Vines; stems trailing and rooting at the nodes, perennial, glabrous. Leaves variable in shape, often linear, lanceolate, ovate to oblong and the margins entire or undulate all on the same plant, 1.5-4(-8) cm long, the size varying greatly with habitat, basally obtuse, truncate to cordate, apically obtuse, emar- ginate or occasionally 2-lobed, glabrous. Flowers usually solitary in leaf axils; sepals oblong, the inner sepals 10-15 mm long, the outer sepals shorter, acute to obtuse, mucronulate, glabrous, subcoriaceous; corollas with the limb white, the throat apically yellow and basally purple, 3.5-5 cm long. Fruits capsular, globular, rarely ovoid, 10 mm in diameter; seeds light brown, short-tomentose and with longer comose trichomes on the margins.
Flowers pure white with a purple centre, 2 in. across the open limb.
Stems slender, glabrous, from a perennial tuberous root, creeping and sending up short leafy branchlets
Perennial glabrous herb from a stout tuberous root.
Stems trailing widely on the sands of seashore or running just beneath the surface, sending up short erect leaf branches, rooting at the nodes, glabrous.
Seeds short tomentose or with longer hairs along the edges.
Leaf lamina very variable in shape, thick, rather fleshy, often of various forms on the same plant, linear, lanceolate, ovate or oblong, entire or 3–5-lobed, 1·5–5 × 1–3 cm., obtuse, truncate or cordate at the base, obtuse or emarginate to 2-lobed at the apex; petiole 0·4–4 cm. long.
Inflorescences 1–3 flowered; peduncle 10–15 mm. long; pedicels 8–15 mm. long, accrescent in fruit; bracts minute, linear, 2–3 mm. long.
Sepals unequal, inner ones 10–15 mm. long, outer ones shorter, all oblong, acute or obtuse, mucronulate, glabrous, subcoriaceous.