28 CRUCIFERJ. (MUSTARD FAMILY.) 
5. A. Canadensis, L. Stem stout, simple, nearly smooth above; leaves 
thin, downy, lanceolate, slightly toothed, sessile by a narrow base, the lowest | 
coarsely or pinnatifid-toothed ; siliques curved, drooping, on rough pedicels; 
seeds winged. (A. falcata, Michx.) — Dry or rocky places in the upper districts. - 
May and June.— Stems 29-39 high. Silique 2!—3/ long. Flowers white. 
Petals oblong-lirfear, not twice the length of the hairy calyx. 
6. A. leevigata, DC. \ Smooth and glaucous; stem erect; leaves linear 
or lanceolate, entire or sparingly toothed, sagittate and clasping at the base; 
pedicels short; petals (whitish) narrow, slightly exserted ; silique elongated, - 
narrow-linear, recurved-spreading ; seed winged. — Rocky places, North Caro- 
lina, Tennessee, and northward. May.— Stem 19-29 high. Silique 2/-3'- 
long. Z 
7.. SISYMBRIUM, L. Hepex-Musrarp. 
Silique linear or oblong, terete or somewhat angled, with 1-3-nerved valves. 
Seeds in a single row in each cell, oblong, marginless, Cotyledons linear-oblong, 
incumbent. — Herbs with simple or piunately divided leaves, Flowers in ra- - 
cemes, small, White or yellow. i 
1. S. canescens, Nutt. Pubescent and somewhat hoary; stem simple or - 
sparingly branched; leaves bipinnatifid, with small mostly toothed lobes; ra- - 
cemes at length elongated ; silique shorter than the spreading pedicel. (Carda- 
mine? multifida, DC.) — Waste ground, Florida, northward and westward. | 
March and April. @— Stem 10-20 high. Flowers small, greenish-white. — 
2. S. Thaliana, Gaud. Stem slender, branching, hairy at the base ; leaves 
hairy, toothed or entire, the lowest obovate or oblanceolate, tufted, the others 
small and scattered ; siliques linear, erect-spreading, twice as long as the pedi- 
cels. —Rocks and sterile soil, Georgia and northward. Introduced. March 
and April. @ — Stem 4'-8' high. Flowers white. 
3. S. officinale, Scop. Stem tall (2? -39), branching, and with the run- - 
cinate leaves pubescent ; silique subulate, nearly sessile, appressed to the rachis. . 
— Waste grounds in the upper districts, and northward. Introduced. May- 
Sept. @ — Flowers pale yellow. ; 
8. WAREA, Nutt. 
Silique linear, flattened, long-stalked, recurved ; the valves I-nerved. Seeds 
in a single row in each cell. Cotyledons oblong, flat, incumbent. — Smooth 
and erect branching annuals. Leaves entire. Flowers showy, in corymb-like 
racemes. Petals long-clawed, white or purple. re 
1 W. amplexifolia, Nutt. Leaves oval and slightly shaving : petals 
oval, ribet, silique linear. — Sand hills, Florida. September. — Stem 
