20 UNITED STATES AND MEXICAN BOUNDARY. 



Hartweg,) a species which appears to have a wide geographical range. 



Mr. Hartwe 



the mountains of the Sacramento 



•we have seen others which were found by Dr. A. Eandall near the head waters of the 



Gila river. 



In the more southern portions of this district^ and growing very abundantly in the vicinity 



of the boundary line, we find the pretty Adenostoma sparsi/oUa^ (Torr. in Emory's report.) This 

 grows more plentifully among the mountains than the already mentioned ^./a5CiC2^?aifa, though 

 the two agree closely in habit and are frequently found side by side. It grows in clumps, 

 formed of numerous slender branches, and attains a height of four or eight feet. The upper 

 part of each branch divides near the summit into a fine spray, clothed with yellowish green 

 leaves, and, in the proper season, thickly set with small white flowers. The leaves and upper 

 stems are covered with a glandular varnish, which exhales a pleasant aroma resembling that 

 of Aspidium fragrans. 



Other shrubs that may be noticed as characteristic of this region are the Eriodyction Califor- 

 nicum 3,ndi Chamcehatia foUoIosa^ (Benth,;) the latter recently figured by Torrey in Plantae 



Eremontianae, in the Smithsonian Contributions. The shrubbery of this district is marked 

 by a very intricate mode of growth, especially that upon the Coast Eange of mountains. 

 Here, so densely interwoven is the close mass of stunted bushes, that it is nearly impossible to 

 force one's way either up or down the mountain sides. 



This region furnishes a large variety of herbaceous plants. The greater number of those 

 which, in the accompanying list, are referred to the '^ Mountains east of San Diego,'' have their 

 localities in this district. Among the crevices of rocks grow several species of ferns, of the 



genera Aspidium^ Gymnogrammaj Cryptogramma^ Adiantum] Woodivardia^ &c. Mosses are 



Menziesii 



(E. reti/ormisy Menzies,) and species oi Parmelia. Roccella, andEverma 



THE PROPEE MOUNTAIN REGION. 



im 



The immediate summit ridge, which is elevated to a height of from 3,000 to 5,000 feet a 

 the sea, bears a rather meagre fringe of pines and other trees of the same family. This 

 parts a peculiar feature to the landscape, and recalls to mind the snows and wintry climate of 



mis proper we find four species, some of them being dwarfed 

 representatives of those forest monarchs which are so abundant and. conspicuous further to the 



gh latitudes. Of the genus F 



north. 



In this region we encounter, though rarely, the majestic Finns Lambertianay with its enormous 

 drooping cones. P. Sdbiniana is more abundant. This species is remarkable for its singular 

 fruit, each scale of wkicli is tipped Tsith a liard curved spine. The size and shape of this fruit 

 are much like that of the pine apple. 



Another species, F. deflexa, (Torr.,) has a trunk of elesrant columnar form, and frequently 



ma 



estic proportions, even in these unfavorahle situations. The fourth species is a 



nut-pine, and is described hj Dr. Torrey in the accompanying enumeration as Finns Llaveana. 



This species is somewhat isolated in hahit, and, as far as we have ascertained, has a very 



limited range near the dividing ridge and south of the boundary line. In the character of its 



fruit and foliage this species is 



(Torr . ,) 



I 

 I 



