ˈ ̷ ̷ˌ ̷ ̷ noun
1. : any of several Old World herbaceous or subshrubby perennial cruciferous plants (genus Cheiranthus ) ; especially : a hardy erect herb ( C. cheiri ) that is widely cultivated for its showy very fragrant usually yellow or brownish yellow single or double flowers which appear early in the spring
2. : a plant of the genus Erysimum (as the wormseed mustard or prairie rocket)
3. : a person who from shyness or unpopularity remains on the sidelines of a social activity (as a dance)
a wallflower who never wants to meet people
men were scarce, and wallflowers wore their peculiar pathetic expression — John Galsworthy
4. or wallflower brown : a dark red to moderate reddish brown that is yellower than garnet brown — called also burnt russet, Cuba, palissandre
5. : an Australian desert shrub ( Gastrolobium grandiflorum )