163 



Onosmodiuni virginianum, 147 

 Opuntia austrina, 133; megacantha, 



33; Opuntia, 146 

 Oreobolus furcatus, 33 

 Oreodoxa regia, 137 

 Orobanche uniflora, 100 

 Orontium aquaticum, 11 

 Orton, C. R.,52 

 Osterhout, George E., A new Cirsium 



from South Dakota, 45 



Padus alabamensis, 98; Cuthbertii, 



98; neomontana, 98; serotina, 



98, virginiana, 145 

 Pady, S. M.,23 

 Pallavicinia lyellii, 124 

 Panax trifolium, 102 

 Panicum capillare, 142; Commonsi- 



anum, 142; depauperatum, 142; 



dichotomum, 142; huachucae, 



142; imbricatum, 33; isach- 



noides, 34; Scribnerianum, 142; 



sphaerocarpon, 142; virgatum, 



142 

 Parmelia conspersa, 20, 21; caperata, 



21; physodes, 21; rudecta, 21; 



sexatilis, 20, 21, 96; subaurifera, 



21 

 Parrotia persica, 75 

 Parthenocissus quinquefolia, 108, 146 

 Paspalum Muhlenbergii, 142; pubes- 



cens, 142 

 Peck, Morton E., 80 

 Pedicularis canadensis, 148 

 Peirce, George J., 26 

 Pellaea atropurpurea, 49 

 Peltandra virginica, 48 

 Pennell, Francis, 55 

 Penstemon hirsutus, 102 

 Pepo Pepo, 5; vulgaris, 5 

 Persicaria densiflora, 7; pennsyl- 



vanica, 144; portoricensis, 7 

 Pertusaria velata, 21 

 Pharbitis purpurea, 131 

 Phillips, E. P., 127 

 Phlox mesoleuca, 41 

 Phyla dulcis, 9; nodiflora, 9 

 Phyrma dehiscens, 9 



Physcia Clementina, 20; obscura, '><> 



l'li\ soderma zeae-niaydis, 13 



Physoderma and Ligniera, New sta- 

 tions for, J. S. Karling, 13 



Phytolacca americana, 144 



Piaropus crassipes, 136 



Picea rubra, 151 



Pinus australis, 133; caribaea, 133; 

 clausa, 133; resinosa, 111 ; rigida, 

 101, 111, 142; Strobus, 111; 

 virginiana, 111 



Piper methystichum, 34 



Pirone, P. P., 125 



Plagiochila asplenioides, 18 



Plantago decipiens, 124; halophila, 

 148; maritima, 148 



Platanus occidentalis, 112 



Pleuropterus cuspidatus, 7; Zuc- 

 carinii, 7 



Pluchea camphorata, 149, 150; pur- 

 purascens, 136 



Podophyllum peltatum, 102 



Pogonia verticillata, 101 



Pohlia proligera, 123 



Polygala ambigua, 145; cruciata, 

 150; lutea, 150; Rugelii, 134; 

 verticillata, 145 



Polygonatum biflorum, 102; com- 

 mutatum, 143 



Polygonella articulata, 144 



Polygonum acuminatum, 7; atlanti- 

 cum, 144; buxiforme, 144; cuspi- 

 datum, 7; densiflorum, 7, ecilia- 

 tum, 7; exsertum, 143; pictum, 

 7; portoricense, 7; Sieboldi, 7; 

 tenue, 144; Zuccarinii, 7 



Polypodium vulgare, 141 



Polystichum acrostichoides, 141 



Polytrichum commune, 123; pili- 

 ferum, 100, 123 



Pontedaria lanceolata, 136 



Populus grandidentata, 112 



Porella pinnata, 18 



Portulaca oleracea, 34 



Potentilla canadense, 145; monspeli- 

 ensis, 151 



Pratt, Robertson, Fruiting relations 

 of some Mycetozoa, 37 



