1908] 
Pandora Gouldiana, 44. 
Panicum Boscii, var. molle, 64; co- 
lumbianum, var. thinium, 64; hua- 
chucae, var. silvicola, 64; lanugino- 
sum, 65; latifolium, var. molle, 64; 
miliaceum, 153; unciphyllum, var. 
thinium, 64; Walteri, 153. 
Parlin, J. C., Some Maine Addenda, 146. 
Parmelia caperata, 36. 
Parnassia caroliniana, 164. 
Parthenocissus, 24, 25, 
28; laciniata, 27; quinquefolia, 
25, var. laciniata, 28; radicantis- 
sima, var. minor, 27; Saint-Paulii, 
27; vitacea, var. dubia, 28; tri- 
euspidata, 29. 
Pease, A. S., Four introduced Plants 
at Cambridge, Massachusetts, 167; 
Preliminary Lists of New England 
Plants, — XV. Addenda, 36. 
Peat-Moss, 113. 
Pecten, 44, 45; gibbus, var. borealis, 
44; irradiens, 46. 
Peirce, M. F., Note on Weigela rosea, 
131. 
Pellaea gracilis, 35. 
Pellia epiphylla, 192. 
Peltandra, 166. 
Petasites palmata, 146; vulgaris, 151. 
Petrocelis, 158 159; cruenta, 158, 159; 
Hennedyi, 159; Middendorffii, 158, 
159. 
Petunia nyctaginifolia, 153. 
Phaca elegans, 33; parviflora, 33. 
Phaeophyceae, 116. 
Phalangium quamash, 31. 
Phalaris canariensis, 153. 
Phegopteris hexagonoptera, 166. 
Phragmidium, 13, 14; gracile, 14. 
Phragmites, 153; communis, 146, 153. 
Phyllophora Brodiaei, var. interrupta, 
116, forma pygmaea, 116. 
hirsuta, 26, 
Physocarpus opulifolius, var. inter- 
medius, 32. 
Picea, 63; Abies, 63; excelsa, 63; 
mariana, 63; rubra, 63. 
Pieris nitida, 53. 
Pilinia, 122, 124, 127, 156; endophy- 
tica, 156; The Genus, 122; Lunatiae, 
122, 123, 125, 127; maritima, 122, 
126; minor, 122, 124, 156; Morsei, 
122, 126, 127; Reinschii, 122, 125, 
126; rimosa, 122, 126. 
Pinaceae, 62. 
Pinus, 62; resinosa, 62; rigida, 62; 
r Strobus, 62; sylvestris, 62. 
Plantago major, 207; Rugelii, 145, 207. 
Plants at Cambridge, Massachusetts, 
Index 
229 
Four introduced, 167; of Mount 
Desert Island, Additions to the, 145; 
or northeastern America, Notes on 
some, 46, 84; of the northeastern 
United States, Notes on the vascular, 
29, 64; of Tiverton, Rhode Island, 
112; Preliminary Lists of New Eng- 
land,— XV. Addenda, 36, XIX. 
Addenda, 71, XXI. Cyperaceae, 135, 
XXII, 168. 
Plectonema, 162; Battersii, 162; calo- 
thrichoides, 162. 
Pleurocapsa fuliginosa, 160. 
Pleurogyne rotata, 201. 
Pleuroschisma  deflexum, 
crenatum, 190. 
Pleurosigma attenuatum, 183; simile, 
180; subsalinum, 180. 
Pluchea camphorata, 153. 
Poa alpina, 201; alsodes, 146; 
nens, 95. 
Pogonatum alpinum, var. arcticum, 72. 
Polycodium neglectum, 53. 
190; tri- 
emi- 
Polycystis, 162; elabens, 162. 
Polygala, 174. 
Polygonatum, 130;  biflorum, 130; 
giganteum, 130. 
Polygonum arenarium, 152; cristatum, 
31, 32; cuspidatum, 152; dume- 
torum, 32, forma cristatum, 31; 
exsertum, 154; Fowleri, 144; Hart- 
wrightii, 146; lapathifolium, 153; 
orientale, 153; pennsylvanicum, 153; 
Persicaria, 153; prolificum, 154. 
Polysiphonia, 134; Harveyi, 43; nig- 
rescens, 116; Olneyi, 43. 
Polytrichum commune, 
goniale, 72; gracile, 72. 
Pond Lily, White, 49. • 
Porella pinnata, 192. 
Portlandia, 45; arctica, 45; lucida, 45. 
Potamogeton, 170; alpinus, 168; amer- 
icanus, 168, var. novaeboracensis, 
168; amplifolius, 168; angustifolius, 
168, 170, var. connecticutensis, 168, 
170; bupleuroides, 46, 168, 170; 
confervoides, 168, 170; crispus, 168; 
dimorphus, 168; epihydrus, 168, 
170, var. cayugensis, 168, 170; X 
Faxoni, 168; filiformis, 168, 171; 
foliosus, 168, var. niagarensis, 168; 
Friesii, 168; gemmiparus, 168, 171; 
heterophyllus, 168, 171, forma gram- 
inifolius, 168, forma longipeduncu- 
latus, 168, forma maximus, 169, 
forma myriophyllus, 169, forma 
terrestris, 169; Hillii, 169; hybridus, 
169, var. multi-denticulatus, 169; 
var. peri- 
