Erysimum flavum (Georgi) Bobrov

Erysimum species are annual, biennial or perennial herbs. Rootstocks taproot. Trichomes 2-5 rayed stellate, medifixed, forked, appressed, sessile. Stem erect, leafy, simple or usually branched from the base, sometimes branched above, pubescent, rarely glabrous. Basal leaves simple, in rosulate or not, lanceolate to obovate, base cuneate to attenuate, margin entire, dentate or pinnatifid, apex acute to obtuse, petiole short to sessile, cauline leaves, base cuneate, attenuate or rarely auriculate, margins entire or shallow dentate, petiole sessile or subsessile. Inflorescence raceme corymbs, few to many flowered, elongated or not in fruit, ebracteate or bracteate in lowermost flowers, rarely entirely bracteate. Flowers bisexual, yellow, purplish, pink, orange, violet or white, actinomorphic, pedicel erect, thick or slender, ascending, reflex or divaricate, sepals 4, subequal, erect, oblong, lateral pair base saccate or not, apex obtuse, petals 4, obovate-spathulate to suborbicular, base cuneate, margin entire, apex obtuse or emarginate, claw differentiated. Stamens 6, tetradynamous, filaments simple, anthers linear-oblong, nectar glands 2 to 4, confluent and subtending bases of stamens, median glands present or absent. Ovary superior, linear, ellipsoid-cylindrical, sessile, bicarpellary, syncarpous, pubescent, ovules 10-100. Fruit siliqua or rarely silicles, dehiscent, linear-ellipsoid to ovoid-linear, compressed, terete, quadrangular, angustiseptate, latiseptate, valves 1 veined flat, veins obscure or distinct, septum complete, style obsolete, stigma capitate, bilobed or entire. Seeds 5-20, uniseriate or biseriate, compressed or not, brown, oblong-ovoid, winged, minutely reticulate, mucilaginous when soaked, cotyledons usually incumbent rarely accumbent.

Erysimum species flowers are complete, bisexual, i.e., with functional male (androecium) and female (gynoecium), including stamens, carpels and ovary. Pollination is entomophilous i.e., by insects, or cleistogamy i.e., by self or allogamy i.e., by cross pollination. Flowering/Fruiting: May—September.

Seeds may be dispersed by autochory i.e., self dispersal, anemochory i.e., wind dispersal, zoochory i.e., dispersal by birds or animals, anthropochory i.e., dispersal by humans.

Erect highly variable perennial herbs, about 20-50 cm tall. Rootstocks slender branched, taproot. Malpighiaceous trichomes. Stem erect, simple or usually branched from the caudex, pubescent with trichomes. Basal leaves simple, in rosulate, variable, linear oblanceolate-oblong to lanceolate, about 10-60 x 5-9 mm across, base attenuate, margin entire or shortly dentate, apex acute, pubescent both above and beneath with simple and branched trichomes, midrib prominent beneath, petiole about 1-2 cm long, cauline leaves almost similar the basal leaves but smaller, petiole sessile.

Erysimum species are susceptible to various insect pests, virus, mildews and moulds.

Himalayas, altitude 900-4600m.

Not evaluated (IUCN).