948 ASCLEPIADACEAE 
gins infolded, with an auriculate tooth or lobe below the middle: horn subulate, arising 
from the middle of the hood, incurved over the anthers : anther-wings auriculate-spread- 
ing : follicles erect, 9 cm. long, slender-fusiform, minutely puberulent : seeds 4 mm. long : 
coma 2 cm. long. 
In wet pine lands, near Apalachicola, Florida. Summer and fall. 
26. Asclepias cinérea Walt. Stems glabrous or nearly so, slender, erect, 3 dm. high 
or more, sometimes slightly pubescent in lines: leaves opposite, 3-9 cm. long, rather dis- 
tant; blades narrowly linear or filiform : umbels 2-6, terminal and lateral, 3-8-flowered : 
peduncles short: corolla purplish on the outside; lobes oval, 5 mm. long, with whitish 
scarious margins, ash-colored within : hoods much shorter than the anthers, whitish and 
purple-keeled, slightly pendulous at the base over the short or obsolete column, truncate 
at the apex, the involute ventral margins extended into acute erect ascending lobes or 
angles: horn erect, included, broadly triangular, inserted about the middle of the hood : 
follicles slender-fusiform, 8 cm. long, 5-6 mm. wide, attenuated at each end, erect on erect 
pedicels, glabrous: seeds 5 mm. long, with a thick coriaceous margin : coma 3 em. long. 
In rather dry pine lands, South Carolina to Florida. Summer. 
27. Asclepias Emóryi (Greene) Vail. Stems minutely and cinereously pubescent 
with somewhat curved hairs, becoming less so with age, 3-4 dm. high or more, floriferous 
for nearly their whole length : leaves 4-10 cm. long; blades elongated-lanceolate, acute, 
tapering to the short margined petioles: umbels small, sessile or very short-peduncled, 
4-6-flowered : corolla-lobes 6-7 mm. long, apparently greenish white: hoods white, 5 
mm. high and twice as high as the anthers, fleshy, adnate only at the very base, solid at 
the back and below the ventral margins free to near the base, spreading at the summit 
into a short open 2-lobed lamina: horn broad, fleshy, subulate, inflexed, arising from 
the apex of the hood, wrinkled at the insertion, downcurved, barely exserted : accessory 
processes minute near the base of the hood: anther-wings semi-rhomboid, narrow, ob- 
tusely angled below the middle, rounded at the base, tapering above, entire or nearly 
so: follicles 5.5 cm. long, erect on recurved pedicels lanceolate-fusiform, puberulent : 
"ems 7 ae long, round-oblong, granulose : coma 2-2.5 em. long. [ Podostemma Emory 
reene. 
On plains or prairies, southern Texas. Summer. 
28. Asclepias Lindheimeri Engelm. Stems minutely puberulent or minutely sca- 
brous, simple or branched, rather stout, 3-4 dm. high, decumbent or ascending: leaf- 
blades deltoid, broadly oval or oblong-oval, some of the upper ones narrower and lanceo- 
late-oblong, 5-9 em. long, obtuse or commonly broadly rounded at the apex, tapering at 
the base or each abruptly or truncately contracted into a (1-2 cm. long) flat petiole: 
umbels abundant, the upper sessile, the lower on peduncles 5 mm. long or less, few- ia 
many-flowered : corolla-lobes greenish, 1 cm. long : hoods white, over twice the height o 
the anthers, slender at the stalked base, dilated above into a 3-lobed or obscurely 4-lobed 
lamina: horn ka iod to the solid keel-like portion of the hood, slender, attenuate, 1n- 
flexed, scarcely exserted, the accessory process much shorter, erect, obtuse: anther-wings 
semi-ovate, the rounded base broader than the tapering upper portion, minutely ecu 
the middle: accessory 5 processes very broad, with acutish angles grasping the base of the 
anther-wing : follicles ovate-lanceolate, long-attenuated, 8-10 cm. long, erect on recurving 
pedicels, puberulous: seeds 6 mrn. long, round-ovate: coma 3-3.5 cm. long. 
On plains or prairies, Texas to New Mexico and Mexico. Summer and fall. 
29. Asclepias obovàta Ell Stems cinereous with soft pubescence or tomentum, 
rather stout, erect, 4 dm.-1 m. high: leaves opposite; blades oval, oblong, ör E 
them obovate, 3-10 cm. long, 1.5-4.5 cm. wide or more, mucronate-apiculate at the — 
rounded or subcordate at the base, tomentose, at length glabrate or nearly so, been 
the margins, the midvein broad and conspicuous: umbels 2-6, lateral in the upper xa. 
nearly sessile : corolla-lobes greenish yellow, oblong, about 1 cm. long: column very $ dür- 
hood poe erect, 7 mm. high, much exceeding the anthers, truncate at the apex, tral 
sally bigibbous at the base by reason of an excrescent fold on each side, the ms Marvin 
margins rounded, involute and meeting for nearly their whole length, a pair of broad ed 
fleshy processes or auricles at the base within on either side of the anther-w nis im the 
narrowly falcate, fleshy, horizontally exserted for nearly half its length, arising Hen cm 
base of the hood : anther-wings bicorniculate at the salient basal angle : follicles reda 8 
long, erect on erect fruiting pedicels, obtuse at the tapering apex, tomentulose : $ 
mm. long, thin, minutely pitted : coma 3 cm. long. 
In dry grounds. mainly near the coast, South Carolina to Florida and Texas. Summer. 
