Alcea "Alcea" species are used as food plants by the larvae of some Lepidoptera species including "Bucculatrix quadrigemina" and "Vanessa cardui", the painted lady. The mallow flea beetle ("Podagrica fuscicornis") is a pest that makes tiny holes in the leaves. Cutworms, aphids, and capsid bugs use the plant as a food source in hotter and drier conditions. A number of weevils use "A. rosea" as their host plant, including "Rhopalapion longirostre", "Alocentron curvirostre", and "Aspidapion validum". The plants are also susceptible to the pathogenic fungus "Puccinia malvacearum", the hollyhock rust. A hollyhock flower, known in Japan as , was incorporated into
Canavalia rosea buoyancy of the seeds allows them to be distributed by ocean currents. The plant seems to contain L-Betonicine. "C. rosea" inhabits upper beaches, cliffs, and dunes throughout the world's coastal tropics. It is highly salt-tolerant and prefers sandy soils. Canavalia rosea Canavalia rosea is a species of flowering plant of the genus "Canavalia" in the pea family, Fabaceae, that has a pantropical distribution. Common names include beach bean, bay bean, seaside jack-bean, coastal jack-bean, and MacKenzie bean. Coastal jack-bean is a trailing, herbaceous vine that forms mats of foliage. Stems reach a length of more than and in thickness. Each