climbing-buckwheat _erectum_ L. erect k. _hydropiper_ L. marshpepper s. _hydropiperoides_ Michx. swamp s. _lapathifolium_ L. (including _P. tomentosum_ of manuals) curltop s. _longistylum_ Small longstyle s. _pensylvanicum_ L. (including _P. omissum_ Greene) Pennsylvania s. _persicaria_ L. ladysthumb s. _persicarioides_ HBK. southwest s. _punctatum_ Ell. dotted s. _ramosissimum_ Michx. bushy k. _tenue_ Michx. slim k. _Polytaenia nuttalii_ DC. polytaenia _Portulaca_ L. portulaca; purslane _oleracea_ L. common purslane _parvula_ Gray slenderleaf purslane _Potentilla_ L. cinquefoil _arguta_ Pursh clammy c. _norvegica_ L. Norwegian c. _paradoxa_ Nutt. bushy c. _rivalis_ Nutt. brook c. _simplex_ Michx. (_P. canadensis_ of manuals, not L.) oldfield c. _sulfurea_ Lam. _Prenanthes aspera_ Michx. rough rattlesnakeroot _Prionopsis ciliata_ (see _Haplopappus ciliatus_) _Proboscidea louisianica_ (Mill.) Thell. (_Martynia l._ Mill.) common devilsclaw _Prunella vulgaris_ L. var. _lanceolata_ (Bart.) Fern. common selfheal _Psilostrophe villosa_ Rydb. paperflower _Ptilimnium nuttallii_ (DC.) Brit. mockbishopweed _Ptiloria_ (see _Stephanomeria_) _Pycnanthemum_ Michx. mountainmint _flexuosum_ (Walt.) BSP. slender m. _pilosum_ Nutt. woods m. _Pyrrhopappus_ DC. falsedandelion _carolinianus_ (Walt.) DC. Carolina f. _scaposus_ DC. (_P. grandiflorus_ Nutt.) tuber f. _Quincula_ (see _Physalis_) _Ranunculus_ L. buttercup; crowfoot _abortivus_ L. littleleaf b. _acris_ L. tall b. _cymbalaria_ Pursh shore b. _fascicularis_ Muhl. tufted b. _flabellaris_ Raf. threadleaf b. _hispidus_ Michx. bristly b. _longirostris_ Godr. longbeak b. _sceleratus_ L. cursed c. _Raphanus_ L. radish _Ratibida_ Raf. prairieconeflower _columnifera_ (Nutt.) Woot.