Die International Union for Conservation of Nature and Natural Resources (IUCN) listet sechs der 25 Arten in einer Gefährdungskategorie auf ihrer Roten Liste. ###>They also classified six species as near threatened—"A. erinacea", "A. hirsuta", "A. lindeniana" (vulnerable according to the IUCN Red List), "A. linearis", "A. macroloba" and "A. simplex".