Barbarea.] VI. CRUCIFERA, 27 
very rarely all the lobes are narrow, or some of the leaves oblong and 
undivided, but deeply toothed at the base. Flowers rather small, bright 
yellow. Pods usually very numerous, erect or slightly spreading, and 
crowded in a long dense raceme, each # to 3 inches long, terminated 
by an erect, usually pointed style, varying from 4 a line to 2 lines in 
length. 
Hedges, or pastures and waste places, common all over Europe, in 
Russian Asia and northern America. Frequent in Britain. Fl. spring 
and summer. It varies much in the relative size of the lobes of the 
leaves, in the size of the flowers, in the length and thickness of the 
pod, in the length of the style, &c. A form with a very short and 
thick style is often considered as a different species, under the names 
of B. precox and B. intermedia, but it passes by every gradation into 
those which have a pointed style of 2 lines, and which have again 
been distinguished under the name of B. stricta. [Five forms or species 
are recognised by botanists :— 
a. B. vulgaris proper. Flowers large, petals twice as long as the 
sepals, pods in a dense raceme, erect, acute, three or more times as 
long as their pedicels. Common. 
b. B. arcuata, Reichb. Flowers large, as in a.; pods acute, large, 
spreading on very long pedicels, style slender. ’ Rare ; Armagh in 
Treland, 
c. B. stricta, Andrz. Flowers smaller, pods dense erect in a narrow 
raceme, style slender. Uncommon. 
d. B. intermedia, Boreau. Leaves much cut, petals twice as long as 
the sepals, pods acute erect in a dense raceme much longer than their 
pedicels, style stouter. Cultivated fields. 
e. B. precox, Br. (American Cress). Leaves pinnatifid, segments 
narrow, flowers large, pods long distant obtuse, pedicels short stout, 
style very short and stout, seeds large. A garden escape; an excellent 
salad. ] 
IV. NASTURTIUM. WATERCRESS. 
Glabrous perennials or annuals, with the leaves often pinnate, or 
pinnately lobed, and small white or yellow flowers. Calyx rather 
loose. Stigma capitate, nearly sessile. Pod linear or oblong, and 
usually curved, or in some species short like a silicule, the valves 
very convex, with the midrib scarcely visible. Seeds more or less 
distinctly arranged in two rows in each cell, and not winged. Radicle 
accumbent. 
A small genus, but widely spread over the whole area of the family. 
It differs from Stsymbriwm only in the position of the radicle in the 
embryo; and the white-flowered species are only to be distinguished 
from Cardamine by the seeds forming two distinct rows in each cell of 
the pod. 
Pod usually 4 an inch long or more. 
Flowers white . : : ; : : : : 3 : . 1. N. officinale. 
Flowers yellow 5 ; : 3 ‘ . . 2. N. sylvestre. 
Pod usually ¢ inch long or less. Flowers yellow. 
Pod oblong, curved. Petals scarcely longer than the calyx . 3. N. palustre. 
Pod ovoid, straight. Petals longer than the Calyx? x 4. N. amphibium. 
i officinale, Br. (fig. 52). Common W.—Stem ‘much branched, 
sometimes very short and creeping, or floating in shallow water; 
