258 APPENDIX. 



species are endemic. Two genera belong to the tribe Eucyrtandreee, one of them being 

 chiefly Asiatic. Nearly all are herbs with showy brightly coloured flowers. 



Labiatce. 



The enormous development in Mexico of the widely-spread genus Salvia is the most 

 striking feature in this order. It is the third from the largest genus in our flora, and 

 the species are perhaps better defined than those of the genera surpassing it in number. 

 It is noteworthy that only two genera out of twenty-nine are endemic, and of these 

 Dekinia is obscure, and we probably have it under some other name. Eleven of the 

 genera range widely and three others extend beyond America. Hyptis, a genus of 

 about 250 species, all of them American, and four or five of them now more or less 

 widely spread in other warm countries, though probably of American origin, is also 

 strongly represented ; but about 200 of the species inhabit Brazil. Many of the southern 

 species are shrubby and two or three of them trees thirty to forty feet high, and the 

 largest members of the order in the world. 



Acanthacece. 

 Eleven out of thirty-eight genera are endemic ; fourteen others are restricted to 

 America ; eleven are widely dispersed ; Siphonoglossa is common to South Africa, and 

 one species of Tetramerium inhabits the Galapagos. Upwards of two thirds of the 

 species are endemic, and only one, Nelsonia campestris, is found out of America, and 

 this is almost cosmopolitan in the tropics. 



Nyctaginece. 

 Twenty-five genera are referred to this order, two of them founded since the publication 

 of Bentham and Hooker's 'Genera Plantarum;' one of them, however, is described as 

 anomalous. Except this, which is African, and Timeroya, a New-Caledonian genus, all 

 of the genera are American, and all save three endemic ; hence the order may be regarded 

 as specially American. Pisonia, a large genus of trees and shrubs, is widely diffused, 

 as also the herbaceous Boerhaavia, and one species of Occybaphus is endemic in the 

 Himalayas. The total number of species has been estimated at 215; sixty of them 

 belonging to Pisonia and thirty to Neea, of which we have seen only fragmentary speci- 

 mens of two or three species from within our limits. Fourteen genera, two endemic, and 

 fifty-four species, twenty-three of which are endemic, are noted from Mexico and Central 

 America, but by far the greater part from Mexico. Of the remaining twelve genera 

 nine are restricted to America^and eight of them extend into western North America 

 as against three into eastern. Eight of the western genera are peculiar to the region ; 

 that is to Texas and westward and northward. And we have thirty-six species, belonging 

 to nine genera, from North Mexico. Here, then, in North Mexico and Texas to Arizona 



