Ads NATURAL HISTORY OF PLANTS. 
or cylindrical spikes. But the pod is linear, compressed, and flat- 
tened, straight or slightly curved, with a thin submembranous pericarp, 
whose two valves, continuous or dividing off into transverse joints, 
separate at maturity from the entire persistent border of the fruit. 
Acacia heterophylla. 
NIQY 
NZ 
S 
LEE 
Fria. 33, 
Leaf-bearing branch. 
Some half score species of this genus are known,’ unarmed shrubs 
from equinoctial America and the Antilles.’ 
Pithecolobium® too has hermaphrodite or polygamous flowers‘ in 
spikes or capitula, and bipinnate leaves, as in Lysiloma and Calli- 
andra. But the fruit is flat or compressed, falciform circinate or more 
or less distorted, rarely almost straight, coriaceous or nearly fleshy, 
indehiscent or more frequently two-valved, or dehiscing along the 
1K, Mimos., t. 24.—Bentu., Sulph., v. t. Monac., 188.—Envt., Gen., n. 6837 c.—B. H., 
31.—Gnists., Fl. Brit. W. Ind., 223.—Watr., Gen., 597, n. 395.— Cathormion Hassx., Retzia, 
Rep., v. 594; Ann.. iv. 635. i, 231. 
2 Tn its flowers this genus does not differ from 4 The stamens united with the corolla below 
the monadelphous Acacias ; butthe structure and contain in their anthers a pollen, in masses 
dehiscence of its fruit suffice to distinguish it analogous to that of Inga (see above, p. 42, 
from them. note 11). 
3 Mart., Herb, Flor. Bras.,114; Cat, Hort. 
