of the Galapagos Archipelago. .249 



2. Orders whose Galapageian species are American solely : — Xanthoxylece, a 

 West Indian species ; Simaruhece, the West Indian Castela Nichohonii ; Vm- 

 belliferce, 2 Helosciadia ; Lobeliacece, the Mexican L. Xalapends ; Apocynece, 

 the West Indian l^allesia glabra, Lk. ; Plantuglnece, the Chilian P. tomentosa ; 

 Phytolaccece, P. decandra ; Chenopodice, Cryptocarpus and Boussingaultia ; 

 Hypoxidece, H. erecta, Willd. 



3. Orders containing only such Galapageian species as are confined to that 

 group : — Polygalece, 2 species ; Byttneriacece, a new fValtheria ; Celastrince, 

 a new plant of the American genus Maytenus ; Rhamnece, a Discaria allied to 

 a Chilian species ; Myrtacea:, a Psidium ; Cucurbitacece 2 ; Cactece, a Ceretis 

 and Opuntia, the latter one of the largest of the order ; Passiflorece, 3 new 

 species allied to West Indian congeners ; Loasece 1 ; Portulacece, a new genus 

 and a new species of Sesuvium ; Loranthece 2 ; Piperacece, 3 very distinct 

 species of Peperomia ; Orchidece, an epiphytical Epidendrum. 



4. The other orders are : — Malvaceae 4, including 2 Sidce, considered as 

 new, but possibly altered states of continental species ; Convolvulaceoe, 4 spe- 

 cies, two belonging to the first of the foregoing divisions, one to the second, and 

 three, a Cuscuta and two Ipomcew, to the third. Verbenacece 9 ; two belonging 

 to the first division, and the rest (except possibly two which are indetermi- 

 nable) to the second ; Labiatae 5, one to the first division, three to the second 

 and one to the third ; Scrophularince, the ubiquitous tropical Scoparia dulcis, 

 and an indeterminable, probably new plant ; Boraginece, a new genus, Gala- 

 pagoa, with two species, the wandering Heliotropium Curassavicum, two new 

 Toumefortice and two South American plants ; Acanthacece, Dicllptera Peru- 

 viana, and a new Tetramerium; Nyctaginece, an undescribed Pisnnia, and four 

 very widely distributed Boerhaavice ; Urticece 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 bB compared 

 with the Galapagos, (as New Zealand, the Sandwich group, Juan Fernandez 

 and St. Helena,) are, 1st, That there are points of agi cement inexplicable in 

 our state of knowledge ; such are the peculiarities of Rubiacece and of frutes- 

 cent and arborescent Compositce ; which is rendered the more remarkable from 



