Herbs twining; axial parts glabrous, spreading pubescent, or almost woolly. Stems thinly angular, 1-2 m. Petiole 1.5-3.5 cm; leaf blade cordate-circular or ovate, occasionally reniform, 2-8 X 1.6-8 cm, glabrous or sparsely pilose, base cordate, margin entire or minutely undulate, apex attenuate, acute. Inflorescences 1-3-flowered; peduncle almost filiform, 1.4-4 cm; bracts subulate, ca. 1.5 mm. Pedicel 0.8-2 cm, subglabrous, thickened and recurved in fruit distally. Sepals reflexed in fruit, elliptic-ovate, subequal, 4-5 mm, glabrous or ± pubescent, mucronulate, outer ones whitish margined. Corolla white or pale yellow, with darker midpetaline bands and a purple center, funnelform, 2-2.5 cm. Stamens included; filaments very unequal. Pistil included; ovary glabrous. Stigma 2-lobed. Capsule conical-ovoid or ± globose, 6-8 mm in diam., apiculate. Seeds black-brown, 4-5 mm, densely gray-brown tomentellous. 2n = 30.
In typical specimens the corolla is 1·4-2·5 cm. long, whitish-yellow with or without a purplish centre.
Leaf-blade ovate (rarely linear-oblong), 2.7–9 cm. long, 0.4–7.5 cm. wide, acuminate or apiculate at the apex, cordate at the base, pubescent or glabrescent on both surfaces; petiole up to 8 cm. long.
Perennial herb; stems slender, prostrate or twining, up to 1.2 m. long, pilose or glabrescent.
Corolla yellow, orange, cream or white with purple, crimson or chocolate-brown centre, 1.4–2.3 (–2.5) cm. long.
Capsule globose, glabrous, 8–12 mm. in diameter, tipped with persistent style base.
Seeds ovoid, black, adpressed pubescent or velvety, up to 5.5 mm. long and 3.5 mm. wide (Fig. 24/1, p. 131.)
Sepals ovate, ovate-orbicular or ovate-lanceolate, 4–8 mm. long, 1.7–4 mm. wide, acute or apiculate, glabrous to pilose.
Inflorescences 1–several-flowered; peduncle 3.5–4 cm. long; pedicels 1–2 cm. long.
Sepals subequal, oavte, ovate-orbicular, ovate-lanceolate or lanceolate, 4–8 mm. long, acute or apiculate, glabrous to pilose, in fruit all somewhat accrescent, ultimately often spreading or reflexed.
Corolla funnel-shaped, yellow, orange, cream or white, concolorous or with purple centre, 1 ·5–2·5 cm. long, glabrous or the midpetaline areas thinly hairy towards the apices.
Capsule globose, tipped with persistent style base.
Seeds ovoid, black, appressed pubescent or velvety.
Perennial herb, with a taproot not thicker than a finger.
Stems several to many, slender, prostrate to twining, up to 3 m. long, pilose or glabrescent.
Leaf lamina ovate, rarely linear-oblong, 2·5–8·5 × 0·4–7 cm., acuminate or apiculate at the apex, cordate at the base, sometimes sagittate, entire or slightly undulate and often ciliate along the margin, pubescent or glabrescent on both surfaces; petiole up to 11 cm. long, pubescent or glabrescent as in the stems.
Inflorescences 1-several-flowered; peduncle slender, 1–8 cm. long, glabrous or shortly hairy; bracteoles minute, narrow, acute; pedicels 1–2 cm. long, sometimes minutely verrucose, shortly hairy or glabrous, at first erect but in fruit reflexed and thickened towards the apex.