| 
1901] VEGETATION OF WESTERN TEXAS 273 
“black chaparral,” whose foliage and beans yield tons of forage. 
It constitutes 60 to 75 per cent. of the shrubby vegetation on 
many thousands of acres in Maverick, Dimmitt, and Webb coun- 
ties (fig. 9.) 
Acacia Wrightit formation.—This is known as ‘bee blossom,” 
Fic. 19. Pure formation of Lupinus subcarnosus at Austin; a type of prairie 
annual. 
and ‘cats claw,” and is especially prevalent in the northern 
part of the province between the Nuéces and Medina rivers. 
Generally it is an open formation on grass plains, and is fre- 
quently of low arborescent dimensions. 
Acacia Berlandieri or huajillo formation.—This is a very striking 
vegetation occupying the basalt ridges and cones extending east 
and west along the northern border of the province. Farther 
southeast the formation has been noted on coarse gravelly ridges 
denuded of finer sediment. Everywhere its height scarcely 
exceeds three or four feet. 
