A'o t] GRAY AND BOOKEB ON nil: BOCKY MOUNTAIN FLORA. 48 



been found in the Great Baain), and excepting the Tiquilia section of 



i nia. which extends to the northwestern verge of the interior \\ I 



Less region. The genera and species are fen in the Atlantic flora. h< 

 only characteristic genus is Onownodium : the yellow -flowered and showy 

 LithoHperma of the section Batsehia n shares with the plains. The 

 genus of the whole Rocky Mountain flora, though shared with the Pa 

 cine, is Eritrichium : the characteristic genusof the Pacific flora, of which 

 its neighbor takes a pan. is Amwnckio, Mertentia has most of its spe 

 cies in the Rocky Mountains and their accessories, yet the finest of them 

 is l/. Vinjinicit. peculiar to the Atlantic States. Pectooarya may have 

 been broughi from Chili to California. Some peculiar genera of the 

 Arixonian flora are hardly within our scope. 



Qokvqlvtjlag&m. — There are no peculiar genera in North America, 

 and nothing notable in distribution. There are many more Atlantic 

 than Pacific species. 



S. >i.ana< i;_i;. — As to truly indigenous species, are few north and east <>f 

 Texas, and not numerous through the western portions of the country. 

 I'hi/salis is the largest genus. The only peculiar genera are Chamcesa- 

 racka and the very little known Orjjctes. neither of salient character. 

 both of the interior region. Into the southern part of the Rocky Mount- 

 ains extend from .Mexico two species or forms of the Potato type; 



ScROPHi'LAitiACE^E. — North America has 37 indigenous genera oi 

 this very large order, several of them numerous in species. They are 

 fewest in the Atlantic flora, which yet has some peculiar genera, and it 

 is noteworthy that only one of them (SehweUbea) is of near affinity to 

 Japano-IIimalayan types. Throughout, the types which are not distinct- 

 ively American are rather European. Mi innliis. however, being an ex- 

 ception. Thus, in California there LS a remarkable development of the 

 genus AnUrrhinmm. Of the several tribes, there is one which is particu- 

 larly characteristic of the Atlantic flora, namely, that which contains 

 irdia of ores 20 species), and is augmented by Macrwnthera, s 

 ■. and Buchnera. Some species abound on the eastern part of the 

 plains, but none reach the Rocky Mountains or appear in the country 

 and them. Of genera which are sparingly represented in the At 

 lantic flora or near its borders, and are in feller strength westward, the 

 e characteristic are CdUirma^ and the great genus PewMemon^ with 

 about 4 Bpecies at the east and nearly 40 in the Pacific flora : Mimulus, 

 with ;; Atlantic and at least 23 Pacific species; Synthyris; <'<ishlhi,t. 

 with 3 "i 1 Atlantic and about 20 western species ; Ortkocarpus with one 

 a the northeastern plains and 24 in the western floras, chiefly 

 on the Pacific Bide, while its relatives in Cordylanthus add half a-; man> 

 more. Bo /< . withonlj 2 Atlantic species, increa ward 



( )i; - Wholly 



tinct from tin i ;>t for an Bastern 



izn ol Bosch n iak ia. i 



