946 ASCLEPIADACEAE 
with a salient, acute or obtuse tooth or lobe on each side near the base: horn short, 
broadly falcate-subulate, incurved over the anthers: follicles very slender, 10-12 cm. 
long, erect on erect fruiting pedicels, linear-fusiform, glabrous: seeds 6 mm. long, pale 
brown when fresh, very thin : coma 3-4 cm. long. 
In dry soil, woods and thickets, Maine and Ontario vo Minnesota to North Carolina and Arkansas. 
Spring and summer. 
16. Asclepias incarnàta L. Stems glabrous or minutely pubescent, 6-10 dm. high 
or more, usually branched and often pubescent in lines above, very leafy : leaves opposite ; 
blades manifestly petioled, 4-17 cm. long, oblong-lanceolate, acuminate at the apex, obtuse 
or obscurely subcordate at the base, thinnish, with sometimes a few scattered hairs beneath : 
umbels rather small, several, corymbose at the summit of the stem, many-flowered : pedi- 
cels 1-1.5 cm. long, minutely pubescent: corolla deep rose-purple to pale pink or rarely 
white; lobes oblong, 4-6 mm. long: hoods scarcely exceeding the stigmas, erect on the 
distinct (1-1.5 mm. high) slender column, oblong, obtuse at the apex, the rounded ventral 
margins overlapping on the inside, dorsally biauriculate-hastate at the base, slightly 
exceeded by the slender incurved horn: anther-wings minutely notched at the base: 
follicles erect on erect fruiting pedicels, 5-7 cm. long, ovoid-fusiform, acuminate at the 
apex, glabrous or minutely pubescent: seeds 7-11 mm. long, red-brown, shining, minutely 
granulose under a lens, the margins paler, very thin and papery: coma about 2 em. long. 
Inswamps, New Brunswick to the North west Territory, Kansas, Tennessee and Louisiana. Summer. 
— A. incarnata longifolia A. Gray, is between 1 and 2 m. tall, and has paler flowers and greatly elon- 
gated leaf-blades ; it occurs in Texas and New Mexico. 
17. Asclepias pülchra Ehrh. Stems hirsute-pubescent, 5-1.5 dm. high, branched 
above, very leafy to the top: leaf-blades short-petioled or some of the upper ones sessile, 
broadly lanceolate, lanceolate-oblong or oblong, 6-12 cm. long, 3-5.5 cm. wide, acute or 
acuminate at the apex, mostly rounded or subcordate and rarely subhastate at the base: 
umbels numerous, corymbose, about 3 em. broad, many-flowered : pedicels 15 mm. long, 
hirsute-pubescent: corolla small, rose-purple, rarely white; lobes obtuse, often notched : 
column 1 mm. high, very slender but distinct : hoods erect, 2 mm. high, oblong, obtuse, 
slightly exceeding the anthers, dorsally biauriculate-hastate at the base, the ventral mar- 
gins infolded : horn flat, slender, exserted-incurved over the anthers : anther-wings notched 
at the base: follicles erect on erect fruiting pedicels, 4 cm. long, slender, acuminate, 
minutely hirsute-pubescent: seeds 8-10 mm. long, 5-7 mm. wide, the apex often crenate : 
coma 2 em. long. [A. incarnata var. pulchra Pers. ] 
In moist fields and swamps, Maine to Minnesota and Georgia. Summer and fall. 
. 18. Asclepias Curassávica L. Stems somewhat woody at the base, glabrous or 
minutely pubescent above, 3-6 dm. high or more : leaves opposite ; blades 5-10 cm. long 
or more, oblong to oblong-lanceolate, commonly acuminate : umbels terminal and lateral, 
5-10-flowered : pedicels 1-2 cm. long : corolla-lobes deep red-purple, 6-8 mm. long, ovate- 
oblong : column distinct : hoods erect, 4 mm. high, ovate, obtuse at the broad apex, laterally 
compressed, shorter than the flat broad attenuate curved horn, which arises from the 
slightly gibbous base of the hood : follicles erect on erect fruiting pedicels, 3-10 cm. long, 
slender-fusiform, acuminate, glabrous or minutely pubescent and slightly glaucous: see S 
6 mm. long, rather thin: coma 3-4 cm. long. Plants very variable as to length an 
breadth of the leaves. 
In sandy soil, western Florida and Louisiana. Probably introduced from tropical America. 
Known from nearly all warm countries. Spring to fall. 
19. Asclepias perénnis Walt. Stems puberulent above, glabrous below, ND r 
the base from a short clustered rootstock, simple or sometimes branched, 3-9 dm. hig » 
slender: leaf-blades 5-15 cm. long, oblong-lanceolate or rarely lanceolate, acu 1s 
acute at each end, thin: umbels solitary or when several together cory mbose: pe gus 
1-2.5 em. long, slender : flowers small, mainly white : corolla-lobes oblong, 2-3.5 mm. bead 
tipped with dull pink on the outside : column slender but distinct: hoods oval, erect, "E 29 
obscurely sagittate-hastate on the back at the base, not exceeding the top of the x 5-8 
and shorter than the filiform incurved horn : follicles erect on erect fruiting pedice a4 5 
em. long, ovoid-fusiform, acuminate above, tapering at the base, glabrous: secs sowet 
mm. long, thin, oblong-orbicular, rounded at the apex, tapering to the much nar 
base, apparently destitute of coma, the margin 2-3 mm. wide, undulate. 
On wet and muddy shores, Indiana to Missouri, Florida, Louisiana and Texas. 
20. Asclepias Texàna Heller. Stems glabrous or minutely pubescent : urplish 
a woody base, 3-5 dm. high, cymosely branched, gray-green and glaucous mte oni Tn 
below, commonly marked with 1 or 2 narrow pubescent lines : leaves opposite ; a anl 
am. long, oval-oblong, acutish at the apex, broader, obscurely oblique or T ns ined : 
end sometimes also tapering at the base; petioles 1-14 cm. long, slightly marg 
Spring and summer. 
simple from 
