Vespers (page 44): "I remember the sunlight of early spring, embankments / netted with dark vinca."
Other names: Periwinkle
Family: Apocynaceae
Type: Herbaceous or woody (subshrub) evergreen perennial
Blooming period: Spring to early Fall
Sun requirement: Partial shade, shade
Soil requirement: Any
Notes: Can be used as a groundcover in full shade, but will flower more with sun.