iVo. 1.1 GRAY AND HOOKER ON THE ROCKY MOUNTAIN FLORA 19 



somewhat continuous across the continent, although extending well 

 southward along the mountains. 



A full analysis of the herbaceous vegetation would run too far into 

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

 which are characteristically prominent. 



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

 to the Eocky Mountains are Ghionophila^ which is strictly alpine, and 

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

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

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

 speak of. 



Synthyris, a Scrophulariaceous 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. 



HesperocMron of S. Watson is a peculiar HydrophyUaceous type, but 

 both species occur also in the Sierra IsTevada. 



Lewisia is a most characteristic and almost peculiar genus j 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 

 region, and a few have a more western range. 



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

 a more western region. 



Glycosfna, Cynapium of IS'uttall (now in Ligusticum), Gamassia^ Gory- 

 dalis Gasmna, Parnassia fimbriata, GauUheria Myrsinites, and the con- 

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



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

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



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

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

 the Eocky 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 Eocky Mountain herbaceous 

 vegetation in the region specified, taken as a whole aud in reference to 

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

 ing genera, which have assumed their maximum development in and 

 "west of these mountains, and are mainly if not quite peculiar to Il^orth 

 America. 



Gilia, Gollomia, Phlox, and Polemonium, of the order Polemoniacece. 



Pentsfemon, Gastilleia, and Miimilus, of the order Scrophulariaceoi ; and 

 Pedicularis here takes its principal American development in the higher 

 regions. 



