140 



tETRADYNAHIA SlLlCULOSA, 



lo porrecto; corymbis I style prominent; co- 

 paucifloris. | rymb few flowered. 



Pursh 2. p. 435. Niitt. 2. p. 64. 



This plant which I have inserted from Pursh and Nuttall has escaped 

 my observation. It is said to grow in pastures intermingling with the C. 

 Didyma^ and to be a larger species. 



EN. 



L. 1077. 



LEPIDIUM. G 



i 



Silicida emargina- j Pod emarginate, 

 ta, cordata, polysper- | cordate, many seeded. 



Valves keeled, with a 

 transverse partition. 



ma. 



Valvulis cari 

 natis dissepiment© 

 contrariis. 



1. V 



IRGINICUM 



Li. foliis radicali- 

 bus pinnatifidis, cauli- 

 nis lineari lanceolatis, 



subinciso 



serratis 



floribus 4-petalis, di- 

 andris ; siliculis lenti- 

 formibus. 



Radical leaves pin- 

 natifid, those of the 

 stem linear lanceolate, 



deeply serrate ; flow- 

 ers 4-petalled. dian- 



drous 5 pod lens sha- 

 ped. 



Sp. pi. 3. p. 410. 



Walter 175. 



Mich. 2. p. 27. Pursh 2. p. 435. Nutt. 2. p. G4. 



Root perennial. Stem herbaceous, 12 — 15 inches high, glabrous. 

 Leaves alternate, sessile, finely ciliate, more or less deeply notched, the 

 tipper ones diminishing in size, and nearly entire. Floioers in terminal 

 racemes. Calyx 4-cleft, leaflets lanceolate, appressed, membranaceous 

 along tlie margin, pubescent on the back, deciduous. Petals 4, white, ob- 

 ovate, a little longer than the calyx. Glands 4, very small, at the base 

 of tlie germ. Filaments 2, sometimes 3, as long as the calyx. Anthers 

 incumbent. Germ orbicular, compressed. Style 0. Stigma globose. 

 Fod orbicular, compressed, slightly emarginate, 2 celled. Seeds 1 "* 

 each cell. 



Grows in pastures and about buildings. Very common. 



Flowers April — May. 



