GENUS 1. MILKWEED FAMILY. 
Leaves mostly verticillate in 3’s—6’s, narrowly linear. 
Hoods entire. 
Hoods dorsally hastate-sagittate. 
Leaves scattered, densely crowded, filiform-linear, 
1. Asclepias tuberdsa L. Butterfly-weed 
or -flower. Pleurisy-root. Fig. 3383. 
Asclepias tuberosa L. Sp. Pl, 217. 1753. 
Hirsute-pubescent; stems stout, simple, or 
branched near the summit, ascending or erect, 
very leafy, 1°-2° high, the milky sap scanty. 
Leaves alternate, lanceolate or oblong, acute or 
sometimes obtuse at the apex, narrowed, rounded 
or cordate at the base, sessile or short-petioled, 
2’-6’ long, 2-12” wide; umbels cymose, terminal, 
» many-flowered; peduncles shorter than the leaves ; 
pedicels 3’-1' long; corolla-segments about 3” 
long, greenish orange; corona-column about 32” 
long; hoods erect, oblong, bright orange, or yel- 
low, 2-3 times as long as the stamens, longer than 
the filiform horns; fruiting pedicels decurved; 
follicles nearly erect, finely pubescent, 4’-5’ long. 
In dry fields, Maine and Ontario to Minnesota, 
Florida, Texas, Chihuahua and Arizona. Consists of 
numerous races, differing in shape and size of the 
leaves and color of the Aowers. June-Sept. Wind- 
or orange-root. Canada-, flux-, tuber- or white-root. 
Orange swallow-wort. Yellow milkweed. Indian-posy. 
22, A, verticillata. 
23. A. galioides. 
24. A. pumila, 
3. Asclepias lanceolata Walt. Few-flowered 
2. Asclepias decimbens L. Decumbent 
Butterfly-weed. Fig. 3384. 
Asclepias decumbens L. Sp. Pl. 216. 1753. 
Hirsute-pubescent; stems decumbent, 2°-3° 
long, the ends ascending or erect. Leaves sessile 
or short-petioled, oblong or elliptic, obtuse at the 
apex, narrowed and often inequilateral at the 
base, 1’-3’ long, 4’-22’ wide, the upper opposite, 
the lower commonly alternate, the uppermost 
very small; umbels several or numerous, many- 
flowered, racemose along the branches, one 
usually in each of the upper axils; peduncles 
stout, short; pedicels slender, pubescent, about 
3’ long; corolla-segments oblong, acutish, dark 
orange, about 3” long; column about 4” high, 
the hoods erect, oblong, orange, longer than the 
subulate horn; follicles slender. 
In dry fields, Illinois and Ohio to North Carolina 
and Florida. Creeping milkweed. June-Aug. 
Milkweed. Fig. 3385. 
Asclepias lanceolata Walt. Fl. Car. 105. 1788. 
A, paupercula Michx. Fl. Bor. Am. 1: 118, 1803. 
Glabrous; stem slender, usually simple, naked 
above, 2°-4° high. Leaves opposite, distant, linear 
or narrowly lanceolate, elongated, acuminate, nar- 
rowed at the base, short-petioled, 4’-10’ long, 27-7” 
wide, roughish on the margins, the primary nerves 
widely spreading; umbels few-flowered, solitary or 
2-4 at the summit; peduncles about equalling the 
slender puberulent pedicels; corolla-segments oblong, 
4’-5” long, deep red; column thick, about 1” high; 
hoods obovate or oblong, obtuse, orange, 2-toothed 
near the base, nearly twice the length of the anthers 
and longer than the subulate incurved horn; fruit- 
ing pedicels decurved; follicles erect, minutely 
puberulent, fusiform, about 4’ long. 
In swamps, southern New Jersey to Florida and 
Texas, mostly near the coast. June-Aug. 
