This section is from the book "Handbook Of Hardy Trees, Shrubs, And Herbaceous Plants", by W. Botting Hemsley. Also available from Amazon: Handbook of hardy trees, shrubs, and herbaceous plants.
Herbs, rarely frutescent; juice milky. Leaves alternate, exsti-pulate. Calyx-limb 5-cleft. Corolla epigynous, regular or irregular. Stamens 5, epigynous or epi-petalous; anthers free or combined. Ovary 2- or more celled, inferior or half superior; stigma surrounded by hairs or naked. Fruit a berry or capsule, dehiscing in pores or valves above or below the calyx-limb, many-seeded. Seeds minute, often pitted, albuminous. There are upwards of 50 genera and 800 species included in this order. The Cam-panulacece proper are mostly found in temperate countries of the North, and the Lobeliaceae in tropical or sub-tropical regions.