OF ORNAMENTAL PERENNIALS. 67 
and tufted, and it insinuates itself firmly between the crevices of bricks and stones. It is thus ■well adapted for 
rockwork j but it is apt to become troublesome in borders, as it ripens abundance of seed, which it sows itself 
when ripe It grows best in dry situations, as even this species may be killed by a damp winter. 
OTHER SPECIES OF CORYDALIS. 
C. PAUCIFLORA, Dec. 
A native of Siberia, with large purple flowers ; introduced in 1823. 
C. MARSHALLIANA, Vec. 
A native of Tauria, introduced in 1823, with striped flowers. 
C. FABACEA, Dec. 
The flowers are large and purple. The species is a native of Germany ; introduced in 1815. 
C. ANGUSTIFOLIA, Dec. 
Flowers purple. A native of Iberia ; introduced in 1823. 
C. PiEONIjEFOLIA, Deo. 
A native of Siberia, with purple flowers j introduced in 1823. 
C. CAPNOIDES, Pursh. 
A species with white flowers, from the South of Europe ; introduced before 1596. 
C. SIBERICA, Deo. 
A native of Siberia, with yellow flowers ; introduced in 1825. 
C. URALENSIS, Deo. 
A native of Siberia, with yellow flowers ; introduced in 1823. 
There are several other species, but they are rarely met with. 
CHAPTER VII. 
CRUCIFERiE. 
CHiRiCTER OF THK OaoER.— Sopals four. PctaU four, cruciate. Stamens six, hypogynous, tetradynamous. Fruit a silique, or sllicle, 
rarely a valvelcss pericarp. (G. Don.) 
Description, &c. — Cruciferous plants are so called from the four petals of their flowers being in the form 
of a cross ; cruciferous signifying cross-bearing. All the species thrive most in rich soil, abounding with animal 
manure; and hence the great improvement produced in the culinary plants belonging to the order by cultivation. 
The wild cabbago and the wild turnip are harsh and stringy plants, and quite unlike the plants produced from 
them by sowing the seeds for several generations in rich soil. The ornamental flowers belonging to the order 
are also very greatly improved by planting in garden mould rendered rich by manure. 
K 2 
