Description from Flora of China
Quidproquo Greuter & Burdet.
Herbs annual or biennial, scabrous or hispid, rarely glabrous. Trichomes simple. Stems erect or prostrate, simple or branched. Basal leaves petiolate, rosulate or not, simple, dentate, lyrate, pinnatifid, or pinnatisect. Cauline leaves similar to basal, petiolate or uppermost subsessile. Racemes several flowered, ebracteate, elongated in fruit. Fruiting pedicels divaricate or reflexed. Sepals oblong or linear, erect, base of lateral pair saccate. Petals yellow, white, pink, or purple, usually with darker veins; blade obovate or suborbicular, apex rounded or emarginate; claw subequaling or longer than sepals. Stamens 6, strongly tetradynamous; filaments not dilated at base; anthers oblong or oblong-linear, obtuse at apex. Nectar glands 4; median pair oblong; lateral pair prismatic. Ovules 2-22 per ovary. Fruit indehiscent siliques or silicles, often lomentaceous, breaking into 1-seeded units, linear, oblong, ovoid, ellipsoid, or lanceolate, terete or polygonal, sessile, segmented; valvular segment rudimentary, seedless, as thick as or slightly thicker than pedicel, or absent; terminal segment few to many seeded, wingless, corky, smooth or strongly torulose or moniliform, ribbed longitudinally or not ribbed, antrorsely or retrorsely scabrous, or glabrous; replum absent; septum absent; style prominent or obsolete; stigma capitate, entire or slightly 2-lobed. Seeds uniseriate, wingless, oblong, ovoid, or globose, plump; seed coat minutely reticulate, not mucilaginous when wetted; cotyledons conduplicate.
Three species: Mediterranean region; two species (anciently introduced) in China.