1919] 
Pleurogyne, 193, 194; brachyanthera, 
197; carinthiaca var. pusilla, 195; 
diffusa, 198; fontana, 195-197; 
Forresti, 197; himalayensis, 197; 
Lomatogonium the correct Name 
for, 193; Lubahniana, 198; ma- 
crantha, 197; Purshii, 195; rotata, 
195, 196, y americana, 197, var. 
americana, 195, 8 tenuifolia, 197, 
var. tenuifolia, 195; spathulata, 
198; Thomsoni, 197. 
Poa annua, 170; saltuensis, 201. 
Pogonia ophioglossoides, 119. 
Polemonium Van Bruntiae, S8. — . 
Polygala, 81; cruciata, 81, 119; 
lutea, 118, 119; Nuttalli, 81; 
paucifolia, 81, 199, var. alba, 81; 
polygama, 81, forma pallida, 82; 
sanguinea, 82, forma albiflora, 82; 
Senega, 202; verticillata, 82, var. 
ambigua, 82. - 
Polygalaceae, 81. 
Polygonaceae, 170. 
Polygonatum biflorum, 200. 
Polygonum, 140; aviculare, 170; 
from southeastern Massachusetts, 
A new, 140; Hydropiper, 142; 
minus, 142; Persicaria, 140, 142; 
puritanorum, 141, 143. 
Polypodiaceae, 173, 175; aculeatum, 
10; Filix-mas, 10; hexagonopterum, 
179; intermedium, 178; Leseblii, 
178; Phegopteris, 179; vulgare, 201. 
Polysiphonia ferulacea, 204, 206; 
japoniea, 206;  spinescens, var. 
sinensis, 207; urceolata, 206. 
Polystichum, 10; acrostichoides, 200; 
Lemmoni, 124; mohrioides, 124; 
scopulorum, 124. 
Polytaenia, 181; Nuttallii, 181, var. 
texana, 181, 182. 
Polytaenium, 181. 
Pontederia cordata, var. angustifolia, 
75. 
Poplar, 48. 
Populus, 190, angulatus, 101; bal- 
samifera, 43, 101, var. candicans, 
101, var. lanceolata, 101, var. 
Michauxii, 101; candicans, 101; 
deltoides, 101; heterophylla, 101; 
ontariensis, 101; tacamahaeca, 101, 
var. lanceolata, 101, var. Mi- 
chauxii, 101; viminea, 101. 
Potamogeton, 191; dimorphus, 191; 
heterophyllus, 191; natans, 75; 
perfoliatus, 191; Richardsonii, 191; 
zosterifolius, 191. 
Potentilla argentea, 106, 170; recta, 
106. 
Index 
231 
Pottia Randii, 35. 
Pretz, H. W., Discovery of Trisetum 
spicatum in Pennsylvania, 128. 
Primrose, The White-flowered Bird's 
Eye, 148. 
Primula, mistassinica, 148, forma 
leucantha, 148. 
Prunus, 190; pennsylvanica, 130, 
199; serotina, 199; virginiana, 
199. 
Ptelea, 49, 50, 81; trifoliata, 49, 81. 
Pteretis, 175; nodulosa, 175, 178. 
Pteridium, 176, 179; aquilinum, 179; 
latiusculum, 177, 179, var. pseudo- 
caudatum, 179. 
Pteris, 176, 177, 179; aquilina, 176, 
179, var. pseudocaudata, 179; 
latiusegla, 179; longifolia, 176. 
Pyenanthemum incanum, 201. 
Pyrola uniflora, 10. 
Pyrus, 190; americana, 201. 
Quereus, 189, 190; alba, 199; coc- 
cinea, 201; ilicifolia, 199; marilan- 
dica, 49; Muhlenbergii, 44; 
pagodaefolia, 49; palustris, 190; 
phellos, 49;  Prinus, 44, 199; 
rubra, 199. 
Ranunculaceae, 104, 170, An Omis- 
sion in the preliminary List of New 
England, 104. 
Ranunculus, 208; abortivus, 200, 
var. eucyclus, 200; acris, 170, 208; 
allegheniensis, 198; Boreanus, 208, 
in eastern New York, 208; cir- 
cinatus, 87, 191; recurvatus, 200; 
repens, 169, 'The Variations of, 
169, var. erectus, 169, var. gla- 
bratus, 169, var. linearilobus, 169, 
var. pleniflorus, 169, var. villosus, 
169. 
Raspberry, Red, 89. 
Red Raspberry, 89. 
Reports on the Flora of the -Boston 
District, —X X X. 78, XXXI. 125. 
Rhamnaceae, 128. 
Rhamnus, 128; alnifolia, 65; cathar- 
tica, 128; Frangula, 128. 
Rhexia virginica, 74, 119. 
Rhododendron eanescens, 199. 
Rhodomela subfusea, 206. 
hod palmata, var. sinensis, 
207. 
Rhus, 125; copallina, 125; Cotinus, 
125; glabra, 125; forma laciniata, 
125; Toxicodendron, 125, 201, var. 
radicans, 125; typhina, 125, 199; 
Vernix, 119, 125. 
