Sisymbrium. | VI. CRUCIFERE. 35 
generally, but decreasing much in northern and western Scotland. 7, 
_ spring. 
X. ERYSIMUM. ERYSIMUM. 
Erect annuals or perennials, pale or hoary with closely appressed hairs, 
rarely quite glabrous; the leaves entire, or slightly toothed. Flowers 
yellow, or rarely yellowish-white. Pod linear, 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 
Cheiranthus in the seeds, from Sisymbriwm by the midrib of the valves of 
the pod being more prominent than in all the species of that genus except 
S. officinale. 
Plant slightly hoary. Leaves tapering at the base ° . lL. #. cheiranthoides, 
Plant glabrous and glaucous. Leaves clasping the stem, and 
Bounded atthe base +.  . fe fe te he ie Bay H. ontentale, 
1, EB. cheiranthoides, Linn. (fig. 73). Common Erysimum, Treacle 
Mustard,—A stiff, erect annual, 1 to 2 feet high, slightly hoary with 
closely appressed hairs. Leaves numerous, of a pale green, broadly lanceo- 
late, 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 slightly dilated. 
In waste and cultivated places, in northern and central Europe, Russian 
Asia, and northern America, becoming rather a mountain plant in southern 
Europe. Diffused over a great part of Britain, but probably in many cases 
introduced. FU. summer and autumn. 
2, HE. orientale, Br. (fig. 74). Eastern Hrysimum, Hare’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 established. 7, spring and summer. 
ee 
XI. 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, cylindrical or nearly so, more or 
less beaxed at the top beyond the end of the valves, the beak consisting 
either of the conical style alone, or including a portion of the pod itself, 
with one or more seeds in it, Seeds globular ovoid or somewhat flattened, 
the cotyledons folded longitudinally over the radicle. 
A numerous genus, spread over Hurope and northern and central Asia, 
comprising the Brassica and Simapis of Linneus, and divided by other 
botanists into from three to six or even more genera, variously defined, 
according to the peculiar views entertained by each, but all aptly united into 
D2 
