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''Senecio'' 〔''Sunset Western Garden Book,'' 1995:606–607〕 is a genus of the daisy family (Asteraceae) that includes ragworts and groundsels. Variously circumscribed, the genus ''Senecio'' is one of the largest genera of flowering plants, cleaved or not of species belonging to other genera. The 'traditional' circumscription of ''Senecio'' is artificial, being polyphyletic. The flower heads are normally rayed, completely yellow, and the heads are borne in branched clusters. ''Senecio'' is one of the largest genera of flowering plants, and despite the separation of many species into other genera it still contains species of varied form, including leaf, stem and tuber succulents, annuals, perennials, aquatics, climbers, shrubs and small trees. Some species produce natural biocides (especially alkaloids) to deter or even kill animals that would eat them. ''Senecio'' species are used as food plants by the larvae of some Lepidoptera species — see list of Lepidoptera that feed on Senecio. Pyrrolizidine alkaloids have been found in ''Senecio nemorensis'' and in ''Senecio cannabifolius var. integrilifolius'' The name means "old man". ==Selected species== (詳細はSenecio ampullaceus'' — Texas ragwort, Texas squaw-weed, Texas groundsel, clasping-leaf groundsel *''Senecio angulatus'' L.f. — Creeping groundsel *''Senecio antisanae'' *''Senecio arborescens'' *''Senecio aureus'' L. — Golden ragwort * *''Packera aurea'' (L.) A. & D. Löve *''Senecio barbertonicus'' Klatt — Succulent bush senecio *''Senecio battiscombei'' * *''Dendrosenecio battiscombei'' *''Senecio bigelovii'' - Nodding groundsel *''Senecio brasiliensis'' (Spreng.) Less. — flor-das-almas * *''Cineraria brasiliensis'' *''Senecio cambrensis'' — Welsh groundsel, Welsh ragwort *''Senecio congestus'' (R. Br.) DC. — Marsh ragwort, Clustered marsh ragwort, marsh fleabane * *''Cineraria palustris'' * *''Othonna palustris'' * *''Tephroseris palustris'' *''Senecio douglasii'' - Threadleaf groundsel *''Senecio eboracensis'' Abbott & Lowe — York groundsel *''Senecio flaccidus'' Less. — Douglas senecio, threadleaf groundsel, threadleaf ragwort *''Senecio gallicus'' Chaix — Southern ragwort *''Senecio glabellus'' Poir. — Butterweed * *''Packera glabella'' (Poir) C. Jeffrey *''Senecio glaucus'' L. — Jaffa groundsel *''Senecio haworthii'' — Woolly senecio *''Senecio howeanus'' *''Senecio iscoensis'' — Hieron. *''Senecio jacobaea'' — Now classed as ''Jacobaea vulgaris''. *''Senecio keniensis'' * *''Dendrosenecio keniensis'' *''Senecio keniodendron'' — Giant groundsel * *''Dendrosenecio keniodendron'' *''Senecio keniophytum'' *''Senecio kleinia'' * *''Kleinia neriifolia'' *''Senecio lamarckianus'' *''Senecio leucanthemifolius'' Poir. — Coastal ragwort *''Senecio littoralis'' *''Senecio mikanioides'' — Cape ivy, German ivy * *''Delairea odorata'' *''Senecio nivalis'' Kunth *''Senecio obovatus'' Muhl. — Roundleaf ragwort * *''Packera obovata'' (Muhl. ex Willd.) *''Senecio patagonicus'' *''Senecio pauciradiatus'' *''Senecio pulcher'' *''Senecio rowleyanus'' — String of pearls *''Senecio sanmarcosensis'' *''Senecio scandens'' — German ivy *''Senecio squalidus'' — Oxford ragwort *''Senecio triangularis'' - Arrowleaf groundsel *''Senecio vaginatus'' *''Senecio vernalis'' — Eastern groundsel *''Senecio viscosus'' — Sticky ragwort *''Senecio vulgaris'' — Common groundsel, old-man-in-the-spring Formerly in ''Senecio'' * ''Brachyglottis greyi'' (as ''S. greyi'') * Florist's Cineraria, ''Pericallis × hybrida'' (as ''S. cruentus'') * ''Rugelia nudicaulis'' — Rugels ragwort 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Senecio」の詳細全文を読む スポンサード リンク
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