54 BRITISH BOTANY. 



toothed. Pouches large, with a long beak (persistent style), 

 spreading. 



Var. a. pubescens. Whole plant hairy, especially the lower 

 part of the stem. 



Var. /3. glabrescens. Plant glabrous, or only with a few scat- 

 tered hairs. Pouches yellowish-green. — This form is much taller 

 than pubescens, which has been noticed only at "Wandsworth 

 Steam-boat Pier, associated with many exotics. 



Fields. Annual; June. — This plant is an introduced species. 

 C. dentata may be a synonym of C. sativa, in which the leaves 

 are sometimes entire and sometimes toothed. 



Vella, Lin. — Herbaceous or shrubby plants, with yellowish 

 flowers. Sepals erect, equal at the base. Pouch ovate, termi- 

 nated by the dilated, elliptical hardened style ; valves concave ? 

 Seeds few, globular, pendulous. 



V. annua, Lin. Cress-rocket. — e.b. 1442. l.b.s. p. 16 (ex- 

 tinct species). 



A. 2? C. 2? Lat. 51-52°. Alt.? Tern.? 



Root tapering. Stems erect, branched, leafy, rough, 6-10 inches 

 high. Leaves 1-2-pinnatifid, with linear segments. Petals small, 

 with purple veins. Pouches turgid, globular, bristly, reflexed, 

 crowned by the ovate, dilated, rigid style. Seeds brownish, com- 

 pressed, tubercular. 



At Wandsworth Steam-boat Pier, noticed first in 1852, and in 

 every subsequent year till the present (1855), in which it has not 

 been visible. In 1853 it occurred but sparingly on soil laid 

 on Battersea fields. The plant has disappeared at Battersea, 

 and the Wandsworth station is at present (October, 1855) under- 

 going changes which will probably unfit it for the growth of 

 any plants, 



ft Silicle compressed perpendicularly to the partition (Suhularia is 

 laterally compressed); partition narrow, often linear; valves keeled, 

 often winged. 



SYNOPSIS OF THE GENERA, 



Teesdalia. — Leaves radical. Stem leafless. Pouch roundish, notched and 



keeled, with two seeds in each cell. 

 Thiaspi. — Stem not leafless. Pouch roundish, notched. Seeds nwmercms. 

 HuTCHiNSiA.^Stem branched, leafy. Leaves pinnate. Pouch elliptical, with 



two seeds in each ceU. 

 Ibekis. — Pouch ovate or roundish, with one seed in, each cell. 



