– camphorweed, fleabane Podachaenium Benth. ex Oerst. Podanthus Lag. Podocoma Cass. Podolepis Labill. Podotheca Cass. Poecilolepis Grau Pogonolepis Steetz Pojarkovia Askerova Poljakanthema Kamelin Poljakovia Grubov & Filatova Polyachyrus Lag. Polyanthina R.M.King & H.Rob. Polyarrhena Cass. Polycalymma F.Muell. & Sond. Polymnia Kalm Porophyllum Guett. – poreleaf Porphyrostemma Benth. ex Oliv. Praxeliopsis G.M.Barroso Praxelis Cass. Prenanthes L. – rattlesnakeroot Prestelia Sch.Bip. ex Benth. & Hook.f. Printzia Cass. Prolobus R.M.King & H.Rob. Prolongoa Boiss. Proteopsis Mart. & Zucc. ex Sch.Bip. Proustia Lag. Psacaliopsis H.Rob. & Brettell Psacalium Cass. – Indianbush Psathyrotes A.Gray – turtleback, brittlestem Psathyrotopsis Rydb. Psednotrichia Hiern Psephellus Cass. Pseudelephantopus Rohr – dog's-tongue Pseudobaccharis Cabrera Pseudobahia Rydb. – sunburst Pseudoblepharispermum J.-P.Lebrun & Stork Pseudobrickellia R.M.King & H.Rob. Pseudoclappia Rydb. – false clapdaisy Pseudoconyza Cuatrec. Pseudoglossanthis Poljakov Pseudognaphalium Kirp. – cudweed Pseudogynoxys (Greenm.) Cabrera Pseudohandelia Tzvelev Pseudonoseris H.Rob. & Brettell Pseudopegolettia H.Rob., Skvarla & V.A.Funk Pseudopiptocarpha H.Rob. Pseudopodospermum (Lipsch. & Krasch.) Kuth. Pseudostifftia H.Rob. Psiadia Jacq. Psilactis A.Gray – tansyaster Psilocarphus Nutt. – woollyheads Psilostrophe DC. – paperflower Psychrogeton Boiss. Pterachaenia (Benth. & Hook.f.) Lipsch. Pterocaulon Elliott – blackroot Pterochaeta Steetz Pteronia L. Pterothrix DC. Pterygopappus Hook.f. Ptilostemon Cass. Pulicaria Gaertn. – false fleabane Pulicarioidea Bunwong, Chantar. & S.C.Keeley Pycnosorus Benth. Pyrrhopappus DC. – desert chicory Pyrrocoma Hook. – goldenweed Pytinicarpa G.L.Nesom Q List of genera is from Plants of the World Online unless otherwise cited. Quadribractea Orchard Quasiantennaria R.J.Bayer & M.O.Dillon Quechualia H.Rob. Quelchia N.E.Br. Quinetia Cass. Quinqueremulus Paul G.Wilson R List of genera is from Plants of the World Online unless otherwise cited. Rachelia J.M.Ward & Breitw. Radlkoferotoma Kuntze Rafinesquia Nutt. – California chicory Raillardella (A.Gray) Benth. & Hook.f. – silvermat (?) Rainiera Greene Ramaliella Zaika, Sukhor. & N.Kilian Raoulia Hook.f. – vegetable sheep Raouliopsis S.F.Blake Rastrophyllum Wild & G.V.Pope Ratibida Raf. – prairie coneflower Raulinoreitzia R.M.King & H.Rob. Rayjacksonia R.L.Hartm. & M.A.Lane – tansyaster (?) Reichardia Roth – brighteyes Remya Hillebr. ex Benth. & Hook.f. Rensonia S.F.Blake Rhagadiolus Juss. Rhamphogyne S.Moore Rhanteriopsis Rauschert Rhanterium Desf. Rhaponticoides Vaill. Rhetinocarpha Paul G.Wilson & M.A.Wilson Rhetinolepis Coss. Rhodanthe Lindl. – sunray Rhodanthemum B.H.Wilcox, K.Bremer & Humphries Rhynchopsidium DC. Richterago Kuntze Richteria Kar. & Kir. Riencourtia Cass. Rigiopappus A. Gray Robinsonecio T.M.Barkley & Janovec Robinsonia DC. Rochonia DC. Roebuckiella P.S.Short Rojasianthe Standl. & Steyerm. Rolandra Rottb. – yerba de plata Roldana La Llave – groundsel Roodebergia B.Nord. Rothmaleria Font Quer Rudbeckia L. – coneflower Rugelia Shuttlew. ex Chapm. – Rugel's Indian plantain Rumfordia