Catalogue › FlowersHorseweed (Laennecia)Every species of the genus Laennecia in the catalogue.Coulter's horseweed (Laennecia coulteri)Cochise horseweed (Laennecia eriophylla)Trans-Pecos horseweed (Laennecia filaginoides)Pineland horseweed (Laennecia schiedeana)Leafy horseweed (Laennecia sophiifolia)Turner's horseweed (Laennecia turnerorum)