2(i4 



Rhodora 



[Deckmher 



rupestris, 11; serotina, 235; tri- 

 flora, 235. 

 Podophyllum, 213; peltatum, 213. 

 Podostemaoeae, 249. 



l'odostemum, 249; ceratophyllum, 

 249. 



Pogonia opbioglossoides, 26; pen- 

 dula, 25; trianthophora, 25, 26; 

 verticillata, 252, 253, Anomalous 

 Flowers of, 252. 



Poison Ivy, 94. 



Polyanthemum, 56. 



Polygonaceae, 36, 96. 



Polygonella, 70. 



Polygonum acre, var. leptostachyum, 

 96; aviculare, var. littorale, 36; 

 Fowleri, 29, 36; hydropiper, 36; 

 IVrsicaria, 36. 



Polypodiaceae, 31, 95. 



Polypodiuin vulgarc, 31. 



Polyscias, 153; Balfouriana, 153; 

 flilicifolia, 153; frutioosa. var. 

 plumata, 163; Guilfoylei, 153, 

 var. laciniata, 153, var. mon- 

 strosa, 153, var. Victoriae, 153. 



Pondweed, 71. 



Popple, ;'>•"). 



Poppy, California, 214. 



Popular Handbook to the Mosses, 

 201. 



Populus tremuloides, 35. 



Porella, 74, 75, SO, 84, 106, 10S, 109, 

 112; Jackii, 110; laevigata, 107; 

 Notarisii, 83; pinnata, 75, 79-82, 

 106 108; platvplivlla, 75, 82-84, 

 103, 105-112, 111, 116-119, var. 

 subsquarrosa, 103; platvphvl- 

 loidea, 75, 108, 109, 111-119; 

 platyphylloides, 84. 109; rivularis, 

 75, ' 108, 119; Sullivantii, 79; 

 Thuja, 84. 



I'ortulaca, 89; oleracea, 89. 



Portulacaceae, 89. 



Potamogeton, 121; borealis, 134, 

 136; columbianus, 124, 129; di- 

 versifolius, 13(>; epihydrus, 30, 

 33, 136; fasciculatus, 133; fili- 

 formis, 122, 132-134, 136, var. 

 alpinus, 133, var. borealis, 122, 

 134, 136, var. Macounii, 122, 136, 

 var. occidentalis, 132, 134; flabel- 

 latus, 124, 128, L29; foliosus, 136; 

 interrupt us, 124, 128, 129; interior, 

 132, 131; juncifolius, 138; lati- 

 folius, 122, 130; marinum, 136; 

 inarinus, 132, 133, var. .Macounii, 

 136, 138, var. occidentalis, 132; 

 moniliformis, 122, 130, 132; 

 Oakesianus, 30, 33; of the Section 



Coleophylli, A Revision of the 

 North American Species of, 121; 

 pectinatus, 121, 122, 124, 128-130, 

 133, 134, var. latifolius, 130; pusil- 

 lus, 33; Robbinsii, 122, 123; seta- 

 ceum, 134; vaginatus, 131, 132. 



Potamogeton § Coleophylli, 122. 



Potentilla anserina, 38; monspelien- 

 sis, 38; nivea, 101; pennsylvanica, 

 38; trident ata, 38. 



Prasiola stipitata, 90, 91. 



Prasiolaceae, 91. 



Prelirninarv Lists of New England 

 Hants,— XXIV, 245. 



Prenanthee altissima, 45; trifoliolata, 

 45. 



Primulaeeae, 12. 



Prunella vulgaris, 42. 



Primus, 67, 69, 202, 203; americana, 

 202; angustifolia, 202; Besseyi, 

 202; caroliniana, 202; cuneata, 26, 

 67-69, 201, in southern New 

 Jersey, Discovery of, 66; domes- 

 tica, Bubsp. insititia, 155, var. 

 insititia 155; geniculate, 202; 

 insititia, 155; maritima, 97, 202; 

 An overlooked environmental Fac- 

 tor for Species of, 201; pennsyl- 

 vanica, 38, 202; pumila, 70, 202; 

 salicina, var. pubipes, 155; serot- 

 ina, 140, 141, 202; sphaerocarpa, 

 202; triflora, var. pubipes, 155; 

 umbellata, 202; virginiana, 140, 

 141, the correct Name of the 

 Choke Cherry, 140. 



Pseuderanthemum laxiflorum, 159. 



Pteris aquilina, 31. 



Pubescent Form of Salix 1'va-ursi, 52. 



Puecinellia, 1-5, 1S1; airoidcs, 6, 16, 

 17, 23, 181; alaskana, 18; angus- 

 tata, 4, 19, 21, 23; arctica, 4; 

 Borreri, 9; coarctata, 5, 13, 15, 

 22; Cusickii, 181, 182; distans, 

 2, 5, 11, 22, 181, var. tenuis, 5, 12; 

 fasciculata, 5, 9, 22; in eastern 

 North America, The Genus, 1; 

 laurentiana, f>, 11, 17, 23; Lem- 

 moni, 183; lucida, 6, 17, 23, 181, 

 182; macra, 6, 15, 17, 22, 23; 

 maritima, 2 0, 8, 22, var. minor, 18, 

 21, 23; nutkaensis, 15, 22, 23; 

 Nuttalliana, 16, 181; paupercula, 

 6, 9, 18, 21, 23, var. alaskana, 0, 0, 

 17, 18, 21-23, var. longiglumis, 

 6, 20, 21, 23; phryganodes, 3 ">, 

 8, 9, 18, 1'.), 22; rupestris, 6, 10, 

 22; Some western Species of, 181; 

 vaginata, 14, 15; Vahliana, 4, 

 Pyrola, 71, 185; secunda, 187. 



