April (page 20): "as ... white / [marks] the wood violet."
Other names: Pansy, viola
Family: Violaceae
Type: Mostly herbaceous annuals and perennials, a few shrubs
Blooming period: late Spring to Summer
Sun requirement: Sun or partial shade.
Soil requirement: Typically moist, but well-drained
Notes: There are many different varieties, with different flowers and blooming periods.
Sources: [1]