FLOWERING PLANTS. 29 



MUHLENBERGIA, Schreb. 



difusa, Schreb. nimble will, 

 wildenovii, Trin. 



MYRIOPHILLUM, Vaill. water milfoil, 

 spicatum, L. 

 scabratum, Mx. 

 ambiguum, Nut. 



0. 



OSMORRHIZA, Raf. 



longistyles, D. C. sweet cicely, 

 brevistyles, D. C. 



P. 



PANICUM, L. 



clandestinum, L. 

 dichotonum, L. 

 depauperatum, Mx. 

 nitidum, Lk. 



PHLEUM, L. 



pratense, L. timothy grass. 



PHYSALIS, L. 



obscura, Mx. 

 pennsylvanica. 



POLYGONUM. L. 



mite, Pers. 



orientale, L. 



scandens, L. false buckwheat. 



lapathifolium, L. 



POTAMOGETON, Town. 

 pauciflorum, Ph. 



PYCNANTHEMUM, Mx. 

 lanceolatum, Ph. 



Q. 



QUERCUS, /.. 



tinctoria, Bart, black oak. 



R. 



RANUNCULUS, L. 



flamula, L. spear-wort, 

 acris, L. 



ROSA, Tourn. 



lucida, Ehrb. 

 blanda, Ail. 



