34 CRUCIFER^E. (MUSTARD FAMILY.) 



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

 form ; the valves obscun ly nerved. 



4. A. pfitCllS, Sulliv. Downy with spreading hairs, ereet (l-2 high); 

 itrm-lnu'cs oMony-ovate, acutish, coarsely toothed or the uppermost entire, lialf- 

 cla.-j>iiig hy the lieart-shaped base; petals (bright white) twice the length of the 

 calyx; />edicels slender, spreading ; pods spreading and curving upwards, tijqxd 

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

 Porter. May. Flowers thrice as large as in No. 5. Pods l%'-2' long. 



5. A. hii'MBtn, Scop. Rough-hairy, sometimes smoothish, strictly erect 

 (l-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. (Eu.) 



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



6. A. liBVlgata, 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- 

 s]>rcading. Rocky places, Maine to Wisconsin and Kentucky. May. Stein 

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

 A. heterophylla, Nutt.) 



7. A. CaiKKli'iisis, L. (SICKLE-POD.) Stem upright, smooth above ; 

 stun -/eaves pubescent, pointed at both ends, oblong-lanceolate, sessile, the lower 

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

 tcythe-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. TTJRRITIS, Dill. TOWER MUSTARD. 



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 turns, a tower.) 



. 1. T. glabra, L. Stem-leaves oblong or ovate-lanceolate, smooth arid glau- 

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

 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 (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, 

 Worth Illinois, and noithward. May. Root-leaves small. Petals white, 

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



3. T, brcldiyc&rpa, Torr. & Gray. Smooth and glaucous ; stem-leaves 

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



