OP ORNAMENTAL PERENNIALS. 79 
2.— ERYSIMUM LANCEOLATUM, R. Br. THE LANCEOLATE-LEAVED TREACLE, OR HEDGE 
MUSTARD. 
Spkcific Chiiucter. — Leaves lanceolate, toothed, upper ones 
almost linear, entire ; petals orbiculately-obovate ; claws of petals 
longer than the calyx ; pods erect ; stigma almost sessile. 
Synonymes. — E. diffusum, Bot. Reg. ; E. alpinum, Pers. ; 
Cheirantbus erysimoidcs, Lin. ; C. alpinus, Smith ; C. decumbens, 
Schlech. 
ENGaiviNGS.— Bot. Mag. t. 2423 ; Bot. Reg. t. 388. 
Description, &C. — ^The variety of this species, E. I. alpinum., is one of the prettiest plants that can be 
imagined, from the great profusion and rich golden hue of the flowers. It is quite a dwarf plant, seldom growing 
more than six inches high, and flowering in May and June. It is a native of the greater part of the Continent, 
and was introduced before 1597- 
OTHER SPECIES OF ERYSIMUM. 
Among the handsomest of these may be mentioned £. versicolor, a native of Persia, the flowers of which are 
■white, cream-coloured, brimstone, and golden yellow ; E. cuspidatum, the plants of which have a greyish hue, 
though the flowers are of a bright golden yellow ; E. suffrulicosum, with small pale yellow corymbose flowers ; 
and E. Eedoicskii, with large pale yellow flowers. E. Perotcskianum (already mentioned in my work on 
Annuals) is decidedly a most valuable plant, from its great hardiness, and from its producing its bright orange 
flowers at a very early season, and continuing them all the summer. 
GENUS XIV. 
.(ETHIONEMA, R. Br. THE ^THIONEMA. 
Lin. Syst. TETRADYNAMIA SILICULOSA. 
inside. Seeds ovate-oblong, appearing muricated under a microscope. 
(G. Don.) 
Generic Character.— Silicles oval, usually emarginate, Trith 
navicular valves, which are winged on the back. Cells 1 — 2-seeded. 
Larger stamens connected, or each furnished with a tooth on the 
Description, &c. — The name of this genus is derived from aitho, to scorch, and nema, a filament, in allusion 
to the burnt appearance of the filaments. There are three or four perennial species, but as they are all quite 
dwarf plants, with very small flowers, it will probably be sufficient to describe one species. They are all quite 
hardy, but from their dkninutive size they are only suitable for rock-work. 
1.— .ETHIONEMA MEMBRANACEUM, Dec. THE WINGED .^THIONEMA. 
Specific Character. — Pods 2-celled, 2-seedcd, obcordate, crowded ; 
valves winged on the back, entire ; leaves linear, crowded, lower ones 
spreading. (G. Don.) 
Synonymes. — Lepia membranacea, Desv. ; Membranous- winged 
^thionema. 
Engravings. — Swt. Brit. Flow. Gard. 2iid ser. t. 69 ; and om fig. 
10, in Plate 18. 
Description, &c.— -The stem of this little plant is frutescent at the base, and dividing above into numerous 
spreading branches. The flowers are very small, but they are pretty, and produced in great abundance. The 
species is a native of Persia, whence it was introduced in 1820. In this country it is generally grown on 
rock-work, in light sandy soil. 
