254 DRUPACEAE. (Vou. II. 
1. Amygdalus Peérsica I, Peach. 
(Fig. 2027.) 
Amygdalus Persica I,. Sp. Pl. 472. 1753- 
A small tree, the purplish-brown twigs gla- 
brous. Leaves mostly lanceolate or oblong-lan- 
ceolate, 3/—5’ long, 8’’-18’’ wide, glabrous on 
both sides, long-acuminate at the apex, usually 
narrowed at the base, finely serrulate nearly all 
around, thickish; petioles 1//-3’’ long; flowers 
pink, %4/-2/ broad, scaly-bracted; drupe subglo- 
bose, grooved, softly velvety, 1}4’—3’ in diameter. 
Escaped from cultivation, southern New York to 
North Carolina. April-May. 
Family 46. MIMOSACEAE Reichenb. Fl. Exc. 437. 1832. 
Mimosa FAMILY. 
Herbs, shrubs or trees, with alternate mostly compound, commonly 2—3-pin- 
nate leaves, the stipules various, and small regular perfect flowers in heads, 
spikes or racemes. Calyx 3-6-toothed, or 3-6-lobed, the teeth or lobes mostly 
valvate in the bud. Corolla of as many distinct or more or less united petals, 
also valvate. Stamens as many as the petals, or twice as many, or ©, distinct, 
or monadelphous. Ovary 1-celled; ovules several or numerous; style simple. 
Fruit a legume. Seeds without endosperm; cotyledons fleshy. 
About 30 genera and 1350 species, mostly of tropical distribution, a few in the temperate zones. 
This, and the three following families, are often united under the name LEGUMINOSAE. 
Stamens numerous, at least more than Io. I. Acacia. 
Stamens only as many as the petals, or twice as many. 
Petals separate; pod smooth. 2. Acuan. 
Petals united to about the middle; pod spiny. 3. Morongia. 
1. ACACIA Adans. Fam. Pl. 2: B19) L703. 
Shrubs or trees, some species nearly herbaceous, with bipinnate leaves, the ultimate leaf- 
lets usually small and numerous, or the leaves in many exotic species modified into flat 
simple phyllodes. Flowers small, in heads or spikes. Calyx campanulate, usually 4-5 
toothed, or of 4 or 5 distinct sepals. Petals mostly 4 or 5, separate, united, or wanting. 
Stamens , exserted; filaments filiform; pollen-grains cohering in 2’s-6’s. Ovary sessile 
or stipitate. Pod linear, oblong or oval, flat or swollen, often constricted between the seeds. 
[Greek, point, or thorn, many species being thorny. ] 
_ About 450 species, chiefly in subtropical regions, most abundant in Africa and Australia, a few 
in the temperate zones. Besides the following, some 15 others occur in the southern United States, 
1. Acacia filiculoides (Cav.) Trelease. Prairie Acacia. (Fig. 2028.) 
Mimosa filiculoides Cav. Ic. 1:55. pl. 78. 1791. 
Acacia filicina Willd. Sp. Pl. 4: 1072. _1806. 
Acacia filiculoides Trelease; Branner & Coville, Rep. 
Geol. Surv. Ark. 1888: Part 4,178. 1891. 
A thornless shrub, varying from glabrous to hir- 
sute-pubescent, sometimes herbaceous. Pinnae of 
the leaves 2-15 pairs, oblong in outline, 1/-2’ long; 
leaflets 10-50 pairs, oblong or linear-oblong, about 
2// long, less than 1// wide, obtuse or acute, slightly 
inequilateral, 1-veined; heads globose, many-flow- 
ered, axillary, slender-peduncled, 6’’-10’’ in dia- 
3 YA . “A meter; sepals distinct or nearly so; filaments yel- 
Thies \ Wee = 7s) low, 3-4 times as long as the sepals; pod linear, 
ant ns, ZG QM IZ WSS *\__ acute, often narrowed at the base, stipitate, mostly 
\ iy NZ straight, 1/-2’ long, about 3/’ wide, flat, its valves 
( SRY. 
| 
" thin, reticulated, glabrous or pubescent, impressed 
\ ii 
between the seeds. 
Prairies, Missouri and Kansas to Texas, Arizona and 
Mexico, May-July. 
Vg 
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