34 . CRUCIFER^E. (MUSTARD FAMILY.) 



ia and Kentucky May, — About 1° high, slender. Pods 1' long, almost fili- 

 form ; the valves obscuR ly nerved. 



4. A. jSsateBiS, Sulliv. Downy with spreading hairs, erect (1°- 2° high); 

 ftem-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 ; pods spreading and curving upwards, tipped 

 with a distinct style. — Rocky banks of the Scioto, Ohio, Sullivant. Penn., Prof. 

 Porter. May. — Flowers thrice as large as in No. 5. Pods H'-2' long. 



5. A. IsirsitlM, Scop. Rough-hairy, sometimes smoothish, strictly erect 

 ( 1 ° - 2° high ) ; stem-leaves oblong or lanceolate, entire or toothed, partly clasp- 

 ing by a somewhat arrow-shaped or heart-shaped base; petals (greenish-white) 

 small, but longer than the calyx ; pedicels and pods strictly upright ; style scarcely 

 any. — Rocks, common, especially northward. May, June. — Stem 1° - 2° high, 

 simple or branched from the base. Root-leaves spatulate-oblong, sessile or near- 

 ly so. Flowers small. (En.) 



-i- *- Seeds winged; their stalks adherent to the partition: petals narrow, whitish. 

 G. A. lifivig'/sf*!, DC. Smooth and glaucous, upright; stem-leaves partly 

 clasping by the arrow-shaped base, lanceolate or linear, sparingly cut-toothed or 

 entire ; petals scarcely longer than the calyx ; pods long and narrow, recurved- 

 spreading. — Rocky places, Maine to Wisconsin and Kentucky. May. — Stem 

 l°-3° high. Pods 3' long, on short merely spreading pedicels. (This is also 

 A. hetcrophylla, Nutt.) 



7. A. Ca.8m«lt'issis, L. (Sickle-pod.) Stem upright, smooth above ; 

 stem-leaves pubescent, pointed at both ends, oblong-lanceolate, sessile, the lower 

 toothed; petals twice the length of the calyx, oblong-linear; pods drooping, Jlat, 

 scythe-shaped. (A. falcata, Michx.) — Woods. June- Aug. — Stem 2°-3° high. 

 Pods 3' long and 2" broad, veiny, hanging on rough-hairy pedicels, curved like 

 a scymitar. 



7. TURRITIS, Dill. Tower Mustard. 



Pod and flowers, &c, as in Arabia ; but the seeds occupying 2 longitudinal 

 rows in each cell. — Biennials or rarely annuals. Flowers white or rose-color. 

 (Name from turn's, a tower.) 



1 . T. gi ;il>B'ta, L. Stem-leaves oblong or ovate-lanceolcde, smooth and glau- 

 cous, entire, half-clasping by the arrow-shaped base ; the yellowish white petals 

 little longer than the calyx ; flowers and the long and narrow (3' long) straight 

 pods strictly erect. — Rocks and fields ; common northward. June. (Eu.) 



2. T. StS'icta, Graham. Smooth (l°-2° high); stem-leaves lanceolate or 

 linear, half-clasping by the arrow-shaped base, entire or nearly so ; petals twice 

 the length of the calyx ; pedicels erect in flower ; the linear elongated flat pods up- 

 right or spreading at maturity. Jefferson and Chenango Counties, New York, 

 North Illinois, and northward. May. — Root-leaves small. Petals white, 

 tinged with purple. Ripe pods 2%' -4' long, 1" wide. 



3. T. t>r»cliyciirpa, Torr. & Gray. Smooth and glaucous ; stem-leaves 

 linear-lanceolate, acute, arrow-shaped; pedicels of the flowers nodding, of the short 



