Studies in the Asclepiadaceae—VII. A new Species of Vincetoxicum 
from Alabama * 
By ANNA MURRAY VAIL 
(WITH PLATES 9 AND Io) 
Vincetoxicum Alabamense 
High climbing, sparingly hirsute with long rather weak hairs 
and a minute glandular pubescence: petioles 3-8 cm. long, chan- 
nelled ; leaf-blades 6-15 cm. long, 5~10 cm. broad, rather thin, 
ovate or oblong-cordate, acuminate at the apex, the basal auricles 
rounded and never overlapping, the sinus narrow at the base, 
sparingly puberulent and dark green above, lighter and more 
closely puberulent beneath: peduncles shorter than the petioles, 
3-6-flowered: calyx bi-glandulose, the lobes lanceolate, acute: 
corolla dull greenish-yellow, 2 cm. in diameter, 5-parted to near 
the base ; segments oval, obtuse, puberulent and minutely papillose 
on the outer surface, conspicuously reticulated within ; gynostegium 
raised on a low broad column ; crown orange-yellow, consisting of 
a low saucer-shaped ring attached to the base of the corolla, 5- 
parted, each division minutely and irregularly toothed or entire, 
appendaged within by 5 tooth-like erect crests attached to the base 
of the column; stigma white, flat, obtusely 5-angled: anther-tips 
white, scarious; pollinia obovate: ovaries minutely puberulent: 
follicles 8-9 cm. long, glandular-puberulent, closely and strongly 
muricate: seeds 8—g mm. long, obovate, granulose, tipped by a 
tuft of long silky coma. 
“Sandy hillsides on edge of woods,” Dale County, Ala- 
bama, collected by T. G. Harbison, June 3 and September 5, 
1902. 
Differing from Vincetoxicum reticulatum (Engelm.) Heller in 
the greater size of its leaves and flowers, the more strongly muri- 
cate follicles and the horn-like appendages to the crown. 
In Vincetoxicum reticulatum the leaf-blades are 3-6 cm. long, 
the basal sinus broad with often overlapping auricles ; the racemes 
are mostly the length of the petioles; the flowers are scarcely 
more than 1.4 cm. in diameter when expanded ; the crown is very 
* Presented by invitation before the Botanical Society of America, Washington, 
D. C., January 1, 1903. 
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