ASCLEPIADACEAE 939 
crown consisting of 5 turgid fleshy or hard scales, or flattish appendages, attached in a 
circle at the base of the sessile or slightly stalked gynostegium (column), forming a hollow 
entire or undulate spreading surface near the level of the conical stigmas. Follicles naked, 
slender. The plants flower mainly during the summer.  [ Philibertia B. & H., not H.B.K.] 
Gynostegium distinctly raised on a stalk or column : follicles fusiform, attenuate at en end. 
. P. crispa. 
Gynostegium sessile. 
Leaf-blades ovate-oblong or lanceolate-oblong: peduncles much longer than the 
leaves. 2. P. clausa. 
Leaf-blades cordate at the base, sagittate to almost hastate: peduncles as long as : 
the leaves or a little longer. 8. P. cynanchoides. 
1. Philibertella críspa (Benth.) Vail. Stems cinereous-puberulent, becoming gla- 
brous, pale gray-green, 1-10 dm. long or longer: leaves 4-8 cm. long; blades varying 
from linear-lanceolate and long-acuminate to linear or lanceolate, with a hastate or 
auricular-cordate base, the margins undulate-crisped or entire, usually puberulous, and the 
midvein conspicuously white above: peduncles longer than the petioles, 5-10-flowered : 
calyx-lobes linear-lanceolate, puberulous: corolla 15 mm. long, broad, dull greenish 
purple; lobes oblong, obtuse, ciliolate, obscurely undulate, glabrous above, puberulous 
beneath: outer crown deep saucer-shaped : scales of the stamineal or inner crown truncate 
at the apex with a slightly protruding angled ridge midway between it and the base: fol- 
licles 6-13 cm. long, slender, somewhat puberulous: seeds about 7 mm. long, minutely 
tuberculate or granulose, margins slightly revolute when old: coma 3-3.5 cm. long. 
In dry soil, Texas to Arizona and Mexico. 
2. Philibertella claüsa (Jacq.) Vail. Stems glabrous, or minutely pubescent at the 
nodes: leaves 3-8 em. long; blades ovate-oblong or lanceolate-oblong, acute or acuminate 
at the apex, rounded or subcordate at the base, glabrous or glabrate, usually leathery, 
commonly with a cluster of small bristle-shaped glands at the base of the midvein, which 
is sometimes pubescent beneath : peduncles twice as long as the leaves or more: flowers 
many : pedicels 1.5-2 cm. long, hirsute or minutely tomentose : calyx-lobes oblong-lanceo- 
late, acute, pubescent: corolla white, 1-1.8 cm. broad; lobes oblong, fimbriate-ciliate, 
pubescent beneath : outer crown shallow and appearing as if contiguous with the oblong- 
oval scales of the stamineal crown: follicles somewhat oblique, many-seeded, 4-7 cm. long, 
ovate-lanceolate, attenuate above, obtuse at the base, puberulous, becoming glabrate : seeds 
3 mm. long, ragged or erose along the apex, granulose on the outside, granulose and 
slightly pitted and with a prominent ridge or vein down the center on the inside: coma 
about 2.5 cm. long. 
In sandy soil, Indian River region and the Keys, Florida. Also in the West Indies. 
3. Philibertella cynanchoides (Decne.) Vail. Stems glabrous or nearly so : leaves 
cm. long; blades deeply cordate, sagittate or almost hastate, cuspidate or short- 
acuminate, with a few obscure elevated glands near the base of the midvein above, and 
rarely a few appressed hairs: peduncle about 3 em. long: flowers 15-25 in an umbel : pedi- 
cels very slender, puberulent, 1.5-2 cm. long : calyx-lobes ovate, acute, puberulent : corolla 
white or cream-colored, with a few faint traces of purple near the apex of each acute lobe 
ciliolate, minutely puberulent beneath : outer crown very shallow : scales of the stamineal 
crown broadly oval, obtuse or acutish, slightly flattened: follicles 3-7 cm. long, long- 
attenuate at the apex: seeds about 6 mm. long, the margin undulate at the apex by reason 
of the excrescent pitted tubercles, the outer surface somewhat tuberculate and pitted, the 
inner surface more prominently tuberculate and granulose : coma 3-3.5 cm. long. 
Along rivers, southern Utah to Texas, Arizona and Guatemala. 
3. PODOSTIGMA Ell. 
Perennial herbs, with erect stems. Leaves opposite. Peduncles terminal and axil- 
lary, umbellately several-flowered. Calyx-lobes longer than the tube, acute. Corolla 
with a 5-angulate base,-and 5 erect oblong obtuse or acutish lobes. Crown consisting of 5 
incurved pitcher-shaped bodies with involute ventral margins, remote from the anthers at 
the base of the long column ; the latter very slender, nearly as high as the corolla-lobes. 
Anther-wings widened toward the truncate salient base, accompanied by 5 small gland-like 
processes alternating with them. Stigma concave. Follicles linear-fusiform, naked. 
1. Podostigma pedicellàta ( Walt.) Vail. Foliage pubescent. Stems rarely branched 
above, 2-4 dm. high : leaf-blades linear-lanceolate or linear-oblong, nearly sessile, 2-6 cm. 
long, often revolute, scabro-pubescent on both surfaces, often becoming glabrate in age: 
peduncles 2-4 or rarely 5, 5-12 mm. long, several-flowered : corolla 5-10 mm. long, yel- 
