576 MIMOSACEAE 
1. Pithecolobium Guadalupéase ( Desv.) Chapm. An unarmed shrub 1-2 m. tall. 
Leatlets 4, the blades obliquely obovate or oblong-obovate, 2-4 cm. long, leathery, mucro- 
nate, undulate, delicately nerved, lustrous above ; petioles shorter than the petiolules : 
heads yellow: peduncles solitary on the axils, 4-8 cm. long, surpassing the subtending 
bracts : calyx campanulate, pubescent, the triangular lobes shorter than the tube: corolla 
pubescent : stamens 3-4 times longer than the corolla, crisped: ovary pubescent: pods 
5-10 cm. long, contorted. 
In sand, Florida keys. Also in the West Indies. 
2. Pithecolobium Unguis-Cati (L.) Benth. An armed or unarmed straggling shrub 
or small tree, sometimes 8 m. tall. Leaflets 4, the blades thinnish, obliquely obovate or 
oval, rounded or mucronate at the apex, delicately reticulated; petioles slender, mostly 
much longer than the petiolules: heads in terminal axillary panicles: calyx turbinate- 
campanulate, glabrous, the triangular lobes much shorter than the tube: corolla glabrous 
or nearly so: stamens about twice as long as the corolla : pods 8-12 em. long, contorted. 
In sand, southern peninsular Florida and the Keys, also in the West Indies and tropical America. 
2. SIDEROCARPOS Small. 
Trees, with spreading branches and zigzag twigs. Leaves alternate, but often clustered : 
blades 2-pinnate, with 4-6 pinnae: leaflets relatively few. Flowers mostly perfect, in 
cylindric spikes. Calyx campanulate, 5-lobed, very different from the corolla. Corolla 
5-lobed, the lobes longer than the tube. Stamens numerous: filaments united below. 
Ovary sessile: style filiform. Ovules numerous. Pods stout and turgid, very tardily de- 
hiscent, the valves woody, enclosing a soft tissue which separates the seeds from each other. 
Seeds transverse, on straight funicles. TEXAN EBONY. 
1. Siderocarpos flexicaülis ( Benth.) Small. An evergreen shrub or tree, reaching 
a height of 10 m., armed with short spines. Leaves with 4-6 pinnae; leaflets 6-8, the 
blades oblong, oval or obovate, 5-10 mm: long, usually obtuse, delicately reticulated 
beneath : peduncles 1-1.5 cm. long: spikes cylindric, 2-4 cm. long, often clustered in the 
axils: calyx campanulate, about 0.5 mm. high: corolla 4-5 times longer than the calyx, 
the lobes longer than the tube : pods narrowly oblong, 1-1.5 dm. long, thick and turgid, 
slightly curved, sessile. [ Pithecolobium flexicaule ( Benth.) Coulter. ] 
. On bluffs, Texas and Mexico. Summer. 
3. HAVARDIA &mall. 
Small evergreen trees, sometimes shrubby, armed with stipular spines. Leaves alter- 
nate : blades 2-pinnate, with 6-10 pinnae: leaflets numerous (20-40 in each pinna), rela- 
tively small. Flowers perfect, in head-like spikes. Calyx quite short, 5-lobed, very dif- 
ferent from the corolla in shape and texture. Corolla 5-lobed, the lobes shorter than the 
tube. Stamens numerous: filaments united below. Ovary stipitate: style filiform. 
Ovules several. Pods flat, readily dehiscent, with membranous or thin-leathery valves. 
Seeds few.  HvAJILLO. 
1. Havardia brevifdlia (Benth.) Small. An evergreen shrub or small tree, some 
times 10 m. tall, armed with short spines. Leaves with 6-10 pinnae; leaflets 20-40, the 
blades oblong or narrowly oblong, 3-7 mm. long, obtuse or acutish, reticulated beneath : 
panicles 5-10 cm. long : peduncles 1-1.5 em. long : heads subglobose, about 2 cm. 1n diam- 
eter: corolla 6-8 times longer than the calyx, the ovate lobes shorter than the tube: xr 
mens between twice and thrice longer than the corolla: pods linear-oblong, flat, 7- 
em. long, acuminate at the apex, stipitate. —[ Pithecolobium brevifolium Benth. ] 
In valleys, southern Texas and northern Mexico. 
4. ALBÍZZIA Durazz. 
Unarmed shrubs or trees, with wide spreading branches. Leaves alternate, blades 2- 
pinnate : leaflets small, numerous, their glands, as well as the petiolar glands, more OF ~ 
conspicuous. Flowers perfect, or polygamous, in peduncled, sometimes panicled, capitate 
spikes. Calyx tubular to campanulate, 5-lobed. Corolla funnelform, the lobes often 
shorter than the tube. Stamens numerous, exserted : filaments united at the base of br 
corolla-tube and sometimes adnate to it. Ovary often short-stalked. Pods linear, flattish, 
2-valved, the valves not separating from the margins, or indehiscent 
