




OF ORNAMENTAL EXOTIC PLANTS. 183 
are remarkable for their colour, as they are orange veined with red, a colour which is never seen in any of the 
other Campanulaceew. The species is valuable for flowering in autumn and winter, and continuing till about 
March, a season when so few other greenhouse plants are in flower. After flowering, the stem dies down, and 
the root continues dormant all the summer, when it needs but very little water. In October the stem generally 
begins to push forth, and most gardeners at this season, if convenient, either plunge the pot in a hotbed or place 
it in a stove in order to make it produce abundance of flower-buds. It must, however, be brought back to the 
greenhouse as soon as the buds are formed. The stem grows five or six feet high. The plant is propagated by 
dividing the roots, which must be done very carefully, as they are very fleshy, as if they are broken or wounded 
the milky juice will flow out abundantly; and if the roots are planted before the wounds have dried up, they 
generally rot in the ground. The best time for parting the roots is in July, as soon as the stalks have decayed. 
The soil most suitable for this plant is a mixture of loam and peat. 
GENUS II. 
ROELLA Lin. THE ROELLA. 
Lin. Syst. PENTANDRIA MONOGYNIA. 
Generic Caaracter.—Calyx and corolla five-lobed. Stamens five, Capsule two-celled, always terminated by the permanent calycine 
segments, dehiscing irregularly at the apex. (@. Don.) 
Description, &c.—The plants belonging to this genus are small shrubs, with some few herbaceous plants, 
all the species being natives of the Cape of Good Hope. Only one kind is common in British greenhouses. 
The name of the genus was given in honour of Professor Roell of Amsterdam. 

1.—ROELLA CILIATA Lin. THE PRICKLY ROELLA. 
Eneravines.— Bot. Mag., t. 378 ; Paxt. Mag. of Bot., vol. vii, | upper ones longer than the others and entire. Flowers solitary. 
p. 245. Lobes of the calyx ciliated and laciniatedly toothed. Corolla longer 
Spreciric CuaracTer.—Leayes erect, linear, acuminated, ciliated; | than the calycine lobes. 
Description, &c.—The flowers of this plant are very singular from possessing five distinct shades of colour. 
At the bottom of the flower there is a large space of white or rather cream-colour; next is a circle of deep blue, 
so dark as closely to resemble black ; the next circle is greyish-blue resembling satin ; and the next nearly white, 
the outer part of the flower being of a pale pinkish purple. The flowers are solitary and terminal, and they are 
surrounded by imbricated leaves. The shrub is of low growth, and it is a native of the Cape, whence it was 
introduced in 1774. It is usually increased by cuttings, but they are rather difficult to strike. 
« 
CHAPTER XXXVIII. 
— 
LOBELIACE A. Dec. 
EssentiaL Cuaracter.—Calyx superior, five-lobed or entire. Co- | cohering. Ovary inferior, with from one to three cells. Ovules very 
rolla monopetalous, somewhat valvate in estivation, irregular, inserted | numerous, either attached to the axis or parietal. Style simple. 
in the calyx, five-lobed or deeply five-cleft. Stamens five, inserted | Stigma surrounded by a cup-like fringe. Fruit capsular, one or more 
in the calyx alternately with the lobes of the corolla. Anthers | celled, many-seeded, dehiscing at the apex. (Lindley.) 
Description, &c.—This order was formerly included in Campanulacee, from which it differs in the style 






