42. Armoracia P. Gaertner et al., Oekon. Fl. Wetterau. 2: 426. 1800.
辣根属 la gen shu
Raphanis Moench, nom. rej.
Herbs perennial with rootstocks. Trichomes absent. Stems erect, branched above. Basal leaves long petiolate, rosulate, simple, entire or crenate. Cauline leaves petiolate or uppermost sessile, crenate, laciniate, pinnatifid, or pinnatiscent. Racemes many flowered, ebracteate, often in corymbose panicles, elongated considerably in fruit. Fruiting pedicels slender, ascending, divaricate, or slightly reflexed. Sepals ovate or oblong, spreading or ascending, glabrous, base of lateral pair not saccate. Petals white, ascending, longer than sepals; blade obovate, spatulate, oblong, or oblanceolate, apex obtuse; claw short. Stamens 6, somewhat spreading, slightly tetradynamous; filaments slightly dilated at base; anthers ovate, oblong, or linear, obtuse at apex. Nectar glands confluent and subtending bases of all stamens; median glands present. Ovules 8-20 per ovary. Fruit dehiscent silicles, oblong, ovate, elliptic, or orbicular, angustiseptate, sessile; valves veinless, glabrous, smooth; replum rounded; septum perforated or reduced to a rim; style obsolete or short and to 2 mm; stigma capitate, entire or 2-lobed. Seeds biseriate, wingless, oblong, plump; seed coat punctate, not mucilaginous when wetted; cotyledons accumbent.
Three species: C and S Europe, Russia; one species (introduced) in China.