16 BULLETIN 1050, U. S. DEPARTMENT OF AGRICULTURE. 
^ "WHITE MAHOGANY." 
(Tabebuia donnell-smithii Rose.) 
Trumpet-Creeper oe Catalpa Family (Bignoniacele). 
other names. 
Primavera. The names "jenicero" or "genesero" have also been 
applied to this wood, but these names are also used for an entirely 
different Mexican species, namely, guanacaste (Enterolobium 
cyclocarpum). 
WHERE GROWN. 
Western coast of Mexico and southward to Guatemala. 
PHYSICAL PROPERTIES. 
The wood is moderately heavy and hard, works well, and is said 
to give little trouble by warping. It is creamy white to yellowish- 
brown in color. The grain is interlocked, and the pores are of about 
the same size as in true mahogany, so that the figure produced, espe- 
cially when finished with a mahogany stain, is similar to that of true 
mahogany. 
STRUCTURE. 
The pores are plainly visible on longitudinal surfaces as grooves, 
and can be seen on smoothly cut end surfaces as minute openings. 
They are arranged so as to form diagonal or wavy tangential rows, 
especial!} 7 in the outer portion of each growth ring as seen on the 
cross-section. (See fig. 11.) Tyloses are very common in the pores. 
Fine tangential lines, often accompanied by a darker layer of sum- 
merwood, mark the limits of the growth rings. In some pieces the 
pores are also slightly larger at the beginning of each growth ring, 
making the rings more conspicuous. 
The rays are barely visible on cross-section and inconspicuous on 
radial surfaces. On tangential faces they may or may not appear 
storied. TVlien storied they never produce conspicuous " ripple " 
marks, as in true mahogany. 
GLOSSARY. 
Density. — Amount of wood substance, equivalent to oven-dry 
weight. 
Ducts, or gum ducts. — Special ducts for storing or conveying gum. 
Found only in a few species of hardwoods ; usually smaller and less 
numerous than the pores for conducting sap. 
Family. — Botanically speaking, a group of plants having certain 
fundamental resemblances, especially in the flowers and fruit, yet 
differing more or less in this and other respects. For example, 
