Perennial sowthistle

M Madia elegans Madia elegans C Cluster tarweed Madia glomerata S Slender tarweed Madia gracilis C Chile tarweed Madia sativa S Scented mayweed Matricaria chamomilla P Pineappleweed Matricaria discoidea N Nigella-leaved mayweed Matricaria nigellifolia M Matricaria tenella Matricaria tenella M Mikania Mikania H Heartleaf hempvine Mikania cordifolia C Climbing hempweed Mikania scandens N Neonesomia palmeri Neonesomia palmeri O Oncosiphon grandiflorum Oncosiphon grandiflorum C Copperweed Oxytenia acerosa G Golden ragwort Packera aurea P Packera werneriifolia Packera werneriifolia P Parthenium weed Parthenium hysterophorus F Fringed sandmat Pectis ciliaris P Pectis papposa Pectis papposa H Hawkweed oxtongue Picris hieracioides O Orange hawkweed Pilosella aurantiaca M Meadow hawkweed Pilosella caespitosa T Tall hawkweed Pilosella cymosa M Mouse-ear hawkweed (Echioides) Pilosella echioides W Whiplash hawkweed Pilosella flagellaris K King devil Pilosella floribunda M Mouse-ear hawkweed Pilosella lactucella M Mouse-ear hawkweed Pilosella officinarum P Peleter's hawkweed Pilosella peleteriana T Tall hawkweed Pilosella piloselloides C Camphor pluchea Pluchea camphorata B Beautiful knapweed Psephellus bellus P Pseudelephantopus spicatus Pseudelephantopus spicatus C Cudweed Pseudognaphalium affine J Jersey cudweed Pseudognaphalium luteoalbum M Macoun's cudweed Pseudognaphalium macounii R Rabbit-tobacco Pseudognaphalium obtusifolium P Pseudognaphalium oligandrum Pseudognaphalium oligandrum C Cottonbatting plant Pseudognaphalium stramineum W Wavy-leaf cudweed Pseudognaphalium undulatum S Sticky cudweed Pseudognaphalium viscosum P Pyrrocoma lanceolata Pyrrocoma lanceolata P Pyrrocoma racemosa Pyrrocoma racemosa R Raoulia Raoulia R Rhaponticoides alpina Rhaponticoides alpina R Rhaponticum centauroides Rhaponticum centauroides S Scarious rhaponticum Rhaponticum scariosum C Cutleaf coneflower Rudbeckia laciniata S Schkuhria pinnata Schkuhria pinnata P Purple ragwort Senecio elegans F Fireweed groundsel Senecio glomeratus N Narrow-leaved ragwort Senecio inaequidens S Senecio isatideus Senecio isatideus L Linear-leaf groundsel Senecio linearifolius F Fireweed Senecio madagascariensis S Senecio retrorsus Senecio retrorsus E Eastern St. Paul's-wort Sigesbeckia orientalis S Silphium Silphium S Silphium integrifolium Silphium integrifolium M Mohrs rosinweed Silphium mohrii