62 NATURAL HISTORY OF PLANTS. 
thick (Anonychium), sometimes elongated plano-convex or moniliform 
(Algarobia), more rarely irregularly thickened, corrugated twisted’ 
(Adenopis); indehiscent; endocarp cartilaginous or papyraceous, 
usually produced into septa between separate seeds, more rarely con- 
tinuous by disappearance of septa; mesocarp thin or more usually 
thick, spongy. Seeds ovate or oblong, compressed.—Trees or shrubs, 
prickly, usually armed with axillary spines ; leaves 2-pinnate; pinnze 
1-, 2-, or rarely «-jugate; leaflets often somewhat rigid, pauci- or’ 
multi-jugate; stipules small or 0; flowers in solitary or fascicled 
axillary racemes spikes or globose heads (A// tropical and subtropical 
regions).—See p. 28. 
11. ? Xerocladia Harv.—Flowers 5-merous (of Prosopis); calyx 
deeply cleft; petals cohering below the middle. Stamens shortly 
exserted. Ovary 1- or pauciovulate. Legume sessile plano-com- 
pressed indehiscent, 1—2-seeded, “ broadly falciform-ovate or semi- 
orbicular, bowed tapering winged at inferior suture.” A small shrub, 
rigid much-branched; leaves few 2-pinnate; pinne 1-2-jugate ; 
leaflets small pauci-jugate; stipules spinescent curved; flowers in 
short subcapitate axillary spikes; peduncle short (Southern Africa).— 
See p. 29. 
12. Dichrostachys DC.—Flowers 5-merous differing in colour, 
hermaphrodite or polygamous, inferior neuter. Calyx toothed. 
Petals cohering below the middle, valvate. Stamens 10; filaments 
in hermaphrodite flower free slender ; in neutral and female petaloid 
or filiform, elongated coloured ; anthers introrse, crowned by a stipi- 
tate gland, in neutral and female flowers small or sterile or usually 0. 
Gyneceum of Prosopis. Legume linear compressed twisted coriaceous 
indehiscent, continuous within ; valves rarely separating irregularly 
from sutures. Seeds obovate compressed.—Shrubs; twigs often 
short, sometimes spinescent leafless ; leaves 2-pinnate, often fascicled 
on floriferous branches; leaflets small o-jugate; stipules small or 
deciduous, or on floriferous twigs, broader imbricated; flowers in 
spikes; spikes cylindrical pedunculate, solitary or geminate, often 
nutant, either axillary or terminal on very short fascicled-leaved 
twigs; upper flowers hermaphrodite, lower neuter, middle often 
unisexual (Zropical Asia, Africa, and Australia).—See p. 29. 
