JT«. 1.] CRAY AND HOOKEB OS THE ROCKY MOUNTAIN FLORA. 49 



ri.MACi;.i:. — There arc lour line Elm trees in the Atlantic flora, and 

 one farther southwest, also the Planera : none of these in the Rockj 



Mountain or the Pacific floras; Celtis, either a form <>r the common 

 eastern of a peculiar species, extends into the Rocky Mountains and even 

 to Oregon. 



Cann \uim:.i:. — The common Hop of the Old World is indigenous in 



the Atlantic States and in the Kockv Mountains; the other species is 

 rhino Japan. 



Mukk.i:. — Morns rubra is of the Atlantic States, extending tar south- 

 ward and thence westward, perhaps passing into a small-leaved species. 



Madura aurantiaoa, the Osage Orange, belongs to the northwestern bor- 

 ders of the Atlantic district. None in the western floras. 



PLATANACE.fi. — There is one Atlantic and one ( 'alit'ornian PlatanU8] 

 but none intervening, except on the Mexican borders. 



Lei r nf.imi:.!-:. — The anomalous Leitneria,oi Florida, is of a single spe- 

 cies, of wholly obscure affinity. 



JUGLANDAOELS. — Tuglans cinerea and J. nigra or the Walnut trees 

 of the Atlantic flora, J. California of the Pacific; Carya is of seven 

 species, restricted to the Atlantic flora. 



CUPULIFERJB. — Are most fully represented in tin- Atlantic flora, are 

 prominent in the Pacific flora, but are wanting in the whole interior 

 region, excepting a Scrub Oak or two on the Rocky Mountains and their 

 accessories. There are twenty-one Oaks, two Chestnuts, and a Beech in 

 the Atlantic flora; nine Oaks and a Oastanopsis in the Pacific flora; 

 one Oak in the Rocky Mountain flora, or perhaps more than one; and 

 two or three others in the district between it and Mexico. 



Cokyi.aci:.!:. — An Ostrya and a Garpinus and two species of Gorylus 

 represent this group in the Atlantic flora. The two western floras want 

 all but one of the latter, which traverses the continent. 



BetulacEvE. — Are represented in the Atlantic flora by seven Birches 

 and three Alders. One of the smaller Birches and perhaps one of the 

 Alders, extends over to the Pacific flora, along with another Rocky 

 Mountain Birch, and two or three Alders are added. 



Mvkka< i:.i:. — The ainphigaean Myrica <i<dc is of the Atlantic flora; 

 one rery like it in the Pacific Of the Bayberry Myriea •■. there are one 

 or two on the Atlantic, and another on the Pacific coast. The C<>in/> 

 tonia is peculiar to the Atlantic flora* 



s \i.k ■im;.i.. — There are about fifteen Willows indigenous to the At 

 lantie States, nineteen in the Californian flora, very few of them iden- 

 tical : The Rocky Mountains have a few of these and <>ne or two nunc ot 



alpine type. There are su Poplars in the Atlantic States ; three or four 

 in California and Oregon; one or two in the intermediate country, be- 

 sides /'. tremuloideS) which, passing along the mountains, is common to 

 all three not 



Ti,. l tpermea maj best be exibited under the particular groups. 



Gnkta< i:.i .. — Ephedra^ the onlj extratro genus, is absent from 



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