172 SILVA OF NORTH AMERICA. SAPOTACE. 
The wood of Bumelia lanuginosa is heavy, rather soft, not strong, close-grained, with many thin 
medullary rays, and is light brown or yellow, with thick lighter colored sapwood. The specific gravity 
of the absolutely dry wood is 0.6544, a cubic foot weighing 40.78 pounds. In Texas it is sometimes 
used in cabinet-making. The clear viscid gum which exudes in considerable quantities from the freshly 
cut wood is used domestically. 
Bumelia lanuginosa was first distinguished by the French botanist Michaux, who found it in 
Georgia ; it was introduced into cultivation early in the present century and is still occasionally found 
in European gardens. 
In the region adjacent to the southern boundary of the United States, from western Texas and 
Nuevo Leon to Arizona, a form’ occurs with more rigid spinescent branches and with thick coriaceous 
leaves which vary from obovate to cuneate-oblanceolate, and are rather more than an inch in length and 
a quarter of an inch in width; at maturity they are covered on the lower surface with sparse pale 
tomentum or are nearly glabrous. It is a small tree eighteen to twenty-five feet in height, with a short 
trunk covered with red-brown bark divided into long appressed ridge-like scales broken into minute 
flakes, and inhabits dry gravelly mountain slopes in the neighborhood of streams. 
The wood of Bumelia lanuginosa, var. rigida, is heavy, hard, and very close-grained, with thin 
obscure medullary rays, and is a light rich brown or yellow, with thick lighter colored sapwood. The 
specific gravity of the absolutely dry wood is 0.6603, a cubic foot weighing 41.15 pounds. 
1 Bumelia lanuginosa, var. rigida, Gray, Syn. Fl. N. Am. ed. 2, Candolle) (1883).— Sargent, Forest Trees N. Am. 10th Census 
ii. 68 (1886). U. S. ix. 102. 
Bumelia spinosa, Watson, Proc. Am. Acad. xviii. 112 (not De 
EXPLANATION OF THE PLATE. 
Prate CCXLVII. Bumexia LANuGINosSA. 
- Flowering branches of the typical and of the spinescent forms, natural size. 
A flower, enlarged. 
A flower, with the corolla displayed, enlarged. 
Front and rear views of a stamen, enlarged. 
. A fruiting branch, natural size. 
. Vertical section of a fruit, natural size. 
. A seed, natural size. 
. An embryo, natural size. 
OMONA MNP Wt Ee 
. A winter branchlet, natural size. 
