138 



Olive, E. W., 63 ; The uses of fungi 

 and bacteria in industry, 61 



Olneya, 131 



Omphalodes linifolia, 44 



Onagra biennis, 99 

 .O'Neal, C. E., 130 



Onoclea Struthiopteris, ■]•] 



Ononis arvensis, 42 



Opuntia, 64 ; humifusa, 95 



Orchids, Our native, 69 



Oregon, Additions to the flora of 

 western, during 1919, 37; Euceph- 

 alus, A new, 122; Tilia europaea 

 in, 31 



Origin and development of the Com- 

 positae, Small's (Review), 125 



Oryza, 86 



Osmanthus, 91 



Oxalis Acetosella, 118; stricta, 99 



Oxycoccus erythrocarpus, 119 



Oxydendrum, 91; arboreum, 119 



Oxytropis, 132 



Panicum capillare, 97, 98 ; hemitonion, 

 73 ; proliferum, 97, 98 



Paper mulberry (Broussonetia) an 

 " artillery plant," The, 52 



Parosela, 130 



Paspalum Vaseyanum, 71, 73 



Pasteur: the history of a mind, Du- 

 claux's (Review), 127 



Paulowinia tomentosa, 24, 97, 100 



Pectis, 126 



Pellett's American honey plants (Re- 

 view), 104 



Peloria in Viola primulaefolia Linn., 

 107 



Pennell, F. W., 9, 14, 15, 36, 62-65, 

 89, 128; Field excursions, 14, 15; 

 Proceedings of the Club. 63, 65, 89, 

 104, 128, 129; Soil preferences of 

 Scrophulariaceae, 10; Through the 



Andes of Colombia, 65 



Petalostemon, 130 



Peteria, 131 



Petunia violaceae, 97, 98, 100 



Phacelia Bolanderi, 43 ; californica, 

 43 ; nemoralis mutabilis, 44 . 



Philotria, 15 ; iowensis, 15 



Philotria, Notes on, 14, 15 



Phleum pratense, 98 



Pholiurus, 88 



Physalis pruinosa, 100 



Phytolacca decandra, 97, 99 



Pilea niuscosa, 52; puinila, 20; ser- 

 pyllifolia, 52 



Pin oak in Nebraska, 50 



Pinus, 91, 93; palustris, 72-74; resi- 

 nosa, 31; rigida, 119; Strobus, 17, 

 119 ; Taeda, 72—73 



Plantago lanceolata, 100; major, 100; 

 major intermedia, 44; Rugelii, 100 



Platanus, 71 



Pluteus cervinus, 15 



Poa, 121 ; annua, 99 



Podophyllum peltatum, 21 



Poganatum brevicaule, 29 



Poitea, 131 



Polycodium stamineum, 31 



Polygonum aviculare, 99 ; Convolvu- 

 lus. 99 : pennsylvanicum, 99 ; poly- 

 stachyum, 41 ; prolificum, 41 ; punc- 

 tatum leptostachyum, 99 



Polypodium polypodioides, 91-96 ; vul- 

 gare, 91, 94 



Pool. R. J., 106; Pin oak in Ne- 

 braska, 50 



Populus deltoides, 71; tremuloides, 

 97, 99 



Porana, 55 



Porodaedalea Pini, 14 



Portulaca oleracea, 99 



Potamogeton americanus, 18; pecti- 

 natus, 18 



Potentilla Dnnnmondii, 42 ; monspe- 

 liensis. 99 ; rivalis, 42 



Proceedings of the Club, 12, 35, 59, 

 61, 63, 65, 89, 104, 128, 129 



Proteaceae, 55 



Prothallia. The value of nutrient so- 

 lutions as culture media for fern, 

 76 



Prunella vulgaris, 118 



Prunus americana, 22, 119; pumila, 22 



Pseudotsuga Douglasii, 102, 103 ; 

 Douglasii caesia, 102, 103 ; glauca,^ 

 103; macrocarpa, 103; mucronata, 

 103 • 



Psoralea, 130 



Pteridium aquilinum, 17 



Puccinellia distans, 99 



Pyrola americana, wj 



Pyropolyporus ignarius, 118 



Quercus, 91, 92; acuminata, 51, 52; 

 alba, 51, 52, 74, 119; bicolor, 51, 

 52; coccinea, 51, 119; falcata, 73- 

 75 ; ilicifolia, 20 ; imbricaria, 51, 52 ; 

 macrocarpa, 51; marilandica. 51, 

 52, 75 ; Michauxii, 73-75 ; nigra, 

 71; palustris, 50-52, iig; Phellos, 

 72>, 75 ; prinoides, 51, 52; Prinus, 

 119; rubrar 51, 119; stellata, TZ,- 

 75; texana, 71; velutina, 51, 119 



