Ipomoea tuberculata [ker-gawl.]

Glabrous annual; stems slender, smooth or tuberculate, 1–2–4 m. long.. Leaf-blade round in outline, biternately or digitately 5–9-lobed, up to 12 cm. long and wide; lobes linear-lanceolate to elliptic, acute, 3–8 cm. long, 1–4 cm. wide; petiole 2–7 cm. long; pseudo-stipules present.. Peduncle 1–3-flowered, 2.5–7 cm. long; pedicels woody, clavate, up to 1 cm. long.. Sepals orbicular to elliptic-ovate, obtuse, smooth or verruculose, somewhat unequal, the outer 3 shorter and broader, 6–12 mm. long and 5–8 mm. wide, gibbous and 1–2-tuberculate at the base.. Corolla yellow or white with a purple centre, funnel-shaped with a narrow tube, 5–10 cm. long.. Capsule globose, 6–11 mm. in diameter.. Seeds subglobose-trigonous, 5 mm. in diameter, brown, with adpressed pubescence and sometimes with long hairs on the angles.