368 ROCK GARDENS 



Viola (Violaceae), Pansy Violet 



This genus has given us some of the most beautiful flowers that 

 deck the hedgerows at home, or the alpine slopes abroad. The 

 garden Pansy is but a hybrid Viola, and the well-known garden 

 Viola, so near akin to the Pansy, is but a cross between the 

 Pansy and other Violas. Of this large genus the following is a 

 selection : — 



V. bijiora (Two-flowered Yellow Violet). — Half-shady position in 

 moist loam. Flowers yellow, and generally two borne on each 

 stalk. Increased by division. Flowers in May and June. 



V. calcarata (Spurred Violet). — Half-shady position in loam. 

 Flowers purple or white, borne in great profusion. A variable 

 species. Propagated by seed and division. 



V. cornuta (Homed Pansy). — Half-shady position in moist loam. 

 Pale blue or mauve- coloured flowers. Seed, cuttings, or division. 



V. gracilis. — Of the Wild Pansy type. Open position in light 

 soil. Deep purple flowers in great abundance in spring. A very 

 pretty species. 



V. hirta. — Of the Violet type. Forms compact tufts, with blue, 

 white, or reddish-purple flowers. Grows anywhere, even on hot, 

 dry banks. 



V. odorata (Sweet Violet). — Same as above, except that the 

 flowers are sweet - scented. The parent of the well - known 

 garden Violets. 



V. pedata. — Of the Violet type. Half shade in good, well-drained 

 light soil. Dwarf and compact habit. Leaves deeply divided. 

 Flowers bright blue, but very variable. One of the most beautiful, 

 and, at the same time, hardest to cultivate of the genus. Pro- 

 pagated by seed and division. 



V. tjicolor (Heart's-ease). — This is the species from which all the 

 garden Pansies are supposed to have descended. Some of the 

 choicer varieties may be included in the rock garden. 



Besides the species just described, the following are worthy of 

 cultivation : — V. cenisia, V. canadensis^ V. lutea^ V. pinnata, V. 

 heterophylla, V. sorora^ V. sUiata. 



VlTTADENIA TRILOBA {see ErIGERON MuCRONATUS) 



Wahlenbergia {see Edrianthus) 



Waldsteinia (Rosaceae) 



Pretty plants nearly allied to the Strawberry. 

 W. fragarioides. — Trailing habit, with bright red stems and large 

 bright yellow flowers. Of easiest culture in ordinary soil. 



