CEUCIFEE^. 



tTnder hedges, in shady waste or cultivated places, over the greater part 

 of Europe and western Asia, but not an Arctic plant. Frequent in Bri- 

 tain generally, but decreasing much in northern and western Scotland, 

 Fl. spring. 



XI. ERYSIMUM. ERYSIMUM. 



Erect annuals or perennials, pale or hoary with closely appressed hairs, 

 rarely quite 'glabrous ; the leaves entire, or slightly toothed. Flowers yeUow, 

 or rarely yeUowish-white. Pod Unear, nearly quadrangular from the very 

 prominent midrib of the valves. Stigma broadly capitate, or with short, 

 spreading lobes. Seeds ovoid or oblong, the seedstalk not flattened, the 

 radicle incumbent on the back of one of the cotyledons. 



A rather numerous genus in the northern hemisphere, differing from 

 Wallflowers in the seeds, from Sisymhrium by the midi'ib of the valves of 

 the pod more prominent than in all the species of that genus except the 

 common S. 



Plant slightly hoary. Leaves tapering at the base 1. Common E. 



Plant glabrous and glaucous. Leaves clasping the stem, and rounded 



at the base 2. Eastern E. 



1. Common Erysimum. Erysimum cheiranthoides, Linn. 

 (Eng. Bot. t. 942. Treacle Mustard.) 



A stiff, erect annual, 1 to 2 feet high, shghtly hoary with closely ap- 

 pressed hairs. Leaves numerous, of a pale green, broadly lanceolate, entire 

 or slightly toothed, tapering into a short stalk at the base. Flowers small, 

 pale yellow. Pods numerous, on spreading pedicels, seldom an inch long, 

 the stigma shghtly dilated. 



In waste and cultivated places, in northern and central Europe, Russian 

 Asia, and northern America, becoming rather a moimtaiu plant in southern 

 Europe. Diffused over a great part of Britain, but probably in many cases 

 introduced. Fl. summer and autumn. 



2. Eastern Erysimum. Erysimum orientale, Br. 



{Brassica, Eng. Bot. t. 1804. Sare's-ear.) 

 An erect, perfectly glabrous, and somewhat glaucous annual, a foot high 

 or rather more. Radical leaves obovate and stalked, the stem-leaves oblong, 

 2 or 3 inches long, quite entire, and embracing the stem with prominent 

 rounded auricles. Flowers pale yellow, or whitish. Pods 3 or 4 inches 

 long, slender,* in a loose raceme, the midrib of the valves very prominent. 



In stony fields and waste places, in central and southern Europe, and 

 western Asia, extending northwards to the Baltic. In Britain it has been 

 gathered occasionally, near the southern and eastern coasts of England, but 

 appears scarcely to be permanently estabhshed. Fl. spring and swmmer. 



XII. BRASSICA. BRASSICA. 



Annuals or perennials, either glabrous or with stiff or rough hairs, the 

 lower leaves usually deeply pinnate, or lyrate, the upper ones sometimes 

 entire, the flowers yellow. Pod linear, cyhndrical or nearly so, more or 



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