1900] 
Pilinia maritima, 44. 
Pink-flowered Form of Rubus tri- 
florus, 87. 
Pinus resinosa, 124; rigida, 124. 
Pisum sativum, 92. 
Plagiochila asplenioides, 63. 
Plagiothecium denticulatum, 63; late- 
bricola, 96; turfaceum, 63. 
Plant Relations, Notice of, 40. 
Plantago elongata in New England, 
156, in Rhode Island, 194; major, 
208; maritima, 188; pusilla, 156, 
194; virginica, 214. 
Plants from the Duck Islands, 
Maine, 207. 
Plectonema calothrichoides, 13, 42; 
Golenkinianum 13, 42; terebrans, 42. 
Plenosporium Borreri, 51. 
Pleurocapsa fuliginosa, 42. 
Plumaria elegans, 5I. 
Poa compressa, 209; pratensis, 209. 
Podostemon ceratophyllum, 157. 
Pogonatum alpinum,63,96; tenue, 62. 
Pogonia ophioglossoides, 114, 172, 
208, 219; pendula, 211, 212, in 
Maine, 211; verticillata, 219. 
Pogotrichum filiforme, 206, 207. 
Polemonium, 77. 
Polycystis elabens, 42; pallida, 43. 
Polyembryony in Spiranthes cernua, 
227. 
Polygala cruciata, 168; polygama, 
189, 242, var. abortiva merely an 
Autumnal State, 242. 
Polygonatum giganteum, I7I. 
Polygonella articulata, 121, 202. 
Polygonum acre, 69; Hydropiper, 
208; hydropiperoides, 124; incarna- 
tum, 208; Muhlenbergii, 69, 202. 
Polyides rotundus, 51. 
Polymnia canadensis in Vermont, 70. 
Polypodium vulgare, 183, 184, 229. 
Polyporus, 210. 
Polysiphonia atrorubescens, 51; elon- 
gata, 51; fastigiata, 5I; fibrillosa, 
51; Harveyi, 51; nigrescens, 5I; 
Olneyi, 51; subtilissima, 51; urceo- 
lata, 51, 210; variegata, 51; vestita, 
51; violacea, 5I. 
Populus balsamifera, 35; heterophyl- 
la, 126; monilifera, 35. 126. 
Porphyra coccinea, 5I; laciniata, 51; 
leucosticta, 51; miniata, SI. 
Potamogeton, 217; and Spiraea, 
Varieties of, 102; gemmiparus, 68; 
Nuttallii, 102, var. cayugensis, 102; 
praelongus, 127; pulcher, 157. 
Potentilla Anserina, 134; frigida, 
109; fruticosa, 37, 124; litoralis, 
Index 257 
188, 208; palustris, 122; tridentata, 
97, 136, 188. 
Poterium canadense, 122. 
Pownal, Vermont, New or Rare 
Plants from, 171. 
Prasinocladus, 111; subsalsus, 45. 
Preliminary Lists of New England 
Plants,—v. Marine Algae, 41; vi. 
Leguminosae, 89. 
Prenanthes alba, 208; 
208; trifoliata, 
Primula mistassinica, 136. 
Pringsheimia scutata, 45. 
Prinos padifolius, 105, 106; verticilla- 
tus, 105, 106 
Protoderma marinum, 45. 
Providence, Old-time Flora of, 213. 
Prunus serotina, 187. 
Pteris aquilina, 183, 229; cretica, 88. 
Ptilota pectinata, 5I. 
Punctaria, 131, 206; 
plantaginea, 47. 
Pylaiella littoralis, 47. 
Pyrus arbutifolia, 69; nigra, 69; sam- 
bucifolia, 98. 
= 
serpentaria, 
latifolia, 47; 
Quercus, 241; ilicifolia, 36; macro- 
carpa, 36; Muhlenbergii, 36; palus- 
tris, 36; stellata, 36. 
Rafflesia, 1. 
Ralfsia Borneti, 12, 47; clavata, 47; 
deusta, 47, 209; pusilla, 48; verru- 
cosa, I2, 48. 
Rand, Edward L., Plants from the 
Duck Islands, Maine, 207. 
Ranunculus abortivus, 171; bulbosus, 
171; Cymbalaria, 218; fascicularis, 
171; hederaceus, 137; hispidus, 171; 
pennsylvanicus, 122; repens, 201; 
sceleratus, 157. 
Raphidostegium recurvans, 63. 
Rare Plants from Pownal, Vermont, 
New or, 171. 
Rarer Plants of central Massachu- 
setts, Notes on distribution of, 119. 
Razoumofskya robusta, 4. 
Rediscovery of Eleocharis diandra, 
Relation of certain plants to Atmos- 
pheric Moisture, 29, 63. 
Remarkable Development of Steir- 
onema lanceolatum, 190. 
Representatives of Scirpus maritimus 
in America, 239. 
Reversions in Berberis and Sagit- 
taria, 140. 
Rhadinocladia, a new Genusof Brown 
Algae, 111; Farlowii, 112. 
Rhinanthus, 138. 
