ZYGOPHYLLACEAE. 159 
Guaracum. Lignum Vitae. 
(Family Zygophyllaceae). 
Trees with very hard yellow 
wood and resinous bark: ever- 
green. Twigs rather _ slender, 
forking at short intervals, green, 
subterete: pith small, round, con- 
tinuous, white. Buds scarcely dis- 
cernible, not evidently scaly ex- 
cept as the abortive end-bud may 
show several stipules. lLeaf-scars 
opposite but the pairs not decus- 
sating, broadly crescent-shaped, 
somewhat elevated by the swollen 
nodes: bundle-trace 1, indistinct: 
‘stipules rather persistent, one of 
each pair overlapping the other. 
Leaves abruptly pinnate, with sev- 
eral pairs of rather large entire 
leaflets. 
In his collected essays On Buds 
and Stipules Sir John Lubbock— 
who subsequently became Lord 
Avebury—pictures twigs of Guaiacum which have the leaf- 
pairs decussating in the normal manner. 
Stipules blunt: leaflets prominently veiny. (1). G. officinale. 
Stipules pointed: leaflets obscurely veiny. (2). G. sanctum. 
