Diptera Borkhausen.

Herbs perennial, forming erect individuals, lacking basal bulbils. Leaves alternate, all basal, petiolate; leaf blade herbaceous or leathery, lacking chalk glands, margin lobed; foliar crystals present mainly as druses. Flowering stem usually scapose; inflorescence cymose. Flowers bisexual, zygomorphic, 5-merous. Petals white or pink, not callose. Filaments clavate; pollen 2-nucleate, exine tectum smooth. Carpels connate at least proximally, dehiscing distally in fruit. Ovary superior. Integuments 2.

About ten species: China, Japan; seven species (four endemic) in China.