Ipomoea obscura var. obscura (L.) Ker Gawl.

Perennial herb with taproot 500 mm or longer. Stems few-to many, mostly unbranched, glabrous to hairy, up to ±3 m long, usually prostrate, becoming woody below. Leaves usually secund, oblong-cordate to broadly cordate, 30-90 x 20-75 mm, basal sinus deep, basal lobesrounded, apex acuminate or apiculate, margin entire to somewhat undulate, often ciliate, usually thinly strigose on both surfaces, green above and paler beneath; petiole hairy, 15-80 mm long. Inflorescence cymosely 1-to few-flowered; peduncle 30-80 mm long; bracts minute; pedicels 10-20 mm, minutely verrucose, shortly hairy or glabrous, reflexed and thickened in fruit. Sepals subequal, 4-8 mm long, pubescent or glabrous, broadly ovate to ovate-lanceolate, ultimately accrescent and often reflexed. Corolla funnel-shaped, pale yellow or white, with or without purple, red or brown centre, 15-25 mm long, limb as much wide, glabrous; midpetaline areas well defined, sometimes thinly hairy outside. Capsule ovoid to subglobose, glabrous, 7-12 mm in diameter, pale brown, style base persistent. Seeds ovoid, greyish tomentose, 4.5-5.5 mm long. Flowering time throughout the year, mostly September to April.