OP ORNAMENTAL PERENNIALS. 
77 
7.— ASCLEPIAS AM(ENA, Michx. THE HANDSOME SWALLOW-WORT. 
Engraving. — Sweet’s Brit. Flow. Gard., 2d. ser., t. 82. I beneath. Umbel close, many-flowered, terminal; appendages three 
Specific Character. — Stem simple, swollen at the joints. Leaves times as long as the stamens ; erect, 
on sliort petioles, oblong-oval, ending in an acute point ; pubescent I 
Description, &c. — This is one of the strongest species of the genus, and when grown in peat and kept moist 
it will attain the height of 5 or 6 feet, spreading widely, with strong thick stems and large leaves. It is a native 
of North America, from New England to Virginia, and it was introduced in 1732. It appears quite hardy in 
British gardens. 
OTHER SPECIES OF ASCLEPIAS. 
These are very numerous, but all the hardy ornamental kinds have been described above. 
GENUS II. 
GONOLOBUS, E. Br. THE GONOLOBUS. 
Lin. Syst. PENTANDRIA DIGYNIA. 
Generic Character. — Masses of pollen ten ; smooth ; transverse. Corolla subrotate. Seeds hairy. 
Description, &c. — Alt the species belonging to this genus are climbing-plants, either herbaceous or shrubby, 
with opposite, cordate leaves, and umbels of flowers which are either axillary or terminal. They are all natives 
of America ; but the greater part of them require a stove in this country. The name Gonolobus is from two 
Greek words signifying an angled pod. 
1.— GONOLOBUS HIRSUTUS, Michx. THE HAIRY GONOLOBUS. 
Specific Character. — Stem and petiole very hairy. Leaves acu- 
minate and pubescent. Segments of the corolla oblong, oval, obtuse. 
Follicles oblong, muricate. 
Description, &c. — The stems of this plant are climbing, and thickly clothed with a dense, rusty pubescence. 
The leaves are opposite, hairy on both sides, and very strongly veined. The lower leaves are very large, being 
frequently 5 inches long, and nearly as much broad ; they are cordate, with the lobes overlapping at the base. 
The seed-vessels are oblong, hooked at the points, and covered with warts. The species is a native of North 
America from Pennsylvania to Carolina, where it grows in the hedges, spreading over them in the same way as 
the common traveller’s-joy does in England. It was introduced in 1806, and is propagated by seeds, which it 
ripens freely. 
2.— GONOLOBUS DISCOLOR, Dec. THE TWO-COLOURED GONOLOBUS. 
Synonymes. — Cynanchum discolor. Banks ; Virginian Cynanchum. I Spectfic Character. — Stem hairy. Umbels axillary. Segments 
Engraving. — Bot. Mag. t. 1273. | of the corolla linear- lanceolate. 
Description, &c. — The flowers of this species are called two-coloured, because the divisions of the calyx 
alternate with the petals in such a manner as to seem to form a part of the corolla. It is a native of Virginia, 
and was introduced in 1809, 
Synonyme. — Vincetoxicum acanthocarpos, Walt. 
Engravings. — Sweet’s Brit. Flow. Gard., t. 1 ; and our fig. 3, in 
Plate 68. 
