11 



Thlaspi. 

 Thlaspi arvense Penny cress. 



Lepidium. — Pepperwort. 



Lepidium intermedium Wild pepper grass. 



Lepidium campestre Pepperwort pepper grass. 



Cakile. 



Cakile Americana American sea rocket. 



Raphanus. 

 Raphanus sations Garden radish. 



Order 11. CAPPARIDACE^.— Caper Family. 



POLANISIA. 



Polanisia graveolens Polanisia. 



Order 13. CISTACEiE.— Rock Rose Family. 

 Helianthemum Canadense Frost weed. 



Order 14. VIOLACEiE.—Violet Family. 



Viola . — Heart's- ease. 



Viola rotundifolia Round-leaved violet. 



Viola lanceolata Lance-leaved violet. 



Viola blanda Sweet white violet. 



Viola odorata Sweet or English violet. 



Viola palustris Marsh violet. 



Viola palmata var cucullata Common blue violet. 



Viola canina var sylvestris Dog violet. 



Viola rostrata Long-spurred violet. 



Viola Canadensis Canada violet. 



Viola pubescens Downy yellow violet. 



Viola eriocephalus 



Viola tricolor Pansy or heartsease. 



0. 



SOLEA. 



Solea concolor Green violet. 



