Draba. | VI. CRUCIFERE. 4] 
A considerable genus, ranging over the northern hemisphere, ascending 
to the greatest elevations and to high Arctic latitudes, and extending along 
the great mountain-chain of America into the southern hemisphere. The 
species mostly differ from Alysswm in their longer pod, and in a peculiar 
habit approaching that of Arabis; from the latter genus they are dis- 
tinguished by the pod, which, though long for a siliculose Crucifer, is still 
much shorter, in proportion to its width, than in the ey Arabis, 
Flowers yellow (stiff tufted perennial). . ‘ ? ; . 1. D. aizoides. 
Flowers white. 
Biennials or perennials. Pedicels short and stiff. 
Stem with a few leaves, the radical ones spreading , tar BD 
Stem almost leafless, the radical ones tufted . ; ‘ > . 2. D. hirta, 
Annuals. Pedicels slender, spreading. ; 
Stem dwarf, erect, leafless. Petals deeply divided . 5 D. verna. 
Stem weak, "ascending, leafy. Petals entire. : 4, D. murals, 
1. D. aizoides, Linn. (fig. 88). Yellow Dritha, “oebek epee ee and 
branched, covered with closely-packed leaves, forming dense tufts of 2 or 3 
inches diameter. The leaves 3 or 4 lines long, sessile, linear, of a bright 
green, edged with stiff white hairs. Peduncles leafless, 1 to 4 or even 5 
inches high, bearing a few rather large yellow flowers. Pods about 4 
inches long, glabrous or slightly hairy, with a rather long style; the valves 
more convex than in the rest of the genus. 
In clefts of rocks, and stony places, in the mountain districts of central 
and southern Europe. Long cultivated in our rock-gardens, it has esta- 
blished itself in considerable abundance on rocks and old walls about 
Penard Castle, near Swansea, FV. spring. 
2. D. hirta, Linn. (fig. 89). Rock Draba.—Stock shortly tufted and 
perennial, but not of long duration. Leaves crowded, 3 to 5 or 6 lines. 
long, narrow-oblong or lanceolate, entire or slightly toothed, with a few 
stiff, simple or stellate hairs. Peduncles usually 1 or 2 inches, and leafless ; 
in luxuriant specimens twice as long, with one or two small ovate leaves. 
Flowers few and small, but larger than in D.incana. Pods 2 to 8 lines 
long, on short stiff pedicels, usually slightly hoary with a few very minute 
hairs. D. rupestris, Br. 
In the mountains of the northern or Arctic regions of Europe, Russia, 
and North America, Rare on some of the higher mountain summits of 
Scotland and north-west Ireland. #7. July. The specimens with slightly 
hoary pods (as are the Scotch ones) are by some distinguished, under the 
name of D. rupestris, from the original D. hirta of Linnzus (not found in 
Britain), in which they are almost or quite glabrous. 
8. D.ineana, Linn. (fig. 90). Hoary Draba.—Nearly allied to D. 
hirta, but very different in appearance. Often only a biennial, with the 
radical leaves spreading, and seldom forming branched tufts; ‘the whole 
plant hoary with short, simple and stellate hairs. Stems erect, 6 inches 
high or more, with several small, sessile, oblong, or lanceolate leaves. 
Flowers small, and white. Pods 3 to 5 lines long, on short, stiff pedicels, 
glabrous, or sprinkled with a few stellate hairs; the valves flat, or the 
whole pod slightly twisted. 
In rocky situations, in northern and Arctic Europe and Asia, far more 
common than D. hirta, and descending to lower elevations. Not unfrequent 
in the Scotch Highlands, and extending into northern England, north 
Wales, and some parts of Ireland. FV, summer. 
