Celsia Linnaeus.

Herbs, annual, biennial, or perennial. Leaves usually simple, alternate, basally rosulate. Inflorescences terminal, spicate, racemose, or paniculate. Calyx 5-lobed. Corolla usually yellow, rarely purple or white; tube short; limb rotate; lobes 5, subequal, radiate. Stamens 4 or 5; filaments usually woolly; anthers 1-loculed, confluent, anterior anthers linear-oblong or reniform, posterior anthers reniform or transverse. Ovary 2-loculed. Capsule septicidal. Seeds numerous, conically cylindric, 6-8-ribbed.

About 300 species: Asia, Europe; six species in China.