CHEIRANTHUS. XIII. CRUCIFER^. 169 



ment largest. Upper leaves in 3 lanceolate segments placed at right angles. 

 Flowers small, yellow, terminating the raceme, which becomes 1 2f long and 

 environed by the appressed, sessile pods. Jn. Sept. Medicinal. 



2. S. THALIANA. Gay. (Arabis. Linn.} Thalian Hedge Mustard. 

 Lvs: subdentate and pilose, radical ones numerous and petiolate, oblong, 



cauline ones lanceolate ; col. much shorter than the pedicels ; siliques ascending', 

 twice longer than the pedicels. Rocks and sandy fields, Vt. to Ga. W. to 

 Ky. Stem 4 12' high, erect, with slender, erect branches, striate, pilose, often 

 purple at base. Root leaves rosulate, 1 2' long ; cauline denticulate, citfiate, 

 sessile, 6 12" by 1 3". Pedicels spreading, 3 5" long. Flowers small, 

 white. Siliques slender, straight, 710" long. Styles scarcely any. May. 



3. S. TERES. T. & G. (Cardamine. Michx.) 



St. erect, branched ; Ivs. all somewhat lyrately pinnatifid ; siliques short, 

 linear, acuminate, on very short peduncles ; II. (j) Shores of Lake Cham- 

 plain, Vt. Plant about 8' high, slightly scabrous with very short hairs. Sili- 

 ques erect, terete, 4" in length, beaked with the short, slender style. Seeds 00. 



4. S. CANESCENS. Nutt. 



Lvs. bipinnately divided, canescent, lobes oblong or lanceolate, subden- 

 tate or obtuse ; pet. about equaling the calyx ; -siliques oblong-linear, shorter 

 than the pedicels. Arctic Sea to Flor. Plant 1 2f high, often nearly 

 smooth. Leaves about 3' long, sessile, segments 5 7 pairs, finely divided. 

 Fls. very small. Siliques often erect, on spreading pedicels. Variable. 



20. ERYSIMUM. 



GT. epvti), to cure ; from its salutary medicinal properties. 



Calyx closed ; siliques columnar, 4-sided ; stigma capitate ; seeds 

 in a single series ; cotyledons oblong, 0||. 



1. E. CHEIRANTHOlDES. 



Pubescence minute, appressed, branched; Ivs. lanceolate, denticulate or 

 entire; silique erect, spreading, twice longer than the pedicels; stig. small, 

 nearly sessile. By streams and in wet grounds, U. S. and Can., not com- 

 mon. Stem erect, 1 2f high, often branched, and, with the leaves, scabrous. 

 Leaves acute at each end, 1 2' long, | as wide. Flowers small, yellow, in 

 long racemes. Siliques i' to near 1' in length, linear, and somewhat spread- 

 ing. Jl. 



2. E. ARKANSANUM. Nutt. Yettaw Phlox. False Wall-Flower. 



Scabrous, with an appressed pubescence ; st. simple ; Ivs. linear-lanceo- 

 late, remotely dentate, sessile, lower ones runcinate-toothed ; inflorescence race- 

 mose, corymbed at summit ; siliques long, 4-angled, suberect ; stig. capitate. 

 @ A fine plant with large, showy flowers, resembling the wall-flower. Banks 

 of Scioto, Sullivant. Arkansas, Nuttall. Blufis of the Wabash ! Wood. 111. 

 Mead! Stem 1 3f high, slender. Leaves 2 3' by 3 G". Sepals straw-color. 

 Petals large, bright orange-yellow. Siliques 3' long. Jn. Jl. 



21. CHEIRANTHUS. 



Arabic Icheyry, the name of a certain plant, and Gr. av$o$ y flower. 



Calyx closed, 2 of the sepals gibbous at base ; petals dilated ; 

 silique terete or compressed ; stigma 2-lobed or capitate ; seeds flat, 

 in a single series, often margined, 0=. 



1. C. HESPERIDOIDES. T. & G. (Hespcris pinnatifida. Michx.} 

 Glabrous ; lower Ivs. lyrate-pinnatifid, upper lanceolate, attenuate at base, 

 unequally and sharply serrate-dentate, acuminate ; pedicels as long as the calyx ; 

 pet. obovate-spatulate, obtuse; silique terete; stig. capitate; sds. margined. 

 % Penn. to 111. ! S. to Ark. Stem slender, furrowed, 2 3f high. Leaves thin, 

 3- 5' long, | as wide, those of the stem scarcely petiolate. Racemes terminal 

 and axillary. Calyx shorter than the claws of the violet-colored petals. Siliques 

 torulose, 15 20" long} seeds oblong, plano-convex, with a narrow border. 

 May, Jn. 



