952 ASCLEPIADACEAE 
deeply cordate with rounded basal lobes, palmately veined, glabrous or nearly so above, 
the veins minutely pubescent beneath, midvein with a small cluster of subulate glands at 
the base above : cymes usually numerous, rather densely many-flowered, not exceeding the 
petioles : pedicels 4-5 mm. long : corolla-lobes ovate, 4 mm. long, linear-lanceolate, acutish 
with reflexed tips : crown-lobes ovate, barely truncate, the slender awns nearly as long as 
the corolla-lobes : anther-tips conspicuous, cordate at the base : follicles erect on spreading 
pedicels, 10-15 cm. long, glabrous, wing-angled : seeds 9-10 mm. long, thin, crenate at the 
apex: coma 4 em. long. [Enslenia albida Nutt. ] 
On river banks and in thickets, southern Pennsylvania to Kansas, Florida and Texas. Summer. 
ll. SEUTERA Reichenb. 
Slender twining vines. Leaves mostly opposite: blades narrowly linear. Flowers in 
peduncled umbels. Calyx small: lobes 5, acute, with a gland in each sinus. Corolla sub- 
rotate: lobes 5, spreading, acuminate. Crown adnate to the short column below the 
anther-wings, united at base: lobes merely notched at the apex.  Anther-wings corneous, 
angled at the base. Pollinia pendulous. Stigma conic, obscurely bifid. Follicles smooth, 
slender, essentially terete. 
1. Seutera palustris (Pursh) Vail. Stems filiform, herbaceous, glabrous, freely 
twining over grasses and low bushes : leaves 2-7 em. long ; blades linear, somewhat fleshy, 
acute, glabrous, pendent : peduncles commonly longer than the leaves: umbels several- to 
many-flowered : ealyx-lobes lanceolate, acute: corolla purplish or greenish white, 3-4 cm. 
long ; lobes ovate-lanceolate, acuminate: crown 5-lobed, adnate to the summit of the very 
short column ; lobes oblong-obovate, entire, retuse or emarginate at the apex, about one 
half the length of the corolla: anthers sagittate at base: pollinia oblong-elliptical in out- 
line on rather broad, stout caudicles: follicles slender-fusiform, acuminate, 5 em. long, 
eie seeds 3-3.5 mm. long, very thin, glabrous: coma 2 cm. long. [S. maritima 
ecne. 
In salt marshes along the coast, North Carolina to Florida and Texas. Summer and fall. 
12. VINCETÓXICUM Walt. 
Twining perennial vines or low shrubby plants, mostly pubescent. Leaves opposite : 
blades commonly heart-shaped. Inflorescence axillary, peduncled or sessile. Flowers soli- 
tary or few in small clusters, or more commonly in loosely-flowered umbel-like cymes. Calyx- 
lobes oblong or lanceolate, acute or acuminate, commonly with 1-2 glands in each sinus. 
Corolla variously colored or white, rotate: lobes 5, dextrorsely convolute in bud. Crown 
annular, saucer-shaped or cup-shaped, single or double, the outer sometimes surrounded by 
a fleshy ring or fold, simulating a third ring, often annular and cohering with the base of 
the corolla, entire, crested or appendaged within, sometimes connected with the gynostegium 
by 5 fleshy ribs. Gynostegium arising from the base of the corolla, sessile or raised on & 
column. Anthers usually with a short narrow, if any, scarious tip, borne on the margin 
of or close under the disk of the stigma, often dorsally appendaged by a short corneous 
projection ; sacs opening more or less transversely and outwardly, or from above. Pollinia 
horizontal, sometimes pointing inwards. Stigma depressed, sometimes barely conic in the 
center, sharply 5-angled, usually with radiating raised margins. Follicles thick, taper- 
ing, glabrous, muricate or warty, or 3-5-costate-angled. [Gonolobus Michx. in part. ] 
A. Stems twining: vines with large leaves. ide. 
Pollinia pyriform on broad angled caudicles : crown a low, fleshy entire or 10-undulate ring : anthers 
with a narrow dorsal projection. : follicles 
Corolla green-reticulate : crown entire: stigma raised on a slender 5-angled column: 
muricate. 
CREME slenger, unappendaged : corolla 1.4 cm. broad. ü 1. V. reticulatum. 
'olumn stout, appendaged at the base by 5 erect horn-like projections : : 
corolla 2 em. broad. H 2. V. Alabamense. 
Corolla not reticulate: crown 10-undulate, unappendaged within : follieles 
4-5-angled or costgte or winged. : 
Leaf-blades oblong-ovate or oblong-oval, thickish, abruptly acuminate > suberosum 
at the apex. 2$ i 
_ Leaf-blades broadly ovate or sometimes oblong-ovate, thin. : £ VP 
Pollinia oblong on slender twisted caudicles: crown low, 10-crenate, with 
5 erenations broader, obscurely crested within, the 5 alternate divisions 
truncate or bifid at the apex : follicles muricate. x 
a. belated dull ey apa oo purple, some of them turning yellowish. ' 
orolla greenish purple. roader, 
Alternate loner divisions of the crown truncate and bifid, thinner than the rounded, b x 
obseurely crested divisions. 
