of the Galapagos Archipelago. 249 
2. Orders whose Galapageian species are American solely :—Xanthorylew, a 
West Indian species; Simarubec, the West Indian Castela Nicholsonii ; - Um- 
bellifere, 2 Helosciadia; Lobeliacee, the Mexican L. Xalapensis ; Apocynee, 
the West Indian Vallesia glabra, Lk.; Plantagineæ, the Chilian P. tomentosa ; 
Phytolaccee, P. decandra; Chenopodie, Cryptocarpus and Boussingaultia ; 
Hypoxidece, H. erecta, Willd. 
-. 8. Orders containing only such Galapageian species as are confined to that 
group :—Polygalew, 2 species; Byttneriacew, a new Waltheria ; Celastrine, 
a new plant of the American genus Maytenus; Rhamnec, a Discaria allied to 
‘a Chilian species; Myrtacew, a Psidium; Cucurbitacece 2 ; Cactec, a Cereus 
and Opuntia, the latter one of the largest of the order; Passifloree, 3 new 
species allied to West Indian congeners; Loasec 1; Portulacee, a new genus 
and a new species of Sesuvium; Loranthee 2; Piperacee, 3 very distinct- 
species of Peperomia; Orchidee, an epiphytical Epidendrum. 
4. The other orders are :—Malvacee 4, including 2 Side, considered as 
new, but possibly altered states of continental species; Convolvulacec, 4 spe- 
cies, two belonging to the first of the foregoing divisions, one to the second, and 
three, a Cuscuta and two Ipomee, to the third. Verbenacee 9; two belonging 
.to the first division, and the rest (except possibly two which are indetermi- 
nable) to the second; Labiate 5, one to the first division, three to the second 
and one to the third ; Scrophularine, the ubiquitous tropical Scoparia dulcis, 
and an indeterminable, probably new plant; Boraginee, a new genus, Gala- 
pagoa, with ‘two species, the wandering Heliotropium Curassavicum, two new 
Tournefortice and two South American plants; Acanthacee, Dicliptera Peru- 
viana, and a new Tetramerium; Nyctaginee, an undescribed Pisonia, and four 
very widely distributed Boerhaavie ; Urticee 5, all common South American 
plants, one of which, Pilea peploides, is also found in the old world. 
The general results of this'summary of the orders, and of the comparison of 
these and of the species with those of the continent of South America and the 
other islands, which in peculiarity of flora for their size may be compared 
with the Galapagos, (as New Zealand, the Sandwich group, Juan Fernandez 
and St. Helena,) are, 1st, That there are points of agreement inexplicable in 
our state of knowledge; such are the peculiarities of Rubiacee and of frutes- 
cent and arborescent Composite ; which is rendered the more remarkable from 
