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Webster 1913 Edition

Noun.

(Bot.)

A perennial, cruciferous plant (

Cheiranthus Cheiri

), with sweet-scented flowers varying in color from yellow to orange and deep red. In Europe it very common on old walls.

☞ The name is sometimes extended to other species of

Cheiranthus

and of the related genus

Erysimum

, especially the American

Western wallflower

(

Erysimum asperum

), a biennial herb with orange-yellow flowers.

A lady at a ball, who, either from choice, or because not asked to dance, remains a spectator.

[Colloq.]

Wallflowers

wallflower ‎(plural wallflowers)

Any of several short-lived herbs or shrubs of the Erysimum genus with bright yellow to red flowers.
Gastrolobium grandiflorum, a poisonous bushy shrub, endemic to Australia.
(informal) A person who is socially awkward, especially one who does not dance at a party due to shyness.

any of several short-lived herbs or shrubs of the Erysimum

socially awkward person