^4 TETRADYNAMIA. SILICULOSA. 



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

 silicle. 

 ,, 3. huperboreum. Hab. On the N. West Coast. 



An extensive genus of near 40 species, principally indi- 

 genous to the mountains of Europe, and the temperate 

 parts of Northern Africa and Asia. The southern hemis- 

 phere does not appear yet to have afforded a siTigle Alys- 

 sura, without we consider with Persoon Draba magellanica 

 as such. 



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

 Silicle reniform, compressed, and corrugated, 



cells valveless, 1-seeded. 



A genus in sensible properties and vegetation similar to 

 Lepidium. Leaves entire or pinnatifid. Stamina in C. 

 lUdyma 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. liuellii. 



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

 rope and America. C. didyma was also, I believe, ror 

 marked around Port Jackson in New Holland by Mr R, 

 Brown. Two other species are now added to the genus, 

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

 apparently very distinct from entire leaved specimens of 

 Lepidlipn virginiciim. 



454. LEPIDIUM. L. (Cress.) 



Silick 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. virginicim' Leaves linear-lanceolate, 



mostly all entire, but deeply serrate, flowers diandrous; 



silicle lentiform and emarginate, cells 1-seeded; stem 



' branched towards the summit. — Common every-where. 



Flowers minute. 



An extensive genus of near 40 species, indigenous to 

 Europe, Siberia, the Levaivti the Society islands, and the 

 Cape of Good Hope. 



455. THLASPI. L, (Shepherd's-purse.) 

 Silicle emarginate, obcordate, many seeded: 



valves navicular, with a carinate margin* 



