Compilation
Ipomoea tuberculata

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Name

Identification
Ipomoea tuberculata Ker-Gawl. [family CONVOLVULACEAE ] (stored under name); Verified by B. Verdcourt, Ipomoea odontosepala Baker [family CONVOLVULACEAE ]
Related name
  • Ipomoea odontosepala
  • Ipomoea calcarata
  • Ipomoea cairica
  • Ipomoea tuberculata
  • Convolvulus tuberculatus

Flora

Entry for Ipomoea tuberculata [family CONVOLVULACEAE]
Herbarium
South African National Biodiversity Institute, Compton Herbarium, Cape Town (SAM)
Collection
Flora of Southern Africa
Resource Type
Reference Sources
Entry From
Flora of South Africa, (2003) Author: Dr J.P. Roux
Names
Ipomoea tuberculata [family CONVOLVULACEAE]
Common names
I. dasysperma J.Jacq.: 132, t. 89 (Aug. 1816); A.Meeuse: 760 (1967a). Type: no specimen traced, Jacquin's plate can serve as iconotype. I.calcarata N.E.Br, in Baker & Rendle: 180 (1905-06). Type: Botswana, Ngamiland, Kwebe, Lugard 182 (K, lecto.).
Information
Glabrous annual herb. Stems climbing, up to 2 m long, smooth or tuberculate. Leaves broad­ly cordate-ovate in outline, up to 120 mm wide, biternately or digitately 5-9-lobed; lobes up to 80 mm long, linear to elliptic, apex acute to acuminate; petiole 20-60 mm long, often pseu-dostipulate. Peduncles 10-80 mm long, 1-3-flowered; bracteoles minute; pedicels 5-30 mm long, subclavate. Sepals oblong to elliptic, apex obtuse, smooth or verruculose, 8-10 mm long; outer ones sometimes shorter than inner ones, gibbous and 1- or 2-tuberculate at base. Corolla salver- to funnel-shaped, 30-60 mm long, tube pale mauve outside, darker mauve or bright magenta inside; limb up to 60 mm wide, bright yellow, paler outside; midpetaline areas dis­tinct, somewhat greenish. Capsule subglobose, glabrous, ±10 mm in diameter. Seeds subglo-bose-trigonous, ± 6 mm long, brown, with adpressed pubescence, often also with long cot­tony hairs on angles. Flowering time February to May.
Habitat
The above description refers to the var. tuber­culata, with a mostly 40-50 mm long corolla. The var. ondontosepala (Baker) Verde, with the corolla up to 100 mm long, occurs in Ethiopia, Tanzania and Zambia. The species is recognised by its biternately pedate 5-9-lobed leaves, its pseudostipules, its 8-10 mm long saccate outer sepals and yellow corolla with mauve tubes.
Use
42. Ipomoea tuberculata Ker Gawl. in Botanical Register 1: t. 86 (Feb. 1816); Verde: 123 (1963a); Roessler: 17 (1967a); Gone.: 102 (1987); Gone.: 108 (1992). Type: plant cultivat­ed in England from seed from Calcutta, no specimen traced; the plate in Botanical Register can serve as iconotype.
Range
From Somalia and Ethiopia through the drier parts of eastern Africa to northern Namibia and northern Botswana, extending to Sri Lanka and India; doubtfully reported from China. Grows in mixed scrub, woodland and in riverine forest. Map 66.

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