OF ORNAMENTAL PERENNIALS. 
73 
OTHER SPECIES OF APOCYNUM. 
A. HYPERICIFOLIUM, R. Br. 
This species has small white or reddish flowers, and smooth leaves, which are somewhat cordate at the base. 
It is a native of North America, where it is found from New York to Virginia, generally on the gravelly banks 
of rivers. It was introduced in 1758. 
A. SIBIRICUM, R. Br. 
A native of Astrachan, where it grows in salt marshes. The flower-stalks and calyces of the flowers are 
clothed with a powdery down. 
A. VENETUM, Lin. 
This species is a native of the south of Europe. It has red flowers, but there is a variety of it, the flowers 
of which are white. It was introduced in 1690. 
GENUS II. 
VINCA, Lin. THE PERIWINKLE. 
Lin. Syst. PENTANDRIA MONOGYNIA. 
Generic CHiaiCTER.— CaljTc five-cleft ; segments linear or subulate, 
acute. Corolla salver-shaped ; tube longer than the calyx ; throat 
bearded; segments of the limb flat, oblique, truncate at the apex. 
Stamens five, inserted in the throat, enclosed ; filaments short ; anthers 
ending each in a hairy membrane at apex, and conniving over the 
stigma ; stigma bearded, seated on a flat, orbicular disc, which is 
grooved round the circumference. Glands two, alternating with the 
ovary ; glabrous as well as it. Follicles two, erect, terete, narrow, 
dehiscing lengthwise, few-seeded. Albumen fleshy. Seeds cylindrical, 
! naked. (G. Don.) 
Description, &c. — All the kinds of Periwinkle are creeping plants, and only one of them is a perennial. 
The flowers are blue, purple, or white, and they are all natives of Europe. The word Vinca is derived from 
vinco, to conquer, because the species subdue other plants by their creeping roots. 
1.— VINCA HERBACEA, Waldst. et Kit. THE HERBACEOUS PERIWINKLE. 
Engravings. Bot. Mag. t. 2002 ; and our fig. 2, in Plate 68. | lanceolate, minutely ciliated when young. Calyeine segments subulate 
Specific Character. — Stems procumbent, rooting. Leaves oblong- | glabrous; segments of the corolla lanceolate, or somewhat falcate. 
Description, &c. — This very pretty plant is a native of Hungary, where it is found in open situations on 
chalky or sandy hills. In gardens it is an exceedingly useful plant, as it is not quite so strong-growing, or so 
destructive to otlier plants, as the shrubby kinds of Periwinkle, and yet is equally useful in covering the ground 
under trees. There are two or three varieties, generally only differing in the colour of the flowers, some being 
quite of a purplish-red, and others almost blue. 
GENUS III. 
AMSONIA, Clayton. THE AMSONIA. 
Lin. Sysi. PENTANDRIA MONOGYNIA. 
Generic Character. Plants twisted. Corolla funnel-shaped ; the throats of the tube being closed with pubescence. Follicles two ; erect. 
Seeds naked. 
Description, &c. — All the species belonging to this genus are perennials, and natives of North America. 
Hiey have erect stems, slightly tvvisted in their growth, which die down to the ground every winter, and which 
VOL. II. 
