302 SAPOTACEAE. 
BuMELIA. False Buckthorn. 
(Family Sapotaceae). 
Shrubs or small _ spreading 
trees with branch-spines: mostly 
deciduous. Twigs moderate, zig- 
zag, often occurring as short leafy 
spurs: pith continuous, white or 
striped with brown. Buds small, 
hemispherical, sessile, sometimes 
branched or developing a collat- 
eral spine, with about 4 exposed 
scales. Leaf-scars alternate, tri- 
angular or crescent-shaped or 
shallowly U-shaped, somewhat 
raised: bundle-traces 3, sometimes 
subconfiuent: stipule-scars lack- 
ing. 
Winter-character reference:— 
Bumelia lanuginosa. Hitchcock 
‘GE er. ° 
One of the first novelties to 
which a visitor to Mexico is in- 
troduced is the zapote or mamey 
sapote, the fruit of Calocarpum mammosum or Lucuma mam- 
mosa; and one of the sweetest of all fruits is the sapote chico, 
chicozapote, or sapodilla, the fruit of Achras Sapota, a tree 
which furnishes the too-familiar chicle chewing gum, of which 
large quantities are brought up by every fruit ship touching 
at Belize. A very readable account of these sapotaceous 
plants is given by Pititier in volume 18 of Contributions from 
the U. S. National Herbarium. 
1. Subevergreen: leaves golden-satiny beneath. (1). B.tenax. 
Mostly deciduous: leaves not satiny if present. 2. 
2. Glabrous: twigs black-purple. (2). B. lycioides. 
Somewhat tomentose: twigs red-gray. B. lanuginosa. 
