Zantedeschia jucunda is most nearly related to Z. pentlandii and Z. albomaculata. It differs from the former in having triangular-hastate, copiously spotted leaves with upwardly spreading basal lobes and an acute apex, while the spathe is more cup-shaped, a deeper yellow without and within, where it is also slightly rugose, and the limb more spreading and tapering to a subulate tip; whereas Z. pentlandii has immaculate (or rarely maculate), oblong- lanceolate leaves with short rounded basal lobes, the spathe regularly funnel-shaped, limb erect, lighter in colour, greenish outside, terminating abruptly in a subulate tip. From the form of Z. albomaculata subsp. albomaculata occurring in the eastern Transvaal, Z. jucunda differs in its consistently brilliant yellow spathes, whereas the spathes of Z. albomaculata may be white, cream or pale-yellow with an occasional coral-pink variation.
Perennial herb, up to 0.6 m high. Leaves triangular-hastate, 170-300 x 50-150 mm, densely maculate with long, white, translucent spots. Spathe golden yellow.
Plants glabrous, up to 60 cm tall. Leaves deciduous, petiolate, up to 60 cm long; petioles 10-30 cm long; blade triangular-hastate 17-30 cm long. 5-15 cm broad across the base, densely maculate with long white translucent spots, semi-folded along the midrib and upwardly spreading, apex acute with a subulate tip, the length of the blade above the basal lobes usually less than twice the width. Spathe about 10-16 cm long, golden-yellow with a purple blotch at the base inside, very slightly rugose within, deep yellow without, folded from below the insertion of the spadix into a cup-shaped funnel; limb spreading, slightly recurved backwards and tapering to a subulate tip. Spadix 3-4 cm long; male zone apical about 2-2.5 cm long; female zone basal more or less 2.5 cm long; ovaries subglobose, angled from pressure, sessile, about 24 in number. Fruits about 1-3 cm in diam., 3-loculed with 5-8 ovules.