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1. AMSONIA Walt. 
Perennial herbs, with alternate leaves, pale blue flowers in terminal 
panicled cymes, 5-parted small calyx, corolla with narrow funnel-form 
tube bearded inside and limb divided into 5 long linear lobes, 5 stamens 
inserted on corolla-tube and included, anthers obtuse at both ends and 
longer than the filaments, 2 ovaries, single style, rounded stigma sur- 
rounded with a cup-like membrane, and 2 long and slender many-seeded 
pods with naked cylindrical seeds abrupt at both ends and packed in 
one row. 
* Stigma with depressed-capitate or truncate entire apex : corolla not constricted under limb. 
1. A. Tabernzmontana Walt. About 9 dm high, glabrate: leaves from ovate to 
lanceolate, acuminate, 5 to 12.5 cm. long, distinctly petioled, pale beneath: corolla- 
lobes becoming linear and as long as the tube: pods slender, 5 to 7.5 cm. long.—Low 
grounds, extending from the eastern States into Texas. 
2. A. ciliata Walt. Stems (3 to9 dm. high) and commonly inflorescence and leaves 
when young villous with loose deciduous hair: leaves much crowded, linear-lanceo- 
late to narrowly linear (2.5 to 5 cm. long, 1 to 8 mm. wide), indistinctly petioled, the 
margins at length somewhat revolute: corolla-lobes at length linear-oblong and little 
shorter than the tube: pods slender and even, 2.5 to 12.5 cm.long. (A. angustifolia 
Michx.)—Dry soil, extending from the Gulf States into Texas. Represented in rocky 
prairies and at base of limestone hills by var. TEXANA, which is 3 to 6 dm. high from 
creeping woody subterranean shoots and completely glabrous, with lanceolate-oblong 
to linear leaves of firmer texture (4. angustifolia, var. Terana Gray). 
* * Stigma with two distinct obtuse lobes above the truncate body: corolla constricted (at 
least in bud) under the conspicuously shorter limb. 
3. A. tomentosa Torr. Cinereous-tomentose or puberulent, varying to glabrous: 
leaves from lanceolate to narrowly linear, sessile: corolla-lobes 4 to 6mm. long, fully 
half the length of the tube: pods torose, inclined to break into thickish articula- 
tions.—Sandy plains and ravines, western border of Texas, 
4. A. longiflora Torr. Minutely scabrous or even scabrous-pubescent, or above 
glabrous: leaves linear, sessile: corolla-lobes white, a quarter the length of the 
greenish-purple clavate tube which is over 2.5 cm. long: pods slender and continu- 
ous.—Rocky ravines, western Texas. 
2. APOCYNUM Tourn. (DOGBANE. INDIAN HEMP.) 
Perennial herbs, with upright branching stems, tough fibrous bark, 
opposite mucronate-pointed leaves, small and pale cymose flowers on 
short pedicels, 5-parted calyx with acute lobes, bell-shaped 5-cleft co- 
rolla bearing 5 triangular appendages below the throat opposite the lobes, 
5 stamens on the very base of the corolla, flat filaments shorter than 
the sagittate anthers which converge around the stigma, no style, large 
ovoid stigma, and two long and slender pods with seeds comose with a 
tuft of long silky down at the apex. 
1. A.cannabinum L. (INDIAN HEMP.) Glabrous or more or less soft-pubescent: 
stem and branches upright or ascending, terminated by erect and close many-flow- 
ered cymes, which are usually shorter than the leaves: leaves from oval to oblong 
and lanceolate, short-petioled or sessile, with rounded or obscurely cordate base: 
corolla (greenish-white) with nearly erect lobes, the tube not longer than the lan- 
ceolate divisions of the calyx.—Moist grounds and banks of streams, reported from 
Gillespie County (Jermy), though probably widely distributed in Texas, 
