Stems: Upright, slender, sticky-hairy, up to 20 inches tall.
Leaves: Opposite, simple, ovate-lanceolate, pointed at the tip, more or less rounded at the base, without teeth, usually sticky-hairy, up to 1 1/2 inches long.
Flowers: 1-2 in the axils of the leaves, on short stalks.
Sepals: 6, united into a long tube, up to 1 inch long, glandular-hairy.
Petals: 6, unequal in size, purple, free from each other.
Stamens: Usually 11
Pistils: Ovary superior, with a curved gland at its base.
Fruits: Capsules oblongoid, containing several flattened, brownish seeds.
Notes: This species is sometimes called the clammy cuphea. Its scientific name is sometimes given as Cuphea petiolata.