MIMOSACEAE 581 
apiculate or slightly acuminate, strongly nerved beneath: peduncles armed with slender 
prickles : pods 3-15 cm. long, beaked, densely prickly or sometimes sparingly so. : 
In dry soil, Virginia to Florida and South Dakota to Arkansas, Texas and the Gulf of Mexico. 
Spring and summer. 
2. Morongia angustàta (T. & G.) Britton. Stems sparingly armed with recurved 
prickles, the angles not conspicuously paler than the rest of the stem, 3-15 dm. long, 
simple or sparingly branched: leaves with 6-16 pinnae; leaflets many, the blades 
narrowly oblong, 1.5-7 mm. long, scarcely or not at all nerved ; peduncles armed like the 
stem : pods 5-15 em. long, beaked, densely or sparingly prickly. 
In dry soil, Virginia to Tennessee, Texas and Florida. Spring and summer. 
3. Morongia làtidens Small. Stems usually bright green, 3-10 dm. long, with 
conspicuously pale and sharp angles and still paler prickles: leaves with 4 pinnae or rarely 
some of them with only 2 pinnae; leaflets many, the blades thick, oblong, 3-8 mm. long, 
apiculate, not nerved : peduncles much stouter than the petioles, with few pale prickles : 
pods stout, 3-7 cm. long, the sides with broad prickles, the broad margins scarcely or only 
slightly armed ; beak 1-1.5 cm. long. 
In dry soil, Kenedy, Carnes County, Texas. Spring and summer. 
4. Morongia Roemeriàna (Scheele) Heller. Stemsarmed with very small prickles, 
3-12 dm. long, prominently but not conspicuously angled: leaves with 4-8 pinnae; 
leaflets many, the blades oblong, 4-5.5 mm. long, apiculate, not nerved, more or less 
ciliate: peduncles much stouter than the petioles, and armed like them, and with numer- 
ous smaller bristles crowded near the apex: pods flattened, 3.5-4.5 cm. long, the sides 
with very fine prickles, the margins with stouter prickles; beak 4-5 mm. long. 
Instony soil,southern Texas. Spring. 
11. MIMÓSA L. 
Shrubby plants or trees, or rarely herbs, usually thorny or prickly. Leaves often 
sensitive, with 2-pinnate blades : leaflets four or numerous. Flowers perfect or polygamous, 
in axillary, white or colored head-like or cylindric spikes. Calyx mostly 4—5-lobed, some- 
times obsolete. Corolla of usually 4-5 well united petals. Stamens 4-10, exserted : fila- 
ments distinct. Ovary sessile or nearly so. Ovules 2-several. Pods flat, sometimes 
conspicuously jointed, often prickle-armed, the valves separating from the persistent 
margins. 
Stamens as many as the corolla-lobes LH puc 
Stamens twice as many as the corolla-lobes. ar 
Shrubs or trees with hard wood. 
Branchlets and piiois or their divisions glabrous. 
Leaves usually with 2 pinnae); leaflets 6-10, the blades oval or orbicular- 
oval, 2-4 mm. long: pods armed. 2. M. borealis. 
Leaves usually with 4-6 pinnae; leaflets usually 12, the blades oblong or 
B oblong-obovate, 4-6 mm. long: pods unarmed or nearly so. 3. M. fragrans. 
es and petioles or their divisions puberulent or pubescent. 
I with 2-4 or rarely 6 pinnae; leaflets 4-12. 4. M. Texana. | 
Herbs i phn with 6-many pinnae ; leaflets numerous. 5. M. Lindheimeri. 
Chi > undershrubs or soft-woody climbing shrubs. 
er ing : foliage tomentose or puberulent: leaflets with blades less than 
m wice as long as broad. 6. M. malacophylla. 
ostrate and creeping or erect: foliage strigose or strigillose: leaflets with 
blades over twice as long as broad. ; 
LIÉ or ascending: peduncles becoming 1-2 em. long: pods 8-15-seeded. 7. M. Berlandiert. 
rostrate : peduncles becoming 5-20 cm. long: pods 2-4-seeded. 8. M. strigillosa. 
ES Pee püdica L. Herbaceous or somewhat shrubby, several dm. tall, the stems 
pairs se ranched, more or less hirsute with downy hairs. Leaves with 1 or 2 approximate 
valves Spire : peduncles 1-4 cm. long: pods often densely clustered, 1-2 cm. long, the 
glabrous, the margins armed with spreading bristles. 
In waste places, about the cities of the Gulf States. Naturalized from tropical America. 
th 2. Mimosa boreàlis A. Gray. A glabrous armed shrub usually over 1 m. tall, with 
a | OT beside the axils. Leaves inconspicuous, usually with 2 pinnae; leaflets 6-10, 
e blades oval, or orbicular-oval, 2-4 mm. long, thick, glaucescent: peduncles slender, 
elie mm. long: pods 2.5-5 em. long, usually armed on one or both margins, deeply con- 
ricted, the segments often 4. 
In dry soil, the Indian Territory and Texas. 
cae Mimosa fragrans A. Gray. A glabrous armed shrub, usually less than 1 m. tall, 
lead h € spines beside the axils. Stems much branched : leaves mostly with 2-6 pinnae ; 
ets 10-16, the blades oblong to oblong-obovate, 4-6 mm. long, usually obtuse, promi- 
