97 

 Tilia pubescens leptophylla Vent. Thinleaf Downy Basswood. 



RANGE. — Louisiana; local. 



Tilia heterophylla Vent. White Basswood. 



RANGE. — From Pennsylvania (through the Allegheny Mountains) to western and 

 central Florida (Lake Charm in Orange County) and Alabama (Tennessee River 

 valley to central prairie region); west to southern Indiana and Illinois, Kentucky 

 and Tennessee (to Nashville). 



Names in use. — White Basswood (Ind., Ala.); Waboo (Ga., Fla.); 

 Wild Linden; Smooth-fruited, White-leaved Limetree (Term.); Large- 

 leaved Limetree (Term.); Silver-leaf Poplar (Ky.); Cottonwood (Ky.); 

 Lin (Ind., Term.). 



Family CACTACEiE. 



CEREUS Mill. 

 Cereus giganteus Engelm. Griant Cactus. 



Range. — Central and southern Arizona (from Bill Williams River to the San 

 Pedro River) and southward into Mexico (Sonora). 



Names in use. — Giant Cactus (N. Mex., Ariz.); Sahuara (Ariz.); 

 Saguaro (Ariz.). 

 Cereus thurberi Engelm. Thurber Cactus. 



Range. — Southwestern Arizona; Mexico (Sonora); Lower California. 



Names in use. — Pitahaya (Mex.); Pitahaya dulce (Mex.). 

 Cereus schottii Engelm. Schott Cactus. 



Range. — Southern Arizona; Mexico (Sonora) ; Lower California. 



Names in use. — Zina, Sina, Sinita, Hombre viejo, and Cabeza 

 viejo (Ariz., Mex.). 



OFUNTIA 1 Mill. 

 Opuntia fulgida Engelm. Cholla. 



RANGE. — From southern Nevada (Cottonwood Springs) through Arizona (south 

 of Colorado plateau in Pima, Maricopa, Pinal, and Cochise counties) into Mexico 

 (Sonora), and Lower California. 



Opuntia fulgida mammillata (Scott) Coult. 



Range. — Through southern Arizona (southern foothills of Santa Catalina Moun- 

 tains, etc.) into Mexico (Sonora). 



; Although several species of Opuntias have long heen known to he of tree-like 

 form and dimensions, these arhorescent species have usually not heen considered 

 strictly trees. It is evident, however, that they should he regarded as true trees, 

 hoth from their tree-like form, and also from their truly woody internal structure. 

 Prof. J. W. Tourney, of the University of Arizona, who has conducted many critical 

 studies on southwestern Cactaceai, writes the following concerning one of the tree 

 Opuntias: 



" The reticulated wood is used to some extent in the manufacture of light furni- 

 ture,, fancy articles, canes, picture frames, etc. A factory was established in Salt 

 River Valley (Arizona) some three years ago for the purpose of manufacturing 

 articles ironi this wood." 



For excellent illustrations of the general appearance of these trees, the reader is 

 referred to following articles by Professor Tourney: Opuntia fulgida, Garden and 

 Forest, VIII, 324, f. 45, 1895; Opuntia arborescens, Garden and Forest, IX, 2, f. 1, 1896. 

 19193— No. 17 7 



