46 
NATURAL HISTORY OF PLANTS. 
Enterolobium has all the characters of Pithecolobium in inflorescence 
and vegetative organs. 
Calliandra brevipes. 
But its pod is broadly circinate or incurved- 
reniform, thick compressed hard and in- 
dehiscent, with a spongy mesocarp finally in- 
durated, and an endocarp prolonged inwards 
to form strong septa, separating the com- 
pressed transverse seeds. The three or four 
known species of this genus’ are unarmed 
trees from tropical America, with the flowers 
in globular capitula, collected into spikes or 
racemes. 
Fia. 36. 
Inflorescence. 
All these genera, so difficult to separate 
at all clearly, have small flowers, with the 
exception of certain of the species of Inga. 
The flowers become relatively voluminous in the three remaining 
genera of this group—Serianthes, Affonsea, and Archidendron. The first 
consists of unarmed trees, with large bipinnate leaves.’ The flowers, 
forming short corymbose racemes, have a thick coriaceous gamose- 
palous calyx, with five valvate teeth, a gamopetalous corolla, also 
valvate and five-lobed, and an androceum consisting of a very large 
number of stamens, whose filaments cohere into a tube, adherent for 
membranous, caducous, or absent. Peduncles 
axillary, solitary or geminate. Pod thick (inde- 
hiscent ?) straight or bowed. Seeds exarillate. 
Species five, American. GRisEBACH refers this 
species also to Acacia. 
III. Caulanthon.—Unarmed trees with cadu- 
cous or persistent stipules and paucifoliate leaves. 
Inflorescences peduncul.te, fascicled on the trunk 
or branches. Pod usually two-valved, straight 
or bowed. Seeds exarillate. Species fifteen, 
American. (VauL., Eelog,, iii. t. 27.—VELLOz., 
op, cit., xi. t, 48.—MiQ., Stirp. Surin, t. 1). 
To this section belongs Zygia P. Br. (Jam., 
279, t. 22, fig. 3, nec Auctt.). GRISEBACH (op. 
cit., 225) refers it to the genus Calliandra. 
IV. Cathormion.—Unarmed trees; inflores- 
cence solitary or subfasciculate in axils of leaves. 
Flowers often pedicellate, Pod nearly straight, 
bowed, or circinate, two-valved or indehiscent, 
with false septa between the seeds, and some- 
times parting into one-seeded joints at maturity. 
Species ten, all natives of the Old World, mostly 
Asiatic (including Concordia Bunrx., part.), 
two Australian (BENTH., in Hook. Journ., iii. 
211; Fl. Austral., ii, 423), and one from tropical 
Africa (P. altissimum, BENTH., op. cit. 197.— 
Outv., Fl. Trop. Afr. ti. 364.—Albizzia altis- 
sima Hook. F., Niger, 332). 
V. Abaremotemon.—Unarmed trees; stipules 
absent or ill developed. Leaflets usually nu- 
merous. Peduncles axillary, solitary or rarely 
fascicled. Pod broad, distorted, cochlear. 
Species about fifteen, American (VAHL., op. cit., 
iii, t. 28.—VEuLoz., op. cit. xi. t. 18, 14.— 
Ki, ap. Hayn., Arzneig., xiv. 18). 
VI. Unguis-cati.—Trees ; leaves with wholly 
or partly spinescent stipules, pinnules unijugate 
or unequally bijugate. Peduncles axillary or 
panicled, solitary or fascicled. Pod cochlear, 
valves variably twisted after dehiscence. Species 
about twenty, two Asiatic; the rest American. 
(K., Mimos., t. 15, 16, 18.—Vaut., op. cit., iii. 
t. 25, 26.—Jacq., Hort. Schenbdr., t. 392.— 
Roxs., Pl. Coromand., t. 99.—Wiaut, Icon., 
t. 198. 
VII. Clypearia.—Unarmed trees. Inflores- 
cences in numerous pedunculate panicles, whose 
ramifications are more or léss obliquely super- 
posed. Pod broad, contorted, cochlear, often woody. 
Aril present or wanting. Species ten, Asiatic. 
1 Mart., Herb, Fl. Bras., 117, 128.—Envt., 
Gen., n. 6837 d—B.H., Gen., 598, n. 396. 
2 Vettoz., Fi. Flum., xi. t. 25, 26.—GRisxs., 
Fl. Brit., W. Ind., 226.—Watp., Rep., v. 621. 
3 Bentu., in Hook. Journ,, iii. 225.—B. H., 
Gen., 599, 1004, n. 397. 
