Cheiranthls. Xlli. (JKUCIFEll^E. 169 



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

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

 environed by the appre.ssed, sessile pods. Jn. — Sept. Medicinal. ^ 



2. S. Th.vliana. Gay. (Arabis. Linn.) Tliallan Hedge Mustard. 



Lis. subdenlate and \>\\oii<^, radical ones numerous and pctiolate, oblong, 

 cauline ones lanceolate ; cai. much shorter than the pedicels ; siliqiics ascending, 

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

 Ky. Stem -1 — 12' high, erect, with slender, erect branches, striate, pilose, olten 



3. S. TERES. T. & G. (Cardamine. Mich.i:) 



St. erect, branched; Ivs. all somewhat lyrately linuatifid; siliqties short, 

 linear, acuminate, on very short peduncles ; "O II. — (X) 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- 

 late or obtuse; pet. about equaling the calyx; siliqnes oblong-linear, shorter 

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

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

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



20. ERYSIMUM. 



Gr. epvai, to cure ; from its salutary medicinal properties. 



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

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



1. E. CHEIRANTHOiDES. 



Pubescence minute, appressed, branched ; Irs. 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- Flanker. 



Scabrous, with an appressed pubescence ; st. simple ; lvs. 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, Nnttall. Bluffs 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 kheyry, 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 series, often margined, 0=. 



1. C. HESPERiDoiDEs. T. & G. (Hesperis piunatifida. Alich.v.) 

 Glabrous; loicer lvs. lyrate-pinnatifid, «7>/^e/- 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. 



