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Dense Spike-primrose is an annual with simple or branched stems that are 5-30 cm high. The sessile lower leaves are narrowly lance-shaped and 15-30 mm long with entire or sparsely-toothed margins, while the upper leaves are shorter and broader. Foliage is covered with soft, white, short or long hairs and may also be glandular. Flowers are borne in the axils of the upper leaves in dense spike-lik...

Common Clarkia is an annual with mostly unbranched stems that are 15-50 cm tall. The few leaves are opposite and have 1-3 cm long petioles and lance-shaped to elliptic, entire-margined, 2-7 cm long blades. The herbage is sparsely covered with short hairs. The few flowers are borne in a loose, narrow, nodding inflorescence which terminates the stem; the 4 separate petals are spoon-shaped, 5-10 mm...

Obscure Evening-primrose is a small annual herb with stems, 3-15 cm high, that branch from the base and make the plant broader than it is tall. The strap-shaped leaves, 5-25 mm long, are clustered at the base of the plant and at the upper portions of the stems. Foliage is finely hairy. Tiny flowers are attached to the stem at the base of upper leaves. The 4 separate, yellow petals are 1-2 mm lon...