OF ORNAMENTAL PERENNIALS. 247 
There are two varieties, one with white flowers, and another the flowers of which are of a pale blue. The plant 
is generally considered to be a biennial, but it will often live three or four years before it flowers, though it 
always perishes after ripening its seeds. It was introduced in 1783. It flowers from the beginning of June till 
the latter end of August, and is always propagated by seeds, which it ripens in abundance. 
C. AGGREGATA, Lodd. Bot. Cab., t, 505. 
This is not a very handsome species ; as though it has a small cluster of dark blue flowers at the extremity 
of the shoot, the side flowers are quite tliin and scattered, and very different from those of C. speciosa, figured in 
PI. 62, with which it is sometimes confounded. 
C. CERVICARIA, Lodd. Bot. Cab. t. 452. 
A species with undulated leaves and blue flowers. A native of Germany; introduced in 1768. 
C. EXCISA, Lodd. Bot. Cab., t. 561. 
This species takes its name from its cut flowers, the petals of which are cleft more than half-way down, and 
the divisions rolled together in such a curious way as to give them a remarkable scooped-out appearance. Tlie 
stems of this plant are remarkably slender, only growing about four inches high, and the leaves are awl-shaped. 
It is a native of the Alps in Switzerland, whence it was introduced in 1816. It is quite hardy, and should 
be grown in light loamy soil. It is propagated by dividing the roots in spring. 
C. SCHEUCHZERI, Lodd. Bot. Cab. t. 485. 
This very beautiful little species closely resembles the little hare-bell of the English fields, (Campanula 
rotundifolia,) but the flowers are larger, and the flower-stalks, instead of being naked, are furnished with 
numerous linear leaves. It is a native of the Alps in Switzerland, and it was introduced in 1813. 
There are numerous other species, but they are not common in British gardens. 
GENUS XI. 
TRACHELIUM, Lin. THE THROATWORT. 
Lin. Syst. PENTANDRIA MONOGYNIA. 
Genebic Character. — Caljx superior, fire-cleft. Corolla funnel- i Style one, Btigma globose. Capsule three-celled, opening at the bace 
shaped, tube long, limb five-lobed. Filaments not dilated at the base. by small lateral pores. 
Description, &c. — There is only one species of this genus common in British gardens. Tlie word Trachelinm 
is derived from trachea, in allusion to the supposed efficacy of the plant in all diseases of the throat. The English 
name throatwort has also the same origin. 
1.— TRACHELIUM CCERULEUM, Lin. THE BLUE THROATWORT. 
Synonymfs. — T. azureum, Gowan.; Trachelio azuro. Pan.; Vale- 
riana coerulea, Barr.; Rapun^ulus Vtilerianoides, Morr,; Cervicaria 
valerianoides, Bnuh. 
ENGRATtNG. — Bot. Reg. t. 72. 
Specific Character. — Stem branched, erect. Leaves ovate, serrated, 
ilat. Flowers in terminal corymbs furnished with numerous braoteolates. 
Description, &c. — This species is a biennial plant growing two or three feet high, and producing numerous 
corymbs of small purplish flowers. The colour of the flowers, however, varies very much in the varieties of 
this species being sometimes decidedly blue and of various shades, from a very dark to a very light tint ; at 
other times purple, and at others quite white. It is a native of the banks of the Mediterranean, and some other 
parts of Italy and Spain, but it has never been found growing wild farther north than Rome. It was introduced 
in 1640. 
