140 ENGLISH BOTANY. 
By roadsides and on old walls. Rather rare, but probably wild 
in the South of England. In Scotland, where Fifeshire is its 
northern limit, there is little doubt that it is an introduced plant, 
as, although it occurs in great abundance at St. David’s, on the 
Frith of Forth, it is only found on the ballast hills. 
England, [Scotland,] Ireland. Perennial. Summer, Autumn. 
Rootstock woody, producing numerous branched stems 18 inches 
to 3 feet high, which are somewhat woody at the base. Leaves 
crowded on the stem, pinnatifid, with few distant oblong or strap- 
shaped ascending lobes; the upper ones elliptical-strapshaped, often 
nearly or quite entire. Peduncles long, terminating the stem and 
branches. Flowers ? inch in diameter, pale yellow, in a corymb, 
which afterwards lengthens into a lax raceme. Sepals oval, glabrous, 
or hairy only at the apex, always shorter than the pedicels, and 
sometimes not half their length. Petals more than twice as long 
as the calyx, roundish, contracted into a narrow claw about one- 
third the length of the lamina. Fruit pedicels nearly as long as the 
pods, which are 1 to 14 inch long, broadly linear, attenuated at each 
end, tipped by the cylindrical style, which is about 4 inch long. 
Whole plant glabrous and glaucous, growing in bushy tufts. 
Occasionally the stem is hispid. 
Fine-leaved or Narrow-leaved Wall Mustard or Wall Rocket. 
French, Diplotaxe & Fewilles Menues. German, Doppelsame. 
SPECIES IX—BRASSICA BREVIPES. 
Puates XCIV. XCV. 
Stem very rarely at all woody at the base, generally very short. 
Leaves chiefly in a radical rosette, pinnatifid, or pinnatifid-lyrate. 
Pedicels equal to or shorter than the flowers when fully open. 
Sus-Seecres .— Brassica muralis. Bois. 
Puatt XCIV.* 
Diplotaxis muralis, Reich. Ic. Fl. Germ. et Helv. Vol. Il. Zetr, Tab, LXXXII. 
Fig. 4417. 
Diplotaxis muralis, Auct. Plur. 
Sisymbrium murale, Linn. Sm. Eng. Bot. No. 1090. 
Leaves chiefly radical. Stem with few leaves. Pedicels about 
as long as the fully expanded flowers. Petals twice or thrice as 
* The Plate is E, B. 1090, and represents the variety 3, Babingtonii. 
