CHEiRANTiRy. Xiil. (JliaClFERiE. 169 



ment largest. Upper leaves in 3 lanceolaie 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 oiics numerous and petiolate, oblong, 



cauline ones lanceolate ; cal. much shorter than the pedicels ; siliqucs ascending, 

 twice longer than the pedicels. — (i) Rocks and sandy fields, Vt. to Ga. W. to 

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

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

 ses.sile, 6 — 12" by 1 — 3". Pedicels spreading, 3—5" long. Flowers small, 

 white. Siliques slender, straight, 7 — 10" long. Styles scarcely any. May. 



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



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

 linear, acuminate, on very short peduncles ; II. — Shores of Lake Cham- 

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

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



4. S. CANESCENS. Nutt. 



L/vs. bipinnately divided, canescent, lobes oblong or lanceolate, subden- 

 tate or obtu.se; 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. 



Gr. epvci}, to cure ; from its salutary medicmaJ properties. 



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

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



1. E. CHEIRANTHOiDES. 



Pvhescence minute, appressed, branched ; lvs. 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 \' to near 1' in length, linear, and somewhat spread- 

 ing. Jl. 



2. E. Arkansanum. Nutt. Yellow Phlox. False Wall-Flovxr. 



Scabrous, with an appressed pubescence ; 5/. simple ; lvs. linear-lanceo- 

 late, remotely dentate, sessile, lower ones runcinate-toothcd ; injlarcsccnce race- 

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

 (g) A fine plant with large, showy flowers, resembling the wall-flower. Banks 

 of Scioto, SuUivant. Arkansas, Nuttall. Blufl^s of the Wabash ! Wood. 111. 

 Mead! Stem 1 — 3f high, slender. Leaves 2 — 3' by 3 — 6". Sepals straw-color. 

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



21. CHEIRANTHUS. 



Arabic khcyry, the name of a certain plant, and Gr. aj/Soj, 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 scries, often margined, 0=. 



1. C. nESPRRiDolDKS. T. &G. (Hesperis pinnatifida. Michx.) 

 Glabrous; hnrrr Irs. lyrate-pinnatifid, jz/y^c/- lanceolate, attenuate at liasc, 

 unequally and sharply serrate-dentate, acuminate; pedicels i\s long asthecalvx; 

 pel. obovate-spatulatc, obtuse; .silique terete; .slig. capitate; sds. margined. — 

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

 3—5' long, \ as wide, Iho.sc of the stem scarcely petiolate. Kacemes terminal 

 and axillary. Calyx shorter than the clawsof the vicdet-eolored petals. Siiiiiiies 

 torulose, 15 — 20" long; seeds oblong, plano-convex, with a narmw I-t'I-i 

 Mav, Jn. 



