Vor. I] STEWART—BOTANY OF THE GALAPAGOS ISLANDS 207 
While it is difficult to give a list of plants which are strictly 
characteristic of this region, the following includes those spe- 
cies which are most common. Those which are followed by 
an asterisk in this and the following lists are, so far as is 
known, characteristic of the region to which they are referred. 
Acacia macracantha* Desmanthus depressus 
Aristida divulsa* Discaria pauctflora* 
subspicata* Erythrina velutina* 
Borreria ericaefolia* Euphorbia amplexicaulis* 
Bursera graveolens articulata* 
Castela galapageia viminea 
Cenchrus platyacanthus* Gossypium barbadense 
Cereus galapagensis* Lantana peduncularis 
nesioticus* Maytenus obovata 
sclerocarpus* Mentzelia aspera 
Clerodendron molle Opuntia galapageia* 
Coldenia Darwini* myriacantha* 
fusca* Parkinsonia aculeata* 
Cordia galapagensis Piscidia erythrina 
Hookeriana Prosopis dulcis 
lutea Scalesia atractyloides* 
Croton Scouleri* Telanthera echinocephala 
var. brevifolius nudicaulis 
var. Macraei* Waltheria reticulata 
Transition Region 
As the name would indicate, the vegetation in this region 
is transitional in character, being made up of a mixture of 
xerophytic plants from the dry region below and the more 
hardy of the mesophytic plants from the moist region above. 
There is usually a great thickening of the vegetation in this 
region, and a considerable number of the evergreen species 
appear, so that the landscape has a mottled appeardnce when 
seen from a distance. In fact the deciduous character of the 
vegetation in the dry regions, the evergreen character in the 
moist regions, and the mixture of the two in the transition 
regions, are the principal causes of the well marked appearance 
of zonation on many of the islands. 
The trees in this region are taller, as a rule, and closer 
together than they are in the dry region, while underneath 
the trees the bushes and undergrowth are larger and thicker 
on the ground. A few species of epiphytic plants are found, 
