Opercularia Gaertn.
Heads grouped together into a compound head. Plant usually foetid Opercularia
Seeds transversely wrinkled with 2 prominent smooth longitudinal ridges
Leaves lanceolate to ovate-lanceolate, usually 10–40 mm long, occasionally smaller. Whole plant scabrous-pubescent to almost glabrous. Variable shrub up to 2 m high. Widespread. Heath and DSF. Sandy and clay soils. Fl. spring–summer Opercularia aspera
Leaves oblong-linear to lanceolate, rarely broader, usually less than 12 mm long but sometimes up to 18 mm. Whole plant often glabrous. Spreading shrubby plant up to 50 cm high. Widespread. Heath and DSF. Fl. winter–spring Opercularia varia