DC. Russowia C.Winkl. Rutidosis DC. S List of genera is from Plants of the World Online unless otherwise cited. Sabazia Cass. Sachsia Griseb. Salcedoa Jiménez Rodr. & Katinas Salmea DC. – bejuco de miel Sampera V.A.Funk & H.Rob. Sanrobertia G.L.Nesom Santolina L. – lavender cotton Santosia R.M.King & H.Rob. Sanvitalia Lam. – creeping zinnia Sarcanthemum Cass. Sartwellia A.Gray – glowwort Saussurea DC. – saw-wort Scabrethia W.A.Weber Scalesia Arn. Scapisenecio Schmidt-Leb. Scherya R.M.King & H.Rob. Schischkinia Iljin Schistocarpha Less. Schistostephium Less. Schizogyne Cass. Schizoptera Turcz. Schizotrichia Benth. Schkuhria Roth – false threadleaf Schlagintweitia Griseb. Schlechtendalia Less. Schoenia Steetz Sciadocephala Mattf. Sclerocarpus Jacq. – bonebract Sclerolepis Cass. – bogbutton Sclerorhachis (Rech.f.) Rech.f. Scolymus Tourn. ex L. – golden thistle Scorzonera L. – salsify Scorzoneroides Moench Scrobicaria Cass. Selloa Kunth Semiria D.J.N.Hind Senecio L. – groundsel, ragwort Sericocarpus Nees – whitetop aster Seriphium L. Serratula L. – plumeless saw-wort Shafera Greenm. Shangwua Yu J.Wang, Raab-Straube, Susanna & J.Quan Liu Sheareria S.Moore Shinnersia R.M.King & H.Rob. Shinnersoseris Tomb – beaked skeletonweed Siapaea Pruski Sidneya E.E.Schill. & Panero Siebera J.Gay Siemssenia Steetz Sigesbeckia L. – St. Paul's wort Siloxerus Labill. Silphium L. – rosinweed Silybum Adans. – milk thistle Simsia Pers. – bush sunflower Sinacalia H.Rob. & Brettell Sinclairia Hook. & Arn. Sinosenecio B.Nord. Sinoseris N.Kilian, Ze H.Wang & H.Peng Smallanthus Mack. Soaresia Sch.Bip. Solanecio (Sch.Bip.) Walp. Solenogyne Cass. Solidago L. – goldenrod Soliva Ruiz & Pav. – burrweed Sommerfeltia Less. Sonchella Sennikov Sonchus L. – sow thistle, sowthistle Sondottia P.S.Short Soroseris Stebbins Spaniopappus B.L.Rob. Sphaeranthus L. Sphaereupatorium Kuntze Sphaeromorphaea DC. Sphagneticola O.Hoffm. – creeping-oxeye Spilanthes Jacq. – toothache flower Spinoliva G.Sancho, Luebert & Katinas Spiracantha Kunth – dogwoodleaf Spiroseris Rech.f. Spongotrichum (DC.) Nees ex Spach Squamopappus R.K.Jansen, N.A.Harriman & Urbatsch Stachycephalum Sch.Bip. ex Benth. Staehelina L. Standleyanthus R.M.King & H.Rob. Staurochlamys Baker Steiractinia S.F.Blake Steirodiscus Less. Stenachaenium Benth. Stenocarpha S.F.Blake Stenocephalum Sch.Bip. Stenocline DC. Stenopadus S.F.Blake Stenops B.Nord. Stenotus Nutt. – mock goldenweed Stephanbeckia H.Rob. & V.A.Funk Stephanodoria Greene Stephanomeria Nutt. – wire lettuce Stevia Cav. – candyleaf Steviopsis R.M.King & H.Rob. Steyermarkina R.M.King & H.Rob. Stifftia J.C.Mikan Stilpnogyne DC. Stilpnolepis Krasch. Stilpnopappus Mart. ex DC. Stizolophus Cass. Stoebe L. Stokesia L'Hér. Stomatanthes R.M.King & H.Rob. Stomatochaeta (S.F.Blake) Maguire & Wurdack Stramentopappus H.Rob. & V.A.Funk Streptoglossa Steetz ex F.Muell. Strobocalyx (Blume ex DC.) Spach Strotheria B.L.Turner Struchium P.Browne Stuartina Sond. Stylocline Nutt. – neststraw, woolly fishhooks Stylotrichium Mattf. Symphyllocarpus Maxim. Symphyopappus Turcz. Symphyotrichum Nees