| Phytolaccaceae |
Phytolacca |
| Piperaceae |
Peperomia, Piper |
| Plantaginaceae |
Mecardonia, Melosperma, Micranthemum, Monttea, Ourisia, Plantago, Stemodia |
| Poacaeae |
Jarava |
| Poaceae |
Agropyron , Agrostis, Amelichloa, Anatherostipa, Andropogon, Antonella , Aristida, Blepharidachne, Bromus, Chaetotropis, Chloris, Chusquea, Cynodon, Danthonia, Deschampsia, Deyeuxia, Digitaria, Distichlis, Elymus , Eriochloa, Festuca, Glyceria, Guadua, Gymnopogon, Helictotrichon , Hierochloë , Hordeum, Jarava, Koeleria, Leymus, Melica, Mesosetum, Monanthochloe, Muhlenbergia, Munroa, Nassella, Neobouteloua, Nicoraepoa, Oplismenopsis, Panicum, Pappostipa, Paspalum, Pennisetum, Phalaris, Phippsia, Piptochaetium, Poa, Polypogon, Puccinellia, Rytidosperma, Setaria, Sporobolus, Stipa, Tragus, Tridens, Trisetum, Zizaniopsis |
| Podostemaceae |
Wettsteiniola |
| Polemoniaceae |
Giliastrum |
| Polygalaceae |
Bredemeyera, Monnina, Polygala |
| Polygonaceae |
Rumex |
| Polypodiaceae |
Campyloneurum, Pecluma |
| Portulacaceae |
Anacampseros, Calandrinia, Cistanthe, Grahamia, Portulaca, Schreiteria |
| Primulaceae |
Androsace, Primula |
| Pteridaceae |
Cheilanthes, Pteris |
