The flower color of geranium viscosissimum
ranges from light pink to a rich purple, always with darker veins running lengthwise through the five rounded petals. Five narrow green sepals (tapering to a short spike) grow underneath the petals, visible only from below, and the flower head is supported by hairy, green, sticky stalks, branching readily. The flower is centered on ten stamens, curving away from the pistil. Leaves have many pointed lobes, growing around the base and some of the way up the stem. The lower halves of the upper surfaces of the petals are hairy. The fruit consists of a rigid capsule about 2 inches long, with a glandular (sticky) surface.