GRAY AND HOOKEK l>» THE ROCKY M >UNTAIB PLORA. 51 



Ai:.v« ■;:.; . — Absent from tin* whole interior region; represented by 

 seven genera in the Atlantic flora, of which PeUandra and Orontium 

 are peculiar, and Si/mjilovarpus. except that it is reproduced in Japan; 

 on the Pacific coast only a relative of the latter, Ly8%chiton ) of which the 



same species occurs in Japan. 



Li.M\ \< E E, TYPHAGRJ& — Both nearly the same on the two aides of 

 the continent. 



\ a i ld \> •; . 1:.— In similar oa dpi that the Pacific coast adds 



LUaa and PhyUotpadix. 



Ai.tsMAt v.. v.. — Not dissimilar, except that the Atlantic flora has 

 era! sped gittaria and the Pacific only one. but it has the Euro- 



pean type of Itdmasonium. 



ByDROCHABEDAOEJB. — The Atlantic flora j - Linnutlium and 



VdUisneria as well as Anacharis; the Pacific, only Anacharis ; the 

 intermediate regiou none. 



BUKMANNIAGELfi. — Two Atlantic genera and species of South Amer- 

 ican affinity; none in the western floras. 



ORCHID —Are much fewer in the Pacilie flora than in the 



Atlantic, and are wanting in the intermediate region, exeept on the 

 mountains, and there in mostly amphigSMUl species. The Atlantic flora 

 has the peculiar genera Tipularia and Arethusa (but the latter is in 

 Japan), and some peculiar Habenarkc ; the Pacific pos wo Euro- 



pean genera, GepkcUatUhera and Epipaetix, but the latter La also in 

 -. and an European species of it has recently been detected iu the 

 State of New York. 



CANNACELfi. — Two genera and three species in the southern part of 

 the Atlantic flora only. 



Amakyllidace^e. — Are represented in the Atlantic flora by five 

 a. none of them peculiar, and several species. There are none in 

 the two western floras except Agave, and those of Mexican type, and 

 only along the southern border. 



ELXKODOBAGKfi. — Three genera, all strictly peculiar to the Atlantic 



■ 



BROXKLIAORfi. — Tillnndsia only along the Atlantic coast; one spe- 



DOrth to Virginia; others in Florida and it^ northern border. 

 IiMDA'K.r.. — Two peculiar genera in the Atlantic flora or its borders. 

 nid s;.si/riiirltin„i, which are more numerous in the Pacific 

 flora: the former along the mountains between. 



DIO0OOKEA4 I ;..! —A BU 0, in the Atlantic flora only. 



. — A dozen speck Uax in the Atlantic flora; 01 



them barely reaches the Rockj Mountains: a single and peculiar >p- 

 litornia. 



Boxburghiaj i:j..-- nngle species, in the Southern Atlantic 



aer in .Japan : all other relal .tie. 



L11.iv' km. — Here taken in the extended represei 



bur genera in the Atlantic!: • not wery few in the 



