240 
Oakesia sessilifolia, 128. 
Oat, Sand, 27, 29; Strand, 28. 
Oat-grass, 27. 
Oenothera, 14; cruciata, 108, 109, 
141; fruticosa, 108, var. hirsuta, 
108, 109, 141; pratensis, 109; 
pumila, 108. : 
Oleaceae, 184. 
Onoclea Struthiopteris, 111, 170. 
Orange Hawkweed, 104. 
Ornamental Shrubs of the United 
States, 207. 
Osmorhiza longistylis, 113. 
Ostrya virginiana, 128. 
Oxalis, 14. 
Painted Trillium, 163. 
Panax trifolia, 129. 
Panicum, 108, 218-220; dichotomi- 
florum, 220; dichotomum, 216; 
implicatum, 110; Lindheimeri, 216; 
multiflorum, 220; The North 
American Species of, 218; poly- 
anthes, 220; tennesseense, 110, 
133; viride, var. brevisetum, 134. 
Paper Birch, 178. 
Parnassia caroliniana, 112, 114, 117, 
118, 187; parviflora, 117. 
Parosela, 14. 
Parthenocissus, 14. 
Pasture Rose, 180; Thistles, east and 
west, 211. 
Pear, Sugar, 109. 
Pease, A. S., Agropyron caninum and 
its North American Allies, 61. 
Pedicularis canadensis, 108; lan- 
ceolata, 186, 192. 
Pedinophyllum, 200, 201; interrup- 
tum, 193, 200, 201; pyrenaicum, 
var. interrupta, 200. 
"x Fabroniana, 204; Neesiana, 
03. 
Peltandra, 5; angustifolia, 50; hetero- 
phylla, 49;  Rafinesque, Notes 
on, 47; sagittifolia, 47; undulata, 
48; virginica, 5, 48, 50, var. 
angust olia, 50, heterophylla, 
49, 50. 
Peltandrae, 47. 
Petasites vulgaris, 129. 
Philonotis, 152, 154; caespitosa, 
152, 153; fontana, 152, 153; 
marchica, 152; Muhlenbergii, 152. 
Phlox subulata, 129. 
Phragmites communis, 117-119. 
Physcomitrium immersum, 151. 
Picea, 177; canadensis, 103, 177; 
mariana, 177; nigra, 175, rubra, 
175, 177. 
Rhodora 
[DECEMBER 
Pinaceae, 103, 176. 
Pine, Pitch, 99, 176; Red, 176; 
White, 176. 
Pinguicula vulgaris, 117. 
Pinus, 176; resinosa, 103, 176, 217, 
in Norwood, Massachusetts, 217; 
rigida, 99, 176, for Coos County, 
New Hampshire, A fourth, 99; 
Strobus, 176. 
Pitch Pine, ee X in 
Plagiochila, 201; interrupta, 
200; "Pt 200; macrostoma, 
200; terio ig 200, var. inter- 
rupta, 200. 
Plantago, 109; decipiens, 109. 
Plants and Ferns of Connecticut, 
Flowering, 131; new to Massa- 
chusetts, Two, 204; of Brooklin, 
Maine, Woody, 173; of eastern 
Massachusetts flowering in April, 
1910, 127; of Wineland the 
Good, Notes on the, 17; Use of 
corrugated paper Boards in dry- 
ing, 221. 
Plum, Moxie, 183. 
Poa annua, 127; compressa, 214; 
pratensis, 214. 
Pogonatum brachyphyllum, 153; 
tenue, 153. 
Pogonia pendula 206;  triantho- 
hora, 206, in Holderness, New 
ampshire, 206. 
Poison Ivy, 181; Oak, 181. 
Polygala Senega, 113. 
Polygonatum biflorum, 128; gigan- 
teum, 189; latifolium, 189. 
Polygonum, 14; calophylla, 15; 
dumetorum, 189; Fowleri, 107; 
lilacina, 15. 
Pomme de terre, 34, 35. 
Pontederia, 7; cordata, 7. 
Pontederiaceae, 7. 
Poplar, Balsam, 178; Silver-leaved, 
178; White, 178. 
Populus, 178; alba, 9, 175, 178; 
balsamifera, 178; candicans, 175, 
178; grandidentata, 128, 178; 
tremula, 32; tremuloides, 128, 178. 
Porella pinnata, 204. 
Potamogeton, 204; hybridus, 204, 
var. multi-denticulatus, 204; Vas- 
eyi, 133; zosterifolius, 116. 
Potentilla, 180; Anserina, 112; ar- 
guta, 113; canadensis, var. sim- 
plex, 128; fruticosa, 112, 187; 
palustris, var. subsericea, 111, 140, 
var. villosa, 39, 111, 140; pumila, 
128; reptans, 189; tridentata, 180. 
Prairie Willow, 178. 
