PRINCIPAL SPECIES OF VIOLA 107 



V. rotundifolia. At flowering time the leaves of this 

 North American plant are small, but later they develop 

 to a large size, 4 inches in diameter. It is found in 

 shady rocky situations, and bears good-sized pale-blue 

 flowers. 



V. sagittata. Found on hillsides and fields in North 

 America. It has hastate leaves and bright-blue flowers. 



V. Sarmentosa. A creeping species, with stolons and 

 cordate leaves. The flowers are yellow. 



V. striata. A strong-growing, attractive plant, often 

 12 inches high. The flowers are cream-coloured, the lower 

 petals being veined with purple. It grows in wet meadows 

 in mountainous districts in North America. 



V. suavis. The Russian Violet is closely allied to our 

 native Sweet Violet, but is distinguished by its pale- 

 green leaves and larger, paler flowers. It was introduced 

 from the Caucasus in 1820. 



V. sylvestris (Wood Violet). A well-known native 

 plant with bluish-purple and lilac-coloured flowers, pro- 

 duced on axillary branches from a radical rosette. It is 

 also known as V. sylvatica. There are several forms of 

 this species, such as the varieties Reichenbackiana and 

 Riviniana. 



V. tricolor. (Heartsease ; Pansy). A common very 

 variable annual, found in cultivated fields. The flowers 

 vary from small yellow blooms to large tricolored ones, blue, 



