This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol3", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Shrubs, trees, vines, or perennial herbs, with opposite simple or pinnate leaves, and perfect, regular or irregular, mostly cymose flowers. Stipules none, or sometimes present. Calyx-tube adnate to the ovary, its limb 3-5-toothed or 3-5-lobed. Corolla gamopetalous, rotate, campanulate, funnelform, urn-shaped, or tubular, the tube often gibbous at the base, the limb 5-lobed, sometimes 2-lipped. Stamens 5 (very rarely 4), inserted on the tube of the corolla and alternate with its lobes; anthers oblong or linear, versatile. Ovary inferior, 1-6-celled; style slender; stigma capitate, or 2-5-lobed, the lobes stigmatic at the summit; ovules anatropous, 1 or several in each cavity. Fruit a 1-6-celled berry, drupe, or capsule. Seeds oblong, globose, or angular; seed-coat membranous or crustaceous, smooth or can-cellate; embryo usually small, placed near the hilum; radicle terete; cotyledons ovate.
About 10 genera and 300 species, mostly natives of the northern hemisphere, a few in South America and Australia.
Corolla rotate or urn-shaped; flowers in compound cymes; styles deeply 2-5-lobed; shrubs or trees. Leaves pinnate; drupe 3-5-seeded.
Leaves simple; drupe 1-seeded.
Corolla tubular or campanulate, often 2-lipped; style slender. Erect perennial herbs: leaves connate.
Creeping, somewhat woody herb; flowers long-peduncled, geminate.
Shrubs or vines.
Fruit a few-seeded berry.
Corolla short, campanulate, regular, or nearly so.
Corolla more or less irregular, tubular or campanulate.
Fruit a 2-celled capsule; corolla funnelform.