The profusely branched stems of acleisanthes longiflora
are long and leafy, sometimes woody at the base, usually climbing or prostrate, but sometimes upright. Stems have a sparse covering of tiny, white, head-shaped hairs, more evident on new growth. Leaves are colored grey-green and are somewhat variable in shape, but generally a little longer than wide, blunt-pointed at the tip, with slightly wavy margins. Leaves are usually hairless but may also have fine hairs.
Flowers are solitary; they have a very slender, corolla-like perianth with a tube up to 6 inches long, sometimes faintly covered with hairs, opening to five fused lobes, overall about one inch in diameter. The tips of the lobes protrude slightly, and have a tuft of hairs. Included within the mouth of the tube are five stamens - white or pinkish filaments and green anthers. The style is exserted, held well above the anthers.