P. Gaertner

Oekon. Fl. Wetterau 2: 426. 1800

Common names: Horseradish
Etymology: Ancient Greek name for horseradish, or perhaps Celtic ar, near, mor, sea, and rich, against, alluding to habitat
Treatment appears in FNA Volume 7. Treatment on page 459. Mentioned on page 226, 232, 238.
Perennials; (aquatic or of mesic habitats, with rootstocks); not scapose; glabrous. Stems erect, branched distally. Leaves basal and cauline; petiolate and sessile; basal rosulate, long-petiolate, blade margins crenate or pinnatifid [entire]; cauline petiolate or sessile distally, blade margins crenate, serrate, pinnatifid, pinnatisect [laciniate]. Racemes ([often corymbose-paniculate], several-flowered), considerably elongated in fruit. Fruiting pedicels ascending, divaricate, or slightly reflexed, slender. Flowers: sepals spreading or ascending, ovate or oblong, lateral pair not saccate basally, (glabrous); petals white, obovate, or oblanceolate [spatulate, oblong], claw somewhat differentiated from blade (relatively short, apex obtuse); stamens slightly tetradynamous; filaments slightly dilated basally; anthers ovate [oblong or linear], (apex obtuse); nectar glands confluent, subtending bases of stamens, median glands present. Fruits: silicles, sessile, oblong, ovate, elliptic, or orbicular, angustiseptate; valves each not veined; replum rounded; septum perforated or reduced to a rim; ovules 8–12[–20] per ovary; style obsolete or distinct; stigma capitate, (sometimes 2-lobed). Seeds biseriate, plump, not winged, ovate [oblong]; seed coat (punctate) not mucilaginous when wetted; cotyledons accumbent.


c, s Europe, Asia (Russian Far East, Siberia).


Species 3 (1 in the flora).

Lower Taxa