A tropical evergreen shrub, Sida rhombifolia, of the mallow family, originally introduced into Australia as a fodder crop and fibre plant, now a serious weed (also called Queensland hemp).
Origin
Late 19th century.
Definition of Paddy's lucerne in US English:
Paddy's lucerne
noun
Australian
A tropical evergreen shrub, Sida rhombifolia, of the mallow family, originally introduced into Australia as a fodder crop and fibre plant, now a serious weed (also called Queensland hemp).