80 THE CHTJCIFEE FAMILY. 



The genus is reduced by some to a single species, by others made to 

 include also a very few species from soutliern Europe and the Canary 

 Islands. 



1. Common TVallflovirer. Cheiranthus Cheiri, Linn. 

 (C. fruticulosiis, Eng. Bot. t. 1934. Wallflower. Gilliflower.) 



A perennial of longer duration and more woody thau the common Slock, 

 more branched and less hoary, the hairs forked at the base, and closely 

 pressed on the surface, or often quite green and nearly glabrous. Leaves 

 narrow, pointed, quite entire. Flowers rather large, generally of a rich 

 orange-yellow, and sweet-scented, but varying from pale yellow to a deep 

 red. Pods 2 to 3 inches long, the valves marked by a slightly prominent 

 midrib. 



A native of rocky situations, in southern Europe, but spreads rapidly 

 from cultivation, and is now abundant, apparently wild, on walls, old build- 

 ings, and rocky places near habitations, in many parts of central and even 

 northern Europe. In Britain very frequent under similar circumstances, 

 Fl. spring. 



III. 'WINTERCRESS. BAEBAEEA. 



Herbs, only dififering from the yellow-flowered Watercresses by their 

 longer pod, the midrib more conspicuous, and the seeds apparently arranged 

 in a single row, and from Erysimum and Sisymhrium in the radicle accum- 

 bent on the edge of the cotyledons, not incumbent on the back of one of 

 them. 



A very small genus, generally spread over the temperate regions of the 

 globe. 



1. Common 'VITintercress. Barbarea vulgaris, Br. 



(Erysimum barbarea, Eng. Bot. t. 443. Wintercress. Yellow Rochet.) 

 A perennial of short duration, stiff and erect, green and glabrous, spa- 

 ringly branched, 1 to 2 feet high. Leaves mostly pinnate, with the ter- 

 minal lobe large, broad, and very obtuse, wliilst the lower ones are few, 

 small, and narrow ; very rarely all the lobes are narrow, or some of the 

 leaves oblong and undivided, but dee| ly toothed at the base. Flowers 

 rather small, bright yellow. Pods usually vei-y numerous, erect or shghtly 

 spreading, and crowded in a long dense raceme, each one from I to 2, or 

 even 3 inches long, terminated by an erect, usually pointed style, varying 

 from i a line to 2 lines in length. 



Hedges, or pastures and waste places, common all over Europe, in 

 Eussian Asia and northern America. Frequent in Britain. Fl. spring and 

 summer. It varies much in the relative size of the lobes of the leaves, in 

 the size of the flowers, in the length and thickness of the pod, in the length 

 of the style, etc. A form with a veiy short and thick style, is often con- 

 sidered as a species, under the name of J5. prcecox (Eng. Bot. t. 1129), but 

 it passes by every gradation into those which have a pointed style of 2 lines, 

 and wliich have again been distinguished under the name of B. stricta. 



