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Herbs or shrubs, often twining, sometimes prostrate. Leaves usually petiolate, rarely sessile, margin entire, dentate, or palmately or pedately lobed or compound. Flowers axillary, solitary or in few-to many-flowered, variously branched cymose inflorescences; bracts usually small. Sepals variable in shape, often convex, subequal or outer 2 smaller, persistent, often enlarged in fruit. Corolla often yellow or white, sometimes with a darker center, funnelform or campanulate, usually glabrous, or midpetaline bands ± sericeous, sometimes only at apex; limb entire or ± 5-angled. Stamens included, often unequal; anthers often spirally twisted; filaments dilated basally, filiform distally; pollen 3-12-colpate or polyrugate, not spiny. Disc ringlike. Pistil included; ovary (imperfectly 2-)4-loculed, 4-ovuled. Style 1, filiform; stigmas 2-globular. Capsule 1-4-loculed, usually 4-valved or ± irregularly dehiscing. Seeds 4 or fewer, glabrous or pubescent to villous especially at margin.
Vines or lianas; usually herbaceous, some lignescent, small or large. Leaves entire, lobed, or palmately compound with 3-7 leaflets, glabrous or pubescent. Flowers solitary and axillary, in few-flowered dichasia or sub-umbellate, the bracts linear or lanceolate; sepals subequal, oblong to elliptical; corolla cam-panulate, large or small, white, yellow or purple; the filaments equal or subequal, mostly glabrous at the base, the anthers spirally twisted with complete de-hiscence, the pollen 3-colpate or rarely pantocolpate; ovary usually glabrous, 2-3 carpellate, 4-6 ovulate, the style filiform, the stigma globose or biglobose, included. Fruits capsular, 2-4-celled, longitudinally dehiscent by 4-6 valves or irregularly, the pericarp thin and fragile; the seeds 4-6, glabrous or pubescent.
Herbs or shrubs, usually twiners but often prostrate, rarely erect. Flowers solitary or in few-to many-flowered axillary inflorescences, small to rather large. Sepals usually subequal, save in a very few species, elliptic to orbicular, obtuse or acute, sometimes accrescent. Corolla funnel-shaped or campanulate, entire or slightly lobed, rarely deeply lobed, white or usually yellow* with various centres. Stamens included; pollen smooth. Ovary 2–4-locular, 4-ovuled; style simple, filiform; stigma biglobular. Capsule 4-valved or dehiscing irregularly, 1–4-locular. Only the following species of Ipomoea have yellow flowers :— I. tuberculata, alpina, obscura, and ochracea.
Corolla funnel-shaped or campanulate, entire or slightly lobed, rarely deeply lobed, mostly with distinct midpetaline areas, white or yellow with various centres, often darker brownish or purplish centre.
Leaves usually petiolate, variable in shape and size, entire, dentate, auricled, lobed or palmately or pedately partite to compound.
Flowers axillary, solitary or in few-to many-flowered axillary inflorescences, small to rather large, usually cymose.
Sepals 5, usually subequal, elliptic to lanceolate, ovate or oblong, acute or obtuse, sometimes accrescent.
Stamens often contorted; filaments filiform, often broadened at the base, often unequal; pollen smooth.
Ovary 2–4-locular, 4-ovuled; style simple, filifrom, included; stigma biglobose.
Herbs or small shrubs, usually twiners, often prostrate, rarely erect.
Capsule 4-valved or dehiscing irregularly, 1–4-locular.
Seeds 4, or less by abortion, glabrous or pubescent.
Stems terete, more rarely winged.
Bracts usually small.
Disk often annular.
