTIANS. 
3. The Australasian, South Arctogeal, and Novo-Zelanian 
regions are all poorer in types. South Arctogwa contains only 
three, Lophanthe, Lissanthe, and Ptychanthe; Australasia two, 
Lophanthe and Lissanthe (perhaps Actinanthe); Novo-Zelania 
three, Actinanthe, Lophanthe, and Lissanthe. 
4. The Australasian and Novo-Zelanian provinces have very 
few species; in the Northern and Southern Arctogeal regions 
they are very much more numerous. Their numbers are greatest 
in Austro-Columbia. 
5. Only one species is certainly known to be common to any 
large extent of two provinces, namely Gentiana prostrata, which 
extends from the Eastern Alps of Europe, by way of Northern 
Asia and America, to the southern extremity of South America. 
6. The only types which certainly occur in all five regions are 
Lophanthe, Limnanthe, and Lissanthe. Actinanthe is known in 
three; namely the Northern Arctogzal, the Austro-Columbian, 
and the Novo-Zelanian. I think it probable, however, that it 
may yet be found in Australia. Keratanthe and Stephananthe 
occur in two, Northern Arctogea and Austro-Columbia; Pty- 
chanthe in three, Northern and Southern Arctogea and Austro- 
Columbia. 
7. Notwithstanding the general similarity of the climatal con- 
ditions in the mountain-chains of Northern Arctogea and Austro- 
Columbia, and the abundance of Gentians in both, their Gentian 
Flore are fundamentally different. In the Pyrenees, the Alps, 
and the Himalayas, the Ptychanthe type is largely represented in 
relation to the Actinanthe, Lophanthe, and Stephananthe types. 
In the Andes it is just the other way. Gentians of the Acti- 
nanthe and Lophanthe ty pes abound, and Stephananthe is well re- 
presented ; while I cannot make sure of more than six representa- 
tives of Ptychanthe, though this type is so easily recognized that 
there is little chance of its being overlooked or mistaken. Out of 
more than 60 species of South-American Gentiane, enumerated 
in Grisebach’s ‘Genera’ and Weddell’s ‘ Chloris,’ it appears that 
nine, namely, G. nitida, liniflora, inflata, thyrsoidea, crossolema, 
trichostemma, scopulosa, filamentosa, and Ringit, belong to Steph- 
ananthe, and six to Ptychanthe; while the rest all belong either 
to Actinanthe or to Lophanthe. Judging from the proportion of 
those which have examined, it seems. probable that there are 
nearly as many of Lophanthe as of Actinanthe. 
And when it is considered that only one species is common to 
