Plante Lindheimeriane. 939 
considerable resemblance to that of the southern United 
States. But south of the Brazos, and still more south of the 
Colorado, the character of the vegetation changes; it assumes 
the peculiarity of the flora of the Rio Grande valley, which I 
have tried to characterize in Wislizenus's Report. "The flora 
of the Rio Grande connects the North American with the 
Mexican { ora, and has also many peculiar plants of its own, 
some of which have for the first time been distributed in Lind- 
heimer's collections: such are the interesting Rutosma, the 
only American Rutacea known ; Galphimia linifolia, the most 
northern Malpighiacea; several shrubby Mimosez ; an ever- 
green Rhus; Sophora speciosa ; the Eysenhardtia ; a number 
of Nyctaginaces ; the Dasylirion, and many others enume- 
rated in this catalogue. "The ligneous plants become shrubby 
and often thorny, and here the chaparals, so famous in north- 
ern Mexico, make their first appearance. 
“ Towards the northwest the granitic soil produces a num- 
ber of plants, which indicate a connection with the flora of 
New Mexico, and again with that of our western plains. 
“In the neighborhood of New Braunfels the effects of 
cultivation on the distribution of plants are already apparent. 
Helianthus lenticularis, Verbesina Virginica, Croton ellipti- 
cum, Nycterium lobatum, different Cenopodiaceze and Ama- 
ranthaceæ are becoming very common in cultivated places; 
but others, Digitaria sanguinalis, for example, so common in 
eastern "Texas, have not yet made their appearance. In 
Cedar woods Leria nutans, in damp bottom woods Dicliptera 
brachiata, on dry prairies the small blue Evolvulus, are getting 
much more abundant; while Pinaropappus roseus, Fedia 
stenocarpa and others are much rarer than they used to be in 
the first years of the settlement of the country. 
*In'the catalogue of the collections of 1843 and 1844, 
