TETRADYNAMIA. SILiqUOSA, 69 



462. CHEIRANTHUS. L, (Wall-flovver. Stock.) 



Calix closed; 2 of the leaves gibbous at the 

 base. Pcffl/s (iilatrd. Disk of the germ biglan- 

 diilous. Siliquc cumpressed or terete. Stigma 

 bilobed. Seeds fiat, sometimes marginated. 



Herbaceous or sufFniticose; leaves more or less pubes- 

 cent, entire or pinnatifid; flowers yellow or purple, large, 

 and Oiten odorous. A genus very nearly allied to Hespe- 

 ris and to the entire leaved species o{ Erysiimim, exclud- 

 ing E. AUiaria. 



Species. 1. C. Pallasii. Ph. —North West Coast. 2. 

 * asper. Stem simple, and acutely angular; leaves canes* 

 cently pilose, sublinear, entire, margin acculeately and re- 

 trorsely asperate, radical fasciculated attenuated-sublan- 

 ceolate, acute, retrorsely toothed; siliqiie very long quad- 

 rangular and divaricate; claws of the petals longer, than 

 the_ calix. Cheiranthus evysimoides Ph. Hab. On the 

 plains of the .Missouri, commencing near the confluence 

 of White river. Fl. June. Obs. Biennial. Stem 12 to 

 18 inches high, mostly simple, but now and then branch- 

 ing towards the summit. Leaves every where covered 

 with white, short, retrorse, strigose and appressed hairs; 

 margin aculeolate, stem leaves crowded, 2 or 3 lin^ 

 wide and 2 inches long. Flowers very similar to those 

 of C. Chem, and almost equally odorous. Calix oblong, 

 2 of tlie leaves distinctly gibbous at the base. Petals di- 

 lated, claws long, limb broad obovate, bright yellow. 

 Stigma bilobed. Silique 2 or 3 inches long, spreading, 

 4-sided, 2 of the angles asperate. 



A genus of about 40 species, indigenous to Europe and 

 the temperate and colder parts of Asia and Africa in both 

 hemi.>,pheres. 



463. HESPERIS. X. (Rocket.) 



Calix closed, shorter than the claws of the 

 petals. Petals for the most part obliquely bent, 

 Jijiear or obovate. Sllique subterete. Lobes of 

 the stigma connivent. Seeds immarginate. 



Nearly allied to the preceding genus, having also 2 of 

 the calix leaves gibbous at the br.se, and a gland at the 

 inner base of the 2 shorier stamina. Stigma in some spe- 

 cies sagittate at the base. 



Species. 1. H. phinatijlja. Leaves ovate-lanceolatCa 

 sharply toothed, nearly smooth, lower and radical subpin- 



