North American Flora

Acad achenes acute anthesis apex apically aristae basally base biaristate Bidens blade body branched brown central ciliate cm long cm wide commonly Coreopsis Cosmos Dahlia disk-florets DISTRIBUTION dm tall elongate entire erect face Field Mus finally flat glabrate glabrous Gray green heads hispid Hort ILLUSTRATIONS inner Jour Known lanceolate lateral leaflets leaves leaves petiolate less LIBRARIES STANFORD UNIVERSITY ligulate florets linear lobes longer lower margins membranous Mexico minutely mm long mm wide narrowed narrowly numerous oblong obovate obtuse opposite outer bracts outer involucral bracts ovate paleae peduncles pedunculate with peduncles Perennial petiolate with petioles petiole included pilosa pinnately plants Proc Prodr pubescent Publ radiate rarely retrorsely barbed Rhodora scarcely segments serrate Sherff shorter simple slender slightly sometimes sparsely species spreading STANFORD UNIVERSITY LIBRARIES stem style-branches surface teeth terminal tetragonal TYPE LOCALITY UNIVERSITY LIBRARIES STANFORD upper wings yellow