138 
leaves ovate-cordate. h.%.S. Native of America. Cynan- 
chum hírtum. Lin. hort. cliff. p. 79. Willd. spec. 1. p. 1256. 
—Mor. hist. 3. p. 511. sect. 15. t. 3. f. 61. Stems chinky at 
bottom. This is a very doubtful plant. Leaves larger than in 
G. suberüsus ; and the flowers are larger and purplish. 
Rough Gonolobus. Shrub tw. 
15 G. prostra‘tus (R. Br. l. c.) stems prostrate, downy ; 
leaves reniformly cordate, acute, tomentose beneath; umbels 
small, few-flowered; segments of corolla linear, obtuse. 2. YE 
G. Native of Mexico. Cynanchum prostratum, Cav. icon. 1. 
p. 5. t. 7. Willd. spec. 1. p. 1257.  Corollas green, small. 
Peduncles downy, almost the length of the leaves. 
Prostrate Gonolobus. Fl. July, Aug. Clt. 1823. 
trate. 
16 G. vxpuraA' rus (R. Br. l. c.) glabrous; leaves oblong, 
acuminated, attenuated at the base, undulated ; umbels capitate ; 
calycine segments ovate, concave, spreading ; segments of corolla 
bluntish, much shorter than the tube. h.%.S. Native near 
Carthagena, on Mount de la Popa. Tube of corolla depressedly 
globose. Corollas small, cinereous outside, and dirty purple inside. 
Undulated-leaved Gonolobus. Shrub tw. 
17 G. atrissimus (Roem. et Schultes, syst. 6. p. 65.) stem 
tomentose or downy; leaves cordate, tomentose on both sur- 
faces; umbels dense, capitate; calycine segments lanceolate, 
concave, tomentose outside, length of the tube of the corolla ; 
segments of the corolla roundish, flat, obtuse. 4%. C. S. Native 
of woods, about Carthagena. Cynanchum altissimum, Jacq. 
amer. 84. t. 87. Wahl, ecl 2. p. 23. Corollas dirty purple. 
Tallest Gonolobus. Fl.? Pl.tw. 
18 G. rintrérmis (Roem. et Schultes, syst. 6. p. 65.) gla- 
brous; leaves ovate, acuminated, shining; umbels globose ; 
calycine segments lanceolate, concave, acuminated ; segments of 
corolla ovate, acuminated, pilose beneath. %.^. S. Native of 
Carthagena, among bushes. Cynanchum filifórme, Jacq. amer. 
p. 86. t. 60. f. 1. Cynanchum leucánthum, Jacq. amer. pict. t. 
86. Stems filiform, shining. Peduncles twice longer than the 
petioles. Flowers very small, white. 
Filiform-stemmed Gonolobus. Pl. tw. 
19 G. A'rsus (Poir. suppl. 2. p. 815.) glabrous ; leaves ovate, 
acute, white below; umbels many-flowered. 2/.^.S. Native 
of Peru. Asclépias alba, Cav. icon. p. 136. t. 310. Leaves 
subcordate, 2 inches long. Umbels sometimes twin.  Corollas 
whitish-grey, 1 an inch in diameter. 
White-flowered Gonolobus. Pl. tw. 
20 G. oprusrrorrus (Roem. et Schultes, syst. 6. p. 66.) leaves 
roundish-cordate, soft and tomentose beneath. 2t. C. S. Na- 
tive of South America, Cayenne.?  Asclépias (Gonolóbium) ob- 
tusifolium, Pers. ench. 1. p. 274. 1 
Blunt-leaved Gonolobus. Pl. tw. 
21 G. piapema‘tus (Ker. bot. reg. t. 252.) hairy; leaves ob- 
long-cordate ; segments of corolla ovate, furnished with a corona 
in the throat. h.%.S. Native of Mexico. Flowers green. 
Crowned Gonolobus. Fl. Sept. Oct. Clt. 1812. Shrub tw. 
22 G. ogrìeuus (R. Br. l. c.) stems hairy ; leaves ovate-cor- 
date, villous, acute; umbels much shorter than the leaves; 
pedicels length of peduncles; calycine segments narrow-lanceo- 
late, acute, villous ; segments of corolla ovate, acuminated, with 
oblique points, and revolute edges. 34. ^. S. Native of Caro- 
lina; but the plant has never been met with by Pursh. Cyndn- 
chum obliquum, Jacq. coll. 1. p. 148. icon. rar. 2. t. 841. Willd. 
spec. 1. p. 1256. Flowers fetid, an inch in diameter, brownish 
purple. Nectarium purplish. Anthers yellow. 
Oblique-flowered Gonolobus. Fl. July, Aug. 
Pl. tw. 
23 G. NurTALLIA'NUs (Spreng. syst. 1. p. 845.) glabrous; 
leaves reniformly cordate, acuminated, upon longish petioles, 
12 
Pl. pros- 
Clt. 1818. 
ASCLEPIADEA. XXXIX. Gonotosus. 
auriculate at the base; segments of corolla linear-oblong, ob- 
lique; follicles ribbed. 4%. H. Native on the banks of the 
Mississippi, near St. Louis. G. viridiflorus, Nutt. gen. amer. 
1. p. 163. Flowers greenish. 
Nuttall’s Gonolobus. Fl. July, Aug. Clt. 1822. Pl. tw. 
24 G. uxirrónus (H. B. et Kunth, nov. gen. amer. 3. p. 207. 
t. 238.) branches and leaves downy; leaves ovate-oblong, much 
acuminated at the apex, and sagittately cordate at the base; 
peduncles solitary, 1-flowered, about the length of petioles ; 
calycine segments lanceolate, villous; segments of corolla ob- 
liquely ovate-oblong, acuminated, bearded on one side, twice 
longer than the calyx. h.^. S. Native near the town of 
Mexico. Flowers as large as those of Philadélphus coronaria. 
Corona in the bottom of the corolla, short, annular, undulated. 
Very like Cyndnchum denticulàtum, Vahl. 
One-flowered Gonolobus. FI. July. Cit. 1825. Shrub tw. 
25 G. artstotocuioipes (H. B. et Kunth, nov. gen. amer. 3. 
p. 208.) branches downy, and leaves beneath; leaves ovate, 
short-acuminated at top, and deeply cordate at the base ; umbels 
many-flowered, hardly exceeding the petioles; peduncles and 
pedicels downy ; calycine segments ovate, acutish; segments of 
corolla ovate-oblong, acute, beardless, 4 times longer than the 
calyx. 5.^. S. Native of the province of Caraccas, in humid 
places, near Guigne, and at Lake Tacaragua. Corolla yellow. 
Corona and anthers as in G. ripdarius. 
Aristolochia-like Gonolobus, Fl. March. Shrub tw. 
26 G. rroccósus (Bertol. ex Spreng. syst. add. p. 110.) leaves 
cordate, acuminated, tomentose beneath ; flowers glomerate ; 
follicles echinated. 5. ^. S. Native of Guadaloupe. 
Floccose Gonolobus. Shrub twining. 
27 G. pvavucirLorus (Spreng. syst. 1. p. 846.) shrubby, gla- 
brous; branches downy; leaves oblong, obtuse; peduncles 
usually 3-flowered, axillary. h.%.S. Native of Hispaniola, 
Fen-flowered Gonolobus. Shrub twining. 
28 G. rrpa‘rius (H. B. et Kunth, l. c.) branches pilose ; 
leaves ovate, acuminated at apex, deeply cordate at base, rather 
pilose beneath; umbels many-flowered ; peduncles and pedicels 
downy ; calycine segments oblong-lanceolate ; segments of co- 
rolla oblong-acute, beardless, 3 times longer than the calyx. 
h. ©. S. Native of New Granada, on the banks of the river 
Magdalena, between Mompox and Morales. Corolla green, 
with a short, undulately-curled margin. 
River-side Gonolobus. Shrub tw. 
29 G. panna rus (H. B. et Kunth. l. c. p. 209. t. 239.) 
branches downy ; leaves ovate, 
acuminated at top, and cordate 
at the base, with a wide recess, 
glabrous ; umbels many-flower- 
ed, about the length of the 
leaves; pedicels glabrous, longer 
than the peduncle ; calycine seg- 
ments oblong-lanceolate, acumi- 
nated (f. 17. a); segments of 
corolla obliquely ovate, acumi- 
nated (f. 17. b. c.), bearded on 
one side, twice longer than the 
calyx. h. ^. S. Native of 
Mexico,near Campeche. Flowers 
as large as those of Períploca 
Greca, 5-7 in each umbel. Co- Lf 
rona very short, disk-formed, a d. T 
composed of short, fleshy, bidentate teeth or threads surround- 
ing the stamens (f. 17. d.) 
Bearded-flowered Gonolobus. Shrub tw. 
Cult. For culture and propagation see Ozypétalum, p. 148. 
FIG. 17. 
