M CRUCIFERiE. (mustard FAMILY.) 



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

 form ; the valves obscm-ely nerved. 



4. A. patens, Sulliv. Downy with spreading hairs, erect {l°-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 ; pods spreading and curving upwards, tipped 

 with a distinct style. — Eocky banks of the Scioto, Ohio, SuUivant. (Also Ten- 

 nessee.) May. — Elowers thrice as large as in No. 5. Pods 1 J' -2' long. 



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

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

 ing by a somewhat areow-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. Plowers small. (Eu.) 



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



6. A. laevig^a,ta, 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. heterophylla, Nutt.) 



7. A. Canadensis, 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, flat, 

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

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

 a scymitar. 



7. TURBITIS, Dill. Towee Mustakd. 



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

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

 (Name from turris, a tower.) 



1. X. g'lulbra, L. Stem-leaves oblong or ovate-lanceolate, 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. Stricta, Graham. Smooth (10-2° 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 matm-ity. Jefferson and Chenango Counties, New York. 

 Lake Superior, and northward. May. — Root-leaves small. Petals white, 

 tinged with purple. Ripo pods 2j'-4' long, 1" wide. 



3. X. feS'acliyciirpa, Torr. &Gray. Smooth and glaucous ; stem-leaves 

 linear-lanceolate, acute, an'ow-shaped ; pedicels of the flowers nodding, of the sliort 



