GRAY ANH HOOKER <>\ mi: BOCCT MOUNTAIN FLORA. 31 



Poltg v!. \< 1:1: — Represented by PoJygala. The Atlantic flora La rich 

 in species, all of them peculiar: the Pacific flora lias only two. of a 

 peculiar type. The Texano-Arizonian region has several, some of them 

 Mexican, but from both the mountains and valleys of our bell the genus 



and the order are nearly absent. 

 Kk\mi:riaci:.i:. — Should be separately reckoned, whatever view be 



taken of the affinity of the warm-American (chielly Mexican) genus 

 K " ria. Dm 1 Bpecies reaches the plains of Arkansas, and has obtained 

 a Lodgment on the COasI Of Florida ; two or three more extend along the 

 M- rican frontier, but hardly infringe upon the region under consid- 

 eration. 



1 1; an k f.n 1 \o:.\:. — Of a single genus, of warm temperate and subtrop- 

 ical coasts: has a Galifornian and Arizonian Species; no Atlantic repre- 

 sentative, but there is a quite peculiar species at the southeastern base 

 of the Rocky Mountains. 



i:\opnYLLACEJE. — The Silcnccv are feebly represented (by Silene 



only) in the Atlantic flora, yet by peculiar species; are nearly wanting 



from the Great Plains, scanty in the Eocky Mountains, but of increas- 



amber and diversity as the Pacific' flora is approached. The Al- 



1 . moderately numerous, call for no remark, except for the increased 



number of species of Armaria in the interior flora, most of them peculiar. 



Stipulicida is of a single strictly Atlantic species. 



Illecebraceje. — Xowhere very numerous, but most of the species and 



1 a in the Old World. Paronychia is represented in the Atlantic 



flora ; also in that of the plains and the eastern part of the Pocky 



Mountains. Anyehia and Siplionycliia are peculiar to the Atlantic flora; 



"■<( ,u\ to that of the Pacific coast, extending to Chili. Achyronychia^ 



a remarkable genius, of one species, belongs to the Arizonian rather 



than the California flora. 



PoKTt'LACACA.E. — This may be regarded as an American order, al- 

 though the Purslane has accompanied man all over the world. The 

 single species of Montia has an immensely wide distribution over the 

 OOOl parts of the world. One of Claytonla and several of Calandrinia are 

 Australian, and two small genera are South African. So, as relates t<> 

 distribution, it is a very suggestive order. The Atlantic States have 

 only the two earliest known species of Glaytonia and a Talinum; New 

 Mexico has a peculiar genua [TaHnoptis), too like an African one; the 

 Rocky Mountain region has the characteristic and remarkable genus 

 . and more species of OlaytoniOj &c ; Spraguea and Calyptridium 

 are peculiar to the whole country wesl of the Rocky Mountains proper; 

 vdrinia are all western; and the Pacific flora contains most of the 

 of Glaytonia. 



\« i:.i.. — Two <>f our three species of J'i"f>i>< occur in the At- 

 lantic, Rocky Mountain, and Pacific floras; <>nr 1- restricted to the 

 latter The Texan Bergia very sparingly occurs in the Great Basin and 

 ■ be Pacifi* 



