DICOTYLEDONOUS PLANTS 95 
Il. COCHLEARIA, Tourn. 
Perennial herbs. Leaves entire or pinnate. Flowers 
small, white. Sepals short. Petals with short claws. Pods 
globular or ellipsoid. 
1. C. Armoracia, L. Horsz-rapisu. A coarse herb with large 
leaves from stout, long, cylindrical rootstocks filled with a very 
sharp, biting juice. Root-leaves long-petioled, linear-oblong, obtuse, 
regularly scalloped; stem-leaves sessile. Racemes in _ panicles. 
Pods obovoid, on long, slender pedicels. Seeds seldom or never 
ripening. Probably from Europe ; cultivated and often introduced 
in damp ground. 
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Ill. SISYMBRIUM, Tourn. 
Annual or biennial herbs. Radical leaves spreading ; stem- 
leaves alternate, often eared at the base. Flowers in loose 
racemes, usually yellow, often bracted. Pods generally nar- 
rowly linear, cylindrical or 4-6-angled. Seeds many, ellip- 
soid, not margined. 
1. S. canescens, Nutt. Tansy Mustarp. Stem 1-2 ft. high. 
Leaves twice pinnately cut, usually covered with grayish down. 
Flowers very small, yellowish. Pods oblong, club-shaped, 4-angled, 
borne on pedicels projecting almost horizontally from the stem, in 
long racemes. Common westward. 
2. S. officinale, Scop. HepGE Mustrarp. Stems branching, stiff. 
Leaves runcinate-toothed or lobed. Flowers very small, pale yel- 
low. Pods somewhat 6-sided, awl-shaped, closely pressed against 
the stem. An unsightly weed in waste ground, introduced from 
Europe. 
IV. BRASSICA, Tourn. 
Branching herbs. Leaves often pinnately cut. Flowers 
in racemes, rather large, yellow. Sepals spreading. Pods 
nearly cylindrical, sometimes tipped with a beak which does 
not open. Seeds globular. 
1. B. arvensis, Boiss. CHArLocK. Stem 1-2 ft. high; it andthe 
leaves rough-hairy. Upper leaves rhombic-toothed or no. Flowers 
3-3 in. across, somewhat corymbed, bright yellow. Pods knotty, 
spreading, at least 4 of each consisting of a 2-edged, 1-seeded beak. 
A showy, troublesome weed in grain fields, introduced from Europe. 
