CRUCIFERZ., (MUSTARD FAMILY.) 27 
5. LEAVENWORTHIA, Tor. 
Silique oblong or oblong-linear, compressed, often contracted between the 
seeds. Seeds in a single row in each cell, orbicular, flat, winged. Embryo 
straight or nearly so. — Small annual or biennial herbs, with short 1—few-flow- 
ered stems, pinnatifid leaves, and yellow, white, or purplish flowers, on elongated 
pedicels. 
1. L. aurea, Torr. Leaves mostly radical, with 4-8 oblong toothed lobes, 
the terminal one larger and rounded; raceme at length 4-10-flowered ; style 
manifest; embryo straight. — On flat rocks in the upper districts of Alabama 
and westward. — Plant 2'—6' high. Flowers yellow. 
2. L. Michauxii, Torr. Leaves as in No. 1; flowers mostly solitary, on 
radical peduncles ; style almost none ; embryo slightly curved. (Cardamine uni- 
flora, Michx.) — Rocks, Alabama and Tennessee. — Flowers purplish or white. 
6. ARABIS, L. 
Silique elongated, linear, flattened; valves l-nerved. Seeds numerous, in a 
single row in each cell, roundish, usually winged or margined. Cotyledons ac- 
cumbent. — Chiefly annual or biennial herbs. Radical leaves mostly pinnatifid ; 
those of the stem sessile and often cordate or sagittate at the base. Flowers 
white or rose-colored, in terminal racemes, 
1, A. hirsuta, Scop. Rough-hairy ; dtema:amosdy -Marplej- eraot, zig, '- 
very leafy ; radical leaves oblanceolate, obtuse, mostly entire; those of the stem 
lanceolate or oblong, clasping, sparingly toothed; silique pedicelled, narrow- 
linear, erect, pointed with the sessile stigma ; seeds narrow-margined. — Rocky or 
sterile soil, Tennessee and northward. May. @ — Stems 1°-2° high, often 
several from one root. Leaves }/-1/ long. Flowers small, the greenish-white 
petals rather longer than the calyx. 
2. A. patens, Sulliv. Downy with spreading hairs, erect (1°-2° high); 
stem-leaves oblong-ovate, acutish, coarsely toothed or the uppermost entire, half- 
clasping by the heart-shaped base; petals (bright-white) twice the length of the 
calyx; pedicels slender, spreading; silique slender and curving upward, tipped 
with a distinct style. — Rocky banks near Nashville, Aeee and Hope 
May. — Silique 13/— 2" long. 
3. A. dentata, Torr & Gray. Pubescent and roughish; stems iiid; 
diffusely branched, erect or ascending; leaves obtuse, unequally and sharply 
toothed, the lowest (2' —5! long) RE obvii: tapering into a slender petiole ; 
the others smaller, oblong, clasping and auriculate at the base; racemes at length 
elongated ; siliques scattered, narrow-linear, widely spreading, on short pedicels ; 
petals whitish, scarcely exceeding the calyx. — Tennessee and northward. hic i 
— Plant about 19 high. Silique 1! long. us 
4. A. lyrata, L. Stem smooth, Finoh HOARE buio; radical leaves 
tufted, pinnatif, ciliate, those of the stém linear GF Iamecolate and entit 5: iliq 
