Annual or perennial herbs with erect, prostrate or twining stems. Leaves variable, entire or lobed. Flowers axillary in 1-flowered cymes, sometimes subumbellate. Sepals 5, equal or subequal. Corolla funnel-shaped, white, pink or pinkish-purple, shallowly 5-lobed. Stamens 5, included. Ovary 2-locular. Style 1, simple, filiform; stigmas 2, linear, about the same thickness as the styles, filiform. Capsule usually 4-valved. Seeds usually 4, black or brown, usually glabrous. Worldwide: c.250 species, mostly in temperate and subtropical regions; rare in the tropics Burundi: 2 taxa. Insects associated with this genus:
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| Species | Content | |
| arvensis L. | ||
| aschersonii Engl. |