The narrow, arrow-shaped, opposite leaves of Microloma sagittatum have visible midribs and whitish hairs on the blades. The leaf margins are rolled under. Leaves and flowers grow on several, slender, twining vines that may reach 1 m.
The cylindrical corolla is based on a pink or white star-shaped calyx with conspicuous, pointed tips.
Pollination happens when sunbirds pierce the closed flower corollas with their sharp beaks in search of nectar. Pollen is caught upon their tongues for involuntary delivery to other flowers while the birds feed (Bond and Goldblatt, 1984; Vlok and Schutte-Vlok, 2010).