1917] 
pensylvanicum, 70-72, The Varia- 
tions of, 70, var. genuinum, 72, 
var. laevigatum, 73, var. neso- 
philum, 73; punctatum, var. 
leptostachyum, 134; Raii, 235; 
sagittatum, 134, forma chlor- 
anthum, 134; strictum, var. 
subcontinuum, 134. 
Polygonums from New England, 
Two new, 232; new to North 
America, Some, 133. 
Polymnia, 46; Uvedalia, 46, 47, and 
its Varieties, 46, var. densipilis, 
48, var. floridana, 48, var. gen- 
uina, 47. 
Polymniastrum Uvedalia, 47. 
Polypodiaceae, 172, 177. 
Polypodium, 181; aculeatum, 181; 
cristatum, 181; Filix-femina, 179; 
Filix-mas, 181; noveboracense, 
181; rhaeticum, 181, 198, 203. 
Polytrichum strictum, 69. 
Pontederia cordata, 30, var. angusti- 
folia, 126. 
Populus grandidentata, 220; tremu- 
-  loides, 220. 
Potamogeton, 62, 80; angustifolius, 
107; confervoides, 107; Hillii, 63; 
niagarensis, 63; pulcher, 107; 
Robbinsii, 67. 
Potentilla fruticosa, 32, 164; inter- 
media, 227; palustris, 30; pumila, 
116, 220; recta, 66, 227; triden- 
tata, 227. 
ior near Ann Arbor, Michigan, 
3. 
Preliminary Lists of New England 
Plants,— XXV, 217. 
srr aca altissima, var. hispidula, 
53. 
of a farinosa, 92; mistassinica, 
Prunus, 62; americana, var. mollis, 
228; instititia, 228; nigra, 228; 
pumila, 63; virginiana, var. leu- 
cocarpa, 228. 
Psedera quinquefolia, var. hirsuta, 
230. 
Puccinellia, 120; angustata, 120; 
Borreri, 120; distans, 120; fasci- 
culata, 120; paupercula, var. 
alaskana, 120. 
Pyrola asarifolia, var. incarnata, 31, 
52; frutescens, 241; grandiflora, 
142; umbellata, 238, 241. 
Pyrus coronaria, 67. 
ellip- 
Quercus, 62; arizonica, 23; 
Index 
285 
soidalis, 67; Leana, 66; Muhlen- 
bergii, 128; rubra, var. ambigua, 
128. 
Radula obconica, 272; tenax, 263. 
Range of Carex novae-angliae ex- 
tended into Pennsylvania, 96. 
Ranunculus affinis, 138, var. leio- 
carpa, 138; allegheniensis, 224; 
Allenii, 138; filiformis, var. ovalis, 
137; Flammula, 135-137, y fili- 
formis, 137, var. intermedius, 136, 
137, a major, 137, var. reptans, 
136, var. unalaschcensis, 136, 137; 
Grayi, 138; laxicaulis, 137; New 
or critical Species or Varieties of, 
135; pedatifida, 138, var. cardio- 
phyllus, 138, var. leiocarpus, 138; 
Purshii, 135, var. prolificus, 135; 
pygmaeus, 138, var. petiolulatus, 
137, 188; repens, 139, var. flore- 
pleno, 139, var. pleniflorus, 138, 
139; reptans, 135-137, var. ovalis, 
137, var. strigulosus, 137; scelera- 
tus, 135; unalaschcensis, 137. 
Remarkable Colony of Bidens in 
Connecticut, 257. 
Remarks on several North American 
Species of Alopecurus, 165. 
Reseda, 218; alba, 217; lutea, 217; 
Luteola, 217; odorata, 217, 218. 
Resedaceae, 217. 
Rev. E. J. Hill, 61. 
Rhamnus alnifolia, 230; Frangula, 
230. 
Rhododendron canadense, 246. 
Rhynchospora alba, 32. 
Ribes nigrum, 226; 
albinervium, 226. 
Riccardia, 266. 
Riccia, 265; arvensis, 263; Beckeri- 
ana, 264; Beyrichiana, 264; Bis- 
choffi, 265; Frostii, 263-265; 
Lescuriana, 264; Watsoni, 264. 
Ricciella, 265; crystallina, 263. 
Rosa canina, 228; nitida, 228; spi- 
nosissima, 228. 
Rubus canadensis, 228; neglectus, 
227; phoenicolasius, 228; Randii, 
228; rosaefolius, 228. 
Rudbeckia from Indiana, A new, 113; 
Deamii, 113; hirta, 116; speciosa, 
113, 115, var. Sullivantii, 113. 
Rumex altissimus, 128; mexicanus, 
128; persicarioides, 258. 
Ruppia maritima, var. rostrata, 107, 
var. subcapitata, 107. 
Rynchospora capillacea, 122, var. 
triste, var. 
