(.KAY AND HOOKEB <>N THE B0CKY MOUNTAIN FLORA. 33 



or three species on the Pacific side, the reduced type Ffarkea on the 

 Atlantic side also; all wanting to 1 1 1 * - Roeky Mountain flora. 



o\ u liw 1 . — A \erv tew species of o.Kiiis. one peculiar t<> the < i ast 

 and one t«> the west, one t<> the east and middle, and the 0. cornioulata 

 both east and w< 



BALS v minim:. — TWO Spociesof TmpatU fU in the Atlantic States; none 



farther westward. 



RuTACRfi. — Mainly a tropical and subtropical order and not largely 

 American, it is only to be noted that tin- EutecB are represented along 

 the southern border by Thamnosma^n Texan species of which reaches the 

 southern Rocky Mountains, and another belongs only to the southern 

 border of the Great Basin. PteUa extends quite across the continent, 



whether in one or in three species is uncertain: and tWOSpecieSOf Xam- 

 '"in are restricted to the Atlantic border. Cneoridium is a little 

 Galifornian shrub which rather belongs to this order. The American 

 Siinarubacea- are south of our range. 



(\ 1:11.1.1:1:. — Two strictly Atlantic genera, one tropical American 

 and a West Indian one. compose the group. 



A> a ifui.iack.i; are represented only in the Atlantic flora by a dozen 

 species of Ih.nxml the peculiar monotypic genus Nermpanthes. 



< ki.astkacim:. — The single Celastvm ifi restricted to t^he Atlantic 

 flora, which has also two species of Euonymus: the Pacific coast lias 

 one. Pachyatima is a genus of two species, one common through the 

 mountains from the Pacific to the Rocky Mountains, the other extremely 

 local in the AUeghanies of Virginia. 



Kiiamna<i:.i:. — Excluding the Tcxano-Arizonian forms and the sub- 

 tropical of Florida, we are concerned only with Rhammu and Fi/tin/nla, 

 one species of which crosses the continent northward, two Atlantic only, 

 and two Pacific; Sagerctia and Berehemia, eaeh having one Atlantic 

 : species; and the great American genus Geanothus. The original 

 es and three others an- restricted to the Atlantic flora: three are 



Mexican; but the rest, twenty or more species, belong to the Rocky 

 Mountains, where there are few, and to the Pacific flora, where they aire 

 perhaps the most abundant ami characteristic shrubs, forming a large 

 part <>f the chaparrdL 



Vn \( ]..].. — Ampriopsis belongs to the Atlantic flora, but reaches the 

 south. -hi Rocky Mountains. VUis has eight or nine species, in the same 

 flora, and i- therefore more developed here than in any other part of the 

 temperate zone. California has one species; the Rocky Mountains and 



their OUtlj ing distl i<-t < none at all. 



3apindagbjb. — Most largely tropical, except that there is a 8api\ 

 along the southern frontiers; are represented only by certain genera. 



characterize the Atlantic flora; one, ofadif- 

 ii type, tin- Pacific flora ; and there is none between. Five sp 

 <»i J leculiar t«> tin- Atlantic, two to the Pacific flora : one o 



only in the western Rocky Monnt common t<> tie- lattei 



• b 



