JVo. 1.] GRAY AND HOOKEB ON THE ROCKY MOUNTAIN FLORA 19 



somewhat continuous across the coin incut, although extending well 



southward along the mountains. 



A full analysis oi' the herbaceous vegetation would run too far into 

 details. We can mention only the peculiar typo and some of the genera 

 which are characteristically prominent 



The three genera (each of a single species) which are wholly restricted 

 to the Rocky Mountains are Chionophila, which is strictly alpine, and 

 has been already mentioned as such, and Leucampyx, an Anthemideous 

 Oomposita (both of southern habitat), and Orogcnia, S. Watson, a little 

 Umbelliferous plant, with habit of Erigenia, but too little known to 

 speak of. 



8ynthyr%8) a Scropkulariaceous genus of seven species, is a character- 

 istic but not quite a peculiar type, one of the seven species being of 

 more western habitat, and one on the eastern verge of the Atlantic 

 region. 



Hesperochiron of S. Watson is a peculiar Hydrophyllaceous type, but 

 both species occur also in the Sierra Zsevada. 



/. oisia is a most characteristic and almost peculiar genus; but the 

 original species has been found even in California, and a second one oc- 

 curs on the southwestern rim of the Great Basin. 



Toumsendia is a highly characteristic genus, but some species belong 

 to the alpine regions above and some to the dry plains below the forest 

 a, and a few have a more western range. 



alcea Candida is a restricted species of a genus peculiar to our and 

 a more western region. 



Glycosma, Cynapium of Xuttall (now in Ligusticum), Camassia, Cory- 

 dalis Casmna, Parnassia Jimbriata, Gaultlwria Myrrinites, and the con- 

 siderable genera Wyethia and HeliantheUa, are in very similar case. 



Calochortus is a most characteristic type of numerous species, some of 

 the Rocky Mountains, more of them Californian, and a few Mexican. 



Adenocaulon bicolor (of a peculiar genus, which is also both Eastern 

 tic and Chilian) is rather a western coast plant, which has traversed 

 the Rocky Mountains at the north, even to Lake Superior. 



Frasera, a marked and wholly North American genus, has given one 

 species to the Atlantic forest, and shared two or three with the western 

 region. 



But the characteristic features of the Bocky Mountain herbaceous 



tation in the region specified, taken as a whole and in reference to 



abundance both of forms and of individuals, are imparted by the follow- 



j-ii'-ir;. which have assumed their maximum development in and 



monntainSj and are mainly if not quite peculiar to Xorth 



A m< . 



G -. OoUomiO) Phlox, and PolemoniwM) of the order Polemoniacece. 



Pent.stcmon, Caatilleia, and Mimulu.s, of the order Scrophulariacea ; and 

 Pedicularia here takes its principal American development in the higher 

 regions. 



