. a 
a 
Cochlearia.] VI. CRUCIFERA, 39 
Tall erect plant, with very large oblong radical leaves E . 1. C. armoracia. 
Low diffuse plant, the leaves small and thick . ; . 2. C. officinalis. 
1. C. armoracia, Linn. (fig. 85). Digade tee oatehaek tapering 
into a long root. Radical leaves on long stalks, often 6 inches to a 
foot long, and 4 to 6 inches broad, sinuate and toothed at the edges, 
glabrous, but rough. Stems 2 to 3 feet high, erect; the leaves smaller 
and narrower than the radical ones, the lower ones often deeply toothed 
or almost pinnatifid. Flowers small and white, in numerous racemes, 
forming a terminal panicle. Pods on slender pedicels, ovoid or elliptical, 
without any prominent nerve. Armoracia rusticana, Rupp. 
A plant of south-eastern Europe, introduced by cultivation into 
northern and western Europe. It is naturalised in several parts of 
Britain. fl. summer. The pod seldom comes to perfection in this 
country. 
2. C. officinalis, Linn. (fig. 86). Scurvy-grass.—A low, diffuse, quite 
glabrous, and somewhat fleshy annual or biennial, the stems seldom 
above 6 inches long. Lower leaves stalked, orbicular, deltoid, or reni- 
form, entire or angularly toothed ; the upper ones sometimes similar, 
sometimes ovate or oblong, and often quite sessile. Flowers in short 
racemes, the petals obovate and spreading. Pods globular or ovoid, 
varying from 2 to 8 lines in diameter, pointed by the short style, the 
midrib of the valves very prominent when dry. C. polymorpha, Syme. 
In stony, muddy, or sandy soils, in the Arctic Circle, on the sea- 
coasts of northern and western Europe, and at considerable elevations 
in the great mountain-chains of Kurope. Not uncommon on the shores 
of Hngland and Ireland, still more abundant on those of Scotland, 
penetrating inland along some of its rivers, and in the Highland 
mountains. f/. all summer. It varies much in the size and shape of 
the leaves, in the size of the flowers, and the size and shape of the 
pods, and has been divided into many species. [The most prominent 
forms are— 
a. C. officinalis proper. Root-leaves orbicular or reniform, deeply. 
cordate, pods nearly globose. 
b. C. alpina, Wats. Leaves as in a, pods narrowed at both ends. 
C. greenlandica, 8m. Mountains. 
ce. C. danica, Mill. Leaves deltoid, pods as in b. 
d. C. anglica, Linn. Much larger in all its parts. Leaves oblong- 
homboid or ovate, not cordate, pods inflated, constricted at the 
suture. ] | 
XIII. ALYSSUM. ALYSSUM. 
Annuals or low branching perennials, with a hoary or short stellate 
down, and white or yellow flowers. Filaments of the stamens, or the 
shorter ones only, usually winged near the base, or thickened, or 
furnished with small teeth. Pod sessile within the calyx, orbicular 
or oval, the partition broad, the valves convex, and not veined.. Seeds 
1 to 4, or very rarely more, in each cell. Radicle accumbent on the 
edge of the cotyledons. 
An extensive genus, in Europe and northern Asia, and tolerably 
natural, distinguished from Draba chiefly by the short few-seeded pod, 
with more convex valves, or by the appendages to the base of the 
