Polynesian Ivy leaves are characterized by their wavy or toothed edges and an elliptic to oblong shape, sometimes broadly egg-shaped. Measuring 1 to 4 inches (2.5 to 10 cm) by 0.8 to 2 inches (2 to 5 cm), they feature a variable gray-green color with dark green margins and light green to silver patches. The underside shows purplish margins and sometimes pink tinges. The upper surface reveals a mosaic-like vein pattern, while the lower surface veins are reddish or brownish. Stipules are pink-reddish and diamond-shaped.

The flowers of polynesian Ivy are small and white-green to tan-pink, appearing inconspicuously in late summer to early fall. They are arranged in branched clusters. Male flowers are 0.2-1.2 inches (0.6-3.0 cm) across and 0.8-5.5 inches (2-14 cm) long, with 5 tepals and 5 stamens. Female flowers are smaller, about 0.1 inches (3 mm) across, stalkless, and have 5 tepals. The flowers also exhibit a tinge of silver.

The stem of polynesian Ivy is semi-fleshy and slightly zigzag in shape. It appears greenish-pink and brownish with a fleshy texture. The stems of polynesian Ivy can root at the nodes upon contact with the ground, offering a unique growth pattern. These stems often show slight branching and have a somewhat robust appearance. Their thickness varies but typically measures around 0.2 inches (0.5 cm) in diameter, creating a distinctive profile for identification.

The fruit of polynesian Ivy is characterized as a collection of tiny achenes, taking an ovoid to ellipsoidal form which conveys a sense of an egg-like to slightly elongated shape. These achenes bear a unique, textured surface, described as tuberculate, which means they have small, rounded projections akin to tiny bumps. Due to their diminutive size, the precise dimensions and color are not specified, but one can expect them to be quite small, potentially needing magnification to appreciate the tuberculate texture fully. These key features, though minute, are distinctive and aid in the identification of polynesian Ivy's fruits.