CJRAV am> BOOKEH OH i;n ROCK! MOUNTAIN FLORA 



and Central Asia, where a great majority of the rest of the Astragalea 

 flourish. Amorpka is shared by the Atlantic and Pacific floras. Ther- 

 v. with three local Atlantic species, one in the Rocky Mountains 

 and two id California, has also Eastern Asian species. 



OJSSALPmEJS.— Excluding the Texano-Arizoniau forms, the only 

 Pacific representative is a single ( ; the central region has none, 



except, perhaps, a Hoffmameggia or two ; while the Atlantic has a ( 

 of its own. rising to the *i/.< k of a foresl tree, also stately trees in Qym- 

 adus and Gleditschia (two species), ami of herbs a few species oi 

 Ha. 

 MjmOseje are in oearly similar case. Not one is truly to be reckoned 

 in the Pacific flora or in the Rocky Mountain flora within our proper 

 bounds, though several representatives appear a little farther south: 

 but Schr<t))hi<(. a Mimosa, a Neptunia, and two or three species of Des- 

 WMMtkus all herbaceous) come within our limits on the ultra-Mississip- 

 pian plains and barely enter the Atlantic flora. The shrubby or 

 arboreal Mimosea [Mimosa, Prosopis in its two form-. Acacia, &c.) char- 

 acterize the Te\ano-Me\ican bordering district. 



ROSACEJE. — This important order has very characteristic North 

 American genera. Unlike the preceding order, the western genera are 

 more numerous than the eastern, and also about as numerous in species. 

 Taken under their suborders or great group — 



Chrysobalaneje. — Are represented only on the Atlantic coast, and 

 by a single Ohrysobdlanus, excluding, of coarse, the tropical one in 

 Florida. 



Amy<.i>am i;. — Occur in the Atlantic flora only under the true Vni- 



Padus, Cerasus, and Lauro-cerasus sections, except that in Texas 



torms approaching Amygdalus occur. The Pacific flora has scanty rep- 



tatives of the same types. The southern ami western borders of 



the Great Basin arc marked by two peculiar Amygdalus-like species, 



in, in which the exocarp falls from the stone in two 



es like an almond, and /'. fasciculata, on which Torrey found" 



genus, Emplectocladus. Then, the Pacific coast has the carious and 



unique genus Nuttallia,Torr. & Gray, which is regularly pluricarpellary. 



The rim- Rosacea? have Spircea hi several r eillia, Ii> 



Poti ' ". Agrimonia, Poterium, and Rosa, in common 



ever the continent, the species of Potentilla much increasing westward. 



liar to the Atlantic flora are on of Japanese affinity), 



'in. and Dalibarda : to the Pacific flora, CUamasbatia, which abounds 



;cin slope of the Sierra Nevada, and Adenostoma, which 



it of 1 1: the shrub is called 



!' the foot-hills and Peculiar to the Etc 



ntaii) flora, most! soul award exten- 



into Me ! v ery local shrub of the 



Peculiar. . to the two 



i.-.in species and tl "ten- 



