ASCLEPIADACEAE. Vou. III. 
22. Asclepias verticillata L. Whorled Milk- 
weed. Fig. 3404. 
Asclepias verticillata L. Sp, Pl. 217. 1753. 
Roots slender, fascicled; stem slender, simple or 
branched, pubescent in lines above, leafy, 1°-24° 
high. Leaves narrowly linear, sessile, verticillate in 
3’s-7’s or some of them alternate, glabrous or very 
nearly so, their margins narrowly revolute; umbels 
numerous, many-flowered; peduncles slender, 2-13’ 
long; pedicels almost filiform, shorter than the pe- 
duncles; corolla greenish white, its segments oblong, 
12-2” long; column about 4” high; hoods white, 
oval, entire, about equalling the anthers, much 
shorter than the subulate incurved horn; follicles 
erect on the erect fruiting pedicels, narrowly spindle- 
shaped, glabrous, 2’-3’ long. 
In dry fields and on hills, Maine and southern On- 
tario to Saskatchewan, south to Florida, Mexico and 
New Mexico. July-Sept. 
23. Asclepias galioides H.B.K. Bedstraw Milk- 
weed. Fig. 3405. 
Asclepias galioides H.B.K. Nov. Gen, 3: 188. 1818. 
Glabrous, except the minutely pubescent stems and pedi- 
cels. Stems erect, 1° high or more, from a horizontal root- 
stock; leaves erect or spreading, in whorls of 2-6, narrowly 
linear, 2’-3’ long, the margins revolute; peduncles longer 
than the pedicels and shorter than the leaves; umbels 
g’-13” in diameter; flowers greenish-white; corolla-seg- 
ments 2” long; hoods as high as the anthers, broadly 
rounded at the summit, dorsally hastate-sagittate, the ven- 
tral margins slightly involute, entire; horn arising from 
the base of the hood, long-exserted over the anthers; 
anther-wings minutely notched at the base; follicles erect 
on erect fruiting pedicels, attenuated, 2’-22’ long, glabrous 
or minutely puberulent. 
Kansas to Colorado, Arizona and Mexico. May-July. 
24. Asclepias pimila (A. Gray) Vail. 
Low Milkweed. Fig. 3406. 
Asclepias pumila Vail; Britton & Brown, Ill. Fl. 3: 
12, 1898. 
Asclepias verticillata var. pumila A, Gray, Proce. 
Am, Acad. 12: 71. 1876, 
Stems 4’-10’ high, tufted from a woody root. 
Leaves very numerous, crowded, sometimes ob- 
scurely whorled, filiform-linear, 1’-2’ long, 
smooth or minutely roughened, the margins rev- 
olute; umbels 2-several, short-peduncled, few- 
flowered; pedicels filiform, puberulent, 3’~4” 
long; corolla greenish white, its segments ob- 
long, 14”-2” long; column short; hoods white, 
erect, oblong, entire, equalling the anthers, 
shorter than the slender incurved horn; follicles 
erect on erect fruiting pedicels, narrowly spindle- 
shaped, 13’-3’ long, finely puberulent. 
Dry plains, Iowa to South Dakota, Arkansas, 
Texas, Wyoming, Colorado and New Mexico. 
