€4 TETRADYNAMIA. SILICULOSA. 



led, many-seeded, style terete, about the length of the 

 ^tt^ silicle. 



3. hyperboreiim. Hab. On the N. West Coast. 



An extensive g-enus of near 40 species, principally indi- 

 genous to the mountains of Europe, and the temperate 

 parts of Nortlitrn Africa and Asia. The southern hemis- 

 phere does not appear yei to have afforded a single Alys- 

 suni, without we consider with Persoon Draba magellairica 

 as such. 



455. CORONOPUS. Gcertner. (Wart-Cress.) 

 Silicic reniform, compressed, and corrugatedj 

 cells valveless, 1-seeded. 



A genus in sensible properties and vegetation similar to 

 Lepidium. Leaves entire or pinnatifid. Stamina in C, 

 didyma 2 or 4, Corymb lateral or terminal. 



Species. 1. C. didyma. Abundant along the margins 

 of the Mississippi and Missouri, common also in Carolina 

 ■with the following. 2. Huellu. 



A genus of 4 species, 2 indigenous in common to Eu- 

 rope and America. C. didyma was also, I believe, re- 

 marked around Port Jackson in New Holland by Mr. R. 

 Brown. 'I' wo other spec",^ are now added to the genus, 

 1 from Madagascar, the stCbndfrem Monte -video, and not 

 apparently very distinct from entire leaved specimens of 

 JLepidium vir^inicum. 



454. LEPIDIUM. L. (Cress.) 



Sltidc emarginate, elliptic, cells 1-seeded, 

 valves carinate, dissepiment contrary. 



Leaves often pinnatifid or deeply serrated, many of 

 the stamina and in some species the petals defective. 



Species. 1. L. virginiaim- Leaves linear-lanceolate, 

 mostly all entire, but dcepl\ sciTate, flowers diandrous; 

 silicle lentiform and emarginate, cells 1-seeded; stem 

 branched towards the summit. — Common everj-where. 

 Flowers minute. 



An extensive genus of near 40 species, indigenous to 

 Europe, Siberia, the Levant, the Society islands, and the 

 Cape of Good Hope. 



455. THLASPI. L. (ShepherdVpurse.) 

 Silicle emarginate, obcordate, many seeded; 



valves navicular J with a carinate margin. 



