Hardy Exotic Plants for Naturalization. 59 



slopes, and margins of shrabberies are the numerous kinds 

 of Helianthemums. . They flourish to greatest perfection 

 in chalky or warm soils. 



THE VIOLET FAMILY. 



Two-flowered Violet. Viola Hflora. Europe. Her- 

 baceous perennial ; 3 to 6 inches ; yellow ; spring and 

 early summer ; seed or division. — In moist, rocky, or 

 stony places, between the stones ia rockworks, etc. 



Horned Violet. Viola cornuta. Pyrenees. Herba- 

 ceous perennial j 3 to 6 inches ; blue ; summer ; seed, 

 division, or cuttings. — Rocks, banks, fringes of low shrub- 

 beries, or indeed in almost any position where it may not 

 be overrun by coarse plants. 



Canadian Violet. Viola canadensis. North America. 

 Herbaceous perennial ; 4 to 6 inches ; white, streaked 

 with violet ; summer ; seed or division. — A vigorous kind, 

 good for running beneath fringes of shrubberies and 

 woods. 



THE SUNDEW FAMILY. 



American Grass of Parnassus. Parnassia asarifolia. 

 North America. Herbaceous perennial ; 3 to 6 inches ; 

 white ; summer ; seed or division. — Would be well worth 

 naturalizing in such moist, boggy spots as our own Grass 

 of Parnassus delights in. 



THE MILKWORT FAMILY. 



Bastard-Box. Polygala Chamabuxus. Austria. 

 Evergreen trailer ; 3 to 6 inches ; yellowish ; early sum- 

 mer ; division.— Bare rocky places, in a somewhat moist 



