24. Dilophia Thomson, Hooker's J. Bot. Kew Gard. Misc. 5: 19. 1853.
双脊荠属 shuang ji ji shu
Herbs perennial. Trichomes absent or simple. Roots fleshy, conical. Stems erect, simple underground, branched aboveground. Basal leaves sessile, fleshy, rosulate, simple, entire or sinuate or dentate. Cauline leaves sessile, attenuate and not auriculate, entire. Corymbs several to many flowered, bracteate or ebracteate, simple or compound, not elongated in fruit. Fruiting pedicels ascending or divaricate. Sepals broadly ovate, persistent, ascending, glabrous or puberulent, base of lateral pair not saccate. Petals white or pink, longer than sepals; blade obovate or spatulate, apex obtuse or emarginate; claw obscurely to distinctly differentiated from blade. Stamens 6, slightly spreading, slightly tetradynamous; filaments not dilated at base; anthers ovate, apiculate at apex. Nectar glands confluent and subtending bases of all filaments. Ovules 4-12 per ovary. Fruit dehiscent silicles, obcordate, angustiseptate, sessile; valves membranous or thin papery, obscurely veined, glabrous or puberulent, rounded, smooth, apically gibbous and cristate; replum strongly flattened, base much broader; septum complete or perforated; style to 0.5 mm, included in apical notch of fruit; stigma capitate, entire. Seeds wingless, broadly oblong or ovoid, slightly flattened; seed coat minutely reticulate, not mucilaginous when wetted; cotyledons incumbent or oblique.
Two species: Bhutan, China, India, Kashmir, Kyrgyzstan, Nepal, Sikkim, Tajikistan; two species (one endemic) in China.