108 Holm Additions to the Flora of Washington. 



*49a. Nasturtium palustre DC. var. hispidum Fisch. & Mcy. 

 Flats of the Potomac below Chain Bridge-. G. B. Slid worth. 



* 50a. Nasturtium sessiliflorum Nutt. 



Flats below Chain Bridge, May 29, 1890. G. B. Sudworth. 



55. Arabia dentata Torr. & Gray. 



Common on the Potomac shore just above Aqueduct Bridge, 

 Virginia. The author. 



70. Sisymbrium Alliaria Scop. 

 High Island. Miss Bebb. 



72. Camelina sativa Crantz. 



Several specimens were observed along the Chesapeake and 

 Ohio Canal, east of High Island, in the third week of May. G. 

 B. Sudworth. 



74. Brassica nigra Koch. 



Upon the rocks on the Virginia shore at Chain Bridge;. The 

 author. 



78. Thlaspi arvense L. 



Below the Insane Asylum. Lester F. Ward. 



CIST ACE M. 

 80. Helianthemum Canadense Michx. 



Mount Hamilton. E. S. Burgess. Opposite Oak Hill Ceme- 

 tery and at Bcnnings. G. W. Oliver. 



VIOL A OEM 

 *89f>. Viola canina L., var. Muhlenbergii Gray. 



Fourteenth street road and Rock Creek. June, 1889. G. W 

 Oliver. 



* 89c. Viola odorata L. 



Near Accotink, Fairfax County, Virginia. William Hunter. 



POLYGALACE.E. 

 96. Polygala incarnata L. 



Terra Cotta swamp and along the Queens Chapel road. Les- 

 ter F. Ward and the author. 



