This section is from the book "Harper's Guide To Wild Flowers", by Caroline A. Creevey. Also available from Amazon: Harper's Guide To Wild Flowers.
Vinca. minor - Family, Dogbane. Color, blue. Parts of the flower in fives. Calyx and corolla, tubular; limb of the corolla, salver-form. Stamens, joined to the corolla. Smooth, prostrate plants, represented in the tropics by shrubs or trees, generally poisonous plants. Leaves, opposite, thick, shining, evergreen. Flowers, single, in the axils, peduncled. February to May.
Escaped from cultivation, found now in corners of neglected gardens, along roadsides, etc.
 
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