956 ASCLEPIADACEAE 
column and is free at the short canaliculate obtuse apex : anther-tips membranous, incurved 
over the anthers: pollinia oblong, truncate at the attachment of the caudicle: follicles 9 
em. long, 3 cm. broad, narrowly oval, tapering each way, thick and coriaceous, pubescent, 
short-muricate : seeds 10 mm. long, thick and coriaceous, red-brown, crenate at the apex : 
coma 3.5 cm. long, rather coarse. 
On dry prairies, Arkansas and Texas. Spring and summer. 
13. Vincetoxicum pubiflórum (Decne. ) Vail. Stems from a slender perennial root- 
stock, branched at the base, the branches spreading or procumbent and diffuse, 2-4 dm. long, 
clothed with a short glandular pubescence and longer spreading hairs: leaf-blades broadly 
cordate or reniform, 2-4 cm. long, acutish or apiculate or some of them acuminate, the 
basal lobes rounded : peduncles none or merely a terminal one by the reduction of the upper 
leaves to bracts: pedicels 2 or 3 in a faseicle: calyx-lobes acute, very small: corolla cam- 
panulate ; lobes about as long as the tube, oblong-ovate, 4-5 mm long, dull purplish, 
acutish, minutely hirsute on both surfaces, reticulated within : crown shallow cup-shaped, 
with 10 rounded undulations, each alternate one with an adnate fleshy acute beak or horn 
terminating the adnate crest or rib within, with minute auricles at the base: stigmatic 
disk acutely angled : follicles 4 cm. long, ovate, muricate, much wrinkled: seeds 4 mm. 
long : mature fruit not seen. 
In dry grounds or thiekets, Georgia and Florida. Summer and fall. 
14. Vincetoxicum prodüctum (Torr.) Vail. Stems minutely pubescent, low and 
twining, 4 dm. long or more : leaf-blades sagittate, cordate, 3-4.5 cm. long, tapering to a 
long-acuminate apex, the basal lobes round, shorter than the (7-10 cm. long) petioles : 
peduncles axillary, as long as the petioles, 3-4-flowered : calyx-lobes with a small gland a 
` little below each sinus: corolla narrowly-campanulate, dull greenish purple, puberulous 
outside, nearly glabrous within ; lobes about as long as the tube, linear or oblong, nearly 
erect: crown nearly equalling the anthers and stigma, entire or barely undulate, thin, in- 
serted at the base of the short column and connected with it by 5 adnate crests which. are 
free at the 2-toothed or entire apex and canaliculate on the inner side: anther-wings 
small, nearly acute : stigma obtusely 5-angled : pollinia obliquely ovoid, on broad-winged 
caudicles : follicles ovate, 3 em. long or more, minutely puberulous: follicles smooth. 
On plains, Texas to Arizona and adjacent Mexico. Summer and fall. 
.. 15. Vincetoxicum parvifldrum (Torr.) Vail. Stems villous-hirsute, decumbent, 
diffuse, 1-2 dm. or 3dm. long, branched, fascicled on a slender vertical perennial rootstock : 
leaf-blades ovate or orbicular-cordate, obtuse or acutish, 1-3 em. long : peduncles 6-10 cm. 
long, slender, terminal and lateral, somewhat racemosely several-flowered : flowers short- 
pedicelled : calyx-lobes lanceolate-elliptical: corolla rotate ; lobes much longer than the 
tube, oblong, obtuse, 2.5 mm. long, thick and fleshy with a whitish scarious margin, 
papillose within : crown of 5 separate bidentate erect whitish fleshy lobes, which exceed the 
anthers, each with an erect, slightly incurved, linear, flat, obtuse or acutish process, aris- 
ing from near the base of the segment and commonly surpassing it: stigmatic disk flat or 
slightly depressed : pollinia obliquely ovoid-obovate ; caudicles broad with 1 or 2 wing- 
like appendages: follicles 3-4 cm. long, or more, ovate, tapering and obtuse at the apex, 
obtuse at the base, pubescent, tuberculate and coarsely muricate: seeds 5 mm. long, round- 
oblong, erenate at the apex, thin: coma 1 cm. long. 
In rocky soil, southern Texas. Summer. 
.. 16. Vincetoxicum  brevicoronàtum (Robinson) Vail. Stems villous-hirsute, 
diffuse, ascending, 1-3 dm. long: leaf-blades sessile or short-petioled, ovate or ae 
orbicular, 1-2.5 cm. long, 1-1.5 em. wide, cordate at the base, acute or acuminate at t x 
apex, glabrous or puberulent above, wrinkled or undulate on the margins, villous-hirsuie 
and the midrib and veins whitish beneath: flowers short-pedicelled, 3-8 at the apex of t j 
slender 2-7 cm. long axillary peduncle, minutely bracteolate : calyx-lobes oblong-lanceo 
late, acutish : corolla 2-3 mm. long, dark dull purplish; lobes erect, rather thick - 
fleshy, narrowly lanceolate, with white margins: crown of 5 short, thick, whitish rather 
fleshy truncate lobes not exceeding the stigma, each with an erect slender once Se ge: 
longer internal horn or process: anther wings very small, corneous: stigma a litt d t i 
pe pollinia subglobose : corpuscle linear-oblong, nearly as long as the mom 
icles about 4 em. long, coarsely muricate : seeds not seen. 
On sandy plains, Texas. Summer. 
Order 7. POLEMONIALES. 
Herbs, or sometimes shrubs or trees, the plants of some families puces 
Leaves with dilated blades, or scale-like. Flowers mainly perfect, various y 
