S32 Oedeb 13.— CURCIPER^ 



Siliqueg when mature 1^ — 2' long, 1" wide, tipped with a short style. Cotyledona 

 obUqueJy 0= or nearly 0|. Apr., May. 

 |8. A variety (A. petE/EA Lam. 7) has very slender, upright stems, smooth, a 

 few siii!»U, incised root-lvs., few linear stem-lvs. and cotyledons wholly 0=. — 

 Shores of the great lakes (Ohio), Can. 



3 A. Thaliana L. Mouse-ear Cress. Sts. branched at base, erect; Ivs. pilous, 

 oblong, nearly entire ; petals twice longei- than calyx; pods erect, squarish. — '^J Eocks 

 and sandy fields, Tt. to 111. and Car. Whole plant pubescent with stellate-hairs. 

 St. several from the same root, erect, simple, slender, 4 — 12' high. Boot-lvs. 

 rosulate, petiolato, 1 — 2' long, cauline appressed, an inch long, base somewhat 

 clasping. Fls. small, white. Pods 6 — 8" long. Cotyledons obliquely 0|. May. 

 § Eur. (Sisymbrium, Gay.) 



4 A. dentata Torr. & Gr. Sts. branched at' base, diffuse; Ivs. roughiah-downy, 

 obloug, sharply iootlied; petals hardly longer than calyx; pods spreading. — ® 

 River banks, N. Y. to Mo. Plant scabrous with stellate hairs. Sis. decumbent, 

 a foot high. Eoot-Ivs. 2' long by f ; cauline half-clasping with an auriculate 

 base, all very obtuse and ii-regularly toothed. Fls. small, whitish. Pods very 

 Blender, 1' long. May. 



5 A. pitens Sullivant. Erect, pubescent; cauline Ira. coarsely toothed ; siliques 

 spreading and curved upwards, ieaked with a distinct style. — Rooky banks of tbo 

 Scioto, O. (SulUvant), and southward. Sts. J. — 2f liigh. Root-lvs. rosulate, petio- 

 late; stem-lvs. oblong-ovate or linfaar, auriculate-clasping. Fls. rather large (5 — 6" 

 broad), white. Pods nearly 2' long. May. 



6 A. hirsCita Scop. Erect, hirsute ; radical Ivs. oblong-ovate, tapering to a pe- 

 tiole, cauline oval or lanceolate, sagittate-clasping, entire or toothed ; siliques 

 straight, erect ; sty. none. — @ Found in low, rocky grounds. Can. to Va., W. to 

 Oregon. Sts. 2 or more from the samo root, round, hairy at base, near a foot 

 high, slender and parallel. Lvs. scarcely dentate, sessile, with heart-shaped or 

 arrow-shaped bases, the upper acute. Fls. greenish-white. Siliques 1 — 2' long. Ju. 



7 A. laevigata DC. Tall, glaucous, smooth; stem-lvs. linear-lanceolate, and 

 linear, sagittate-clasping, the upper entire ; siliques very long, linear, at length 

 sprua ling and pendulous. — % In rocky woods and low grounds, Can. to Tenn. 

 and westward. St. 2f high, round, simple, or branched above. Root-lvs. often 

 purplish, obovato and oblong, petiolate, f — IJ' long, .} as wide, with acute teeth. 

 Stem-lvs. 3 — 5' long and very narrow. Fb. erect, greenish, tlio petals hardly 

 longer than the calyx. Siliques 3' long, scarcely 1" wide. May. 



8 A. Canadensis L. Sickle Pod. Tall, pubescent ; stem lvs. lanceolate, pointed 

 both ways, sessile ; silique subfalcate, veined, pendulous. — % On rocky hills Can. 

 to Ga,, W. to Ark. A plant remarkable for its long, drooping pods which resem- 

 ble a sickle-blade, or rather a scythe. St. 2 — 3f high, slender, round, smooth. 

 Lvs. 3 — 5' long, J as wide, the lowest early marescent, middle and upper ones 

 sessile or clasping, with naiTow bases, remotely denticulate. Fls. small, the nar- 

 row, white petals twice longer than the calyx. Pods slender, flattened, 3' long. 

 May, Jn- 



8. CHEIRANTHUS, L. Wall Flower. (Arabic kheyry, tlio name 

 of a certain plant, and Gr. oi'^of, flower.) Calyx closed, 2 of the sepals 

 gibbous at base ; petals dilated ; silique terete or compressed ; stigma 

 3-lobed or capitate ; seeds flat, in a single series, often margined. (0=). 

 Garden perennials, mostly European. Lvs. undivided. 



C. Cheiri L. St. somewhat shrubby and decumbent at base ; lvs. entire or 

 slightly dentate, hinceolate, acute, smooth ; branches angular ; petals obovate ; 

 siliques erect, acuminate. — % From S. Europe. A popular garden flower, ad- 

 mired for its agreeable fragrance, and handsome corymbous clusters of orange 

 or yellow flowers. Plant about 2f high. Jn.f 



9. LEAVENW6RTHIA, Torr. (Named for Br. Leavenworth, the 

 discoverer.) Calyx rather erect ; petals cuncatc, rotuse or truncate ; 



