Free branching from base, with slender, 8–24 in.-long stems and blue-green, finely divided leaves. Single, satiny-petaled flowers about 2 in. wide; color varies from pale yellow to deep orange. Flowers close at night and on overcast days. In mild climates, it blooms from spring to summer and reseeds freely. Naturalized not just in California but also in parts of Hawaii. In cold-winter areas, generally used as a summer annual.