MIMOSACEAE 577 
1. Albizzia Julibríssin Durazz. An unarmed shrub or tree, reaching a height of 
10m. Bark scaly: leaves 2-4 dm. long, with 16-24 pinnae; leaflets 50-70, the blades 
oblong, inequilateral, acute: heads showy, pink, 4-6 cm. in diameter: corolla pink, 3-4 
times longer than the calyx; lobes ovate: stamens 3 3.5 cm. long: pod broadly linear, 
10-15 cm. long, acuminate at both ends, sometimes slightly constricted between the seeds. 
In sandy soil and woods, Virginia to Florida and Louisiana. Naturalized from Asia. Spring and 
summer. 
5. LYSILOMA Benth. 
Unarmed shrubs or trees, with slender branches. Leaves alternate: blades pinnate : 
each petiole often bearing a large gland : leaflets small and in many pairs, or large and in 
few pairs. Flowers often polygamous, subtended by 3-lobed bractlets, in globose or cylin- 
dric long-peduncled heads. Calyx campanulate, 5-lobed. Petals united into a 5-lobed 
corolla. Stamens numerous: filaments united at the base. Ovary sessile or short-stalked : 
style filiform. Ovules several, anatropous. Pods flat, linear or oblong, straight or falcate, 
somewhat membranous. Seeds flattened, transverse. WILD TAMARIND. 
1. Lysiloma latisiliqua (L.) Benth. An unarmed tree 5-16 m. tall, with wide- 
poe branches. Leaves 8-14 em. long, with 4-8 pinnae; leaflets 20-40, the blades 
oblong or oblong-lanceolate, 8-11 mm. long, acute : beads about 1 cm. in diameter, white : 
pods oblong, 8-15 cm. long, flat, undulate, each with a stipe 2-4 cm. long. 
In sandy soil, Florida Keys and the West Indies. Spring. 
6. ACACIA Adans. 
Shrubs or trees, or rarely herbs, usually armed. Leaves normal or sometimes reduced 
to phyllodes: blades usually 2-pinnate, the pinnae numerous: leaflets often very numerous. 
Flowers perfect or polygamous, in globose or cylindric spikes on axillary peduncles. Calyx 
mostly campanulate, 4—5-lobed, or wanting. Petals 4—5, distinct or somewhat united. 
Stamens numerous: filaments distinct, or the inner somewhat united at the base. Ovary 
often stalked. Ovules 2-many. Pod flat, straight or curved, 2-valved or indehiscent. 
Leaflets of each pinna mostly more than 20. 
Pods over 15 mm. broad : the ultimate divisions of the leaf-rachis puberulent. 1. A. Berlandieri. 
Pods less than 10 mm. broad: the ultimate divisions of the leaf-rachis glabrous 
or with few long hairs. 
Leaflets of each pinna 40-100, acute. 2. A. filicioides. 
Leaflets of each pinna 20-34, blunt. 3. A. cuspidata. 
Leaflets of each pinna mostly less than 20. 
Flowers in head-like spikes. 
Pods less than 8 mm. broad, constricted between the seeds: leaflets less than 
1mm. broad. 4. A. constricta. 
Pods over 15 mm. broad, not constricted between the seeds: leaflets over 2 
mm. broad. 5. A. Roemeriana. 
Flowers in elongated spikes or racemes. 
Pods over 10 mm. broad. 
Flowers slender-pedicelled. 6. A. Wrightit. 
Flowers sessile or nearly so. 7. A. Greggit. 
Pods less than 10 mm. broad. 8. A. amentacea. 
,,l, Acacia Berlandiéri Benth. A shrub, clothed with ashy pubescence, unarmed or 
ep few spines. Leaves 10-15 cm. long, with 10-18 pinnae ; leaflets 50-90, the blades 
ee onioni 4-6 mm. long, oblique, prominently nerved, acute or acutish: spikes glo- 
e, slightly over 1 em. thick : pods flat, linear, 10-15 em. long, 18-20 mm. broad, usually 
straight, obtuse or apiculate at he apex, each narrowed into a stipe at the base, the valves 
velvety-tomentose, fen: 
On dry bluffs, southern Texas and Mexico. Spring. 
2. Acacia filicioides (Cav. ) Trelease. An unarmed shrub, with more or less densely 
ute foliage, stems angled. Leaves 5-15 cm. long, with 8-30 pinnae or sometimes 
i hail leaflets very numerous, the blades oblong or narrowly oblong, 4-5 mm. long : spikes 
Í obose, about 1 em. thick, on hirsute peduncles 1-2 em. long : pods linear-oblong, 3-4 cm. 
ong, 6-9 mm. wide. [A. filicina Willd. ] 
s IM and in sandy soil, Missouri and Kansas to Texas, Arizona and Mexico, also in Florida, 
ori a is 4 ri ^ Yee ee wholly or partially glabrous form, sometimes occurring in Texas and 
" . exénsis (T. & G.) Small. 
Pius Acacia cuspidata Schlecht. A low shrub, with sparingly pubescent foliage. 
hai es 5.97 cm. long, with 4-10 pinnae, the rachis and its divisions with few scattered 
airs; leaflets 20-34, or rarely some of the pinnae with fewer, the blades thick, linear- 
37 
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few 
