170 ENGLISH BOTANY. 
sagittate at the base, entire. Petals narrowly oblanceolate, scarcely 
twice as long as the sepals, erect. Pods erect; valves with a 
dorsal nerve; style obsolete. Seeds in 2 rows, shortly rhom- 
boidal-oval, plane or convex, without a wing, but surrounded by a 
dark brown line. 
On dry banks, roadsides, and stony places. Rather rare and 
local; and though it occurs in a good many of the English counties 
it is very scarce in Scotland, where Dumbartonshire and Perthshire 
appear to be its northern limits. It is not in Mr. Moore’s Irish 
list, but marked as occurring in Ireland in the last edition of 
Professor Babington’s Manual. 
England, Scotland, Ireland. Biennial or Annual. Summer. 
Stem erect, 2 or 8 feet high, nearly simple or slightly branched 
in the upper part. Radical leaves in a rosette, generally withering 
before the plant flowers ; stem leaves numerous, 1 to 3 inches long. 
Flowers cream-colour, about + inch across. Pedicels about 4 inch 
long. Pods 2 to 2} inches long by 3'5 inch broad. Seeds very 
small. Radical leaves, lowest stem leaves, and base of the stem 
green, with soft hairs, generally bi- or tri-furcate. Upper part of 
the stem and its leaves smooth, very glaucous. 
The only character which separates the genus Turritis from 
Arabis‘is the seeds being in a double row instead of in one row, 
as in the latter; but the division appears to be unnatural, and I 
follow Mr. Bentham and those Continental authors who unite them. 
Smooth Tower Wall Cress or Mustard. 
French, Arabis Glabre. 
GENUS XIT—BARBAREA. BR. Brown. 
Sepals sub-erect, equal, or the lateral ones slightly gibbous at 
the base. Petals equal, entire, with moderately long claws. 
Filaments without wings or teeth. Pod linear, quadrangular, com- 
pressed; valves with a strong dorsal nerve or keel; style short ; 
stigma entire or slightly bilobed; replum transparent. Seeds 
oblong-ovoid, compressed, not winged, punctate, disposed in one 
row in each cell of the pod. 
Biennial or perennial herbs with angular stems and glabrous 
shining leaves; the lower ones lyrate, the upper toothed or 
pinnatifid. Flowers yellow, disposed in corymbs or short racemes, 
which afterwards elongate. 
French, Barbarée. German, Barbaree. 
