1915] 
Oenothera, 235-237; atrovirens, 41, 
42; biennis, 217, 225; cleistantha, 
41-44; cruciata, 41;  Lamarcki- 
ana, 235, 237, forma brevistylis, 
235, forma laevifolia, 235; muri- 
cata, 35, 146, 147, 217; Mutation 
Factor in Evolution; with particu- 
lar Reference to, 235; Oakesiana, 
41; pumila, 35, 154; Robinsonii, 
41-44; stenomeres, 41, 42; steno- 
petala, 41; Systematic Studies 
on,— V, 41; venosa, 41-44. 
Onoclea, 161; " nodulosa, 161, 162, 
164; Struthiopteris, 161, 162. 
Orange, Mock, 121. 
Orchis spectabilis, 204. 
Oryzopsis racemosa, 233. 
Osmunda caroliniana, 162; cinna- 
momea, 150; Claytoniana, 150. 
Ostrich Fern, 161; 'The American, 
161. 
Oxalis Acetosella, 152; 
154, 226. 
Oxybaphus, 202; floribundus, 
nyctagineus, 202. 
Ox eye Daisy, 225. 
corniculata, 
202; 
Paliurus, 49. 
Pallivicinia Flotowiana, 120. 
Panicum, 71, 72, 233; amarulum 
Hitche. & Chase, A teratologieal 
Specimen of, 72; Ashei, 71; bar- 
bulatum, 71; boreale, 153; capil- 
lare, 212, 225; Commonsianum, 
71; crusgalli, var. muricatum, 106; 
depauperatum, 71; dichotomiflo- 
rum, 212; implicatum, 153; latifo- 
lium 233; linearifolium, 65; muri- 
catum, 105, 106; pungens, 106; 
stipitatum, 160; strictum, 71; um- 
brosum, 71. 
Parentucellia, 194. 
Parietaria, 170; pennsylvanica, 170. 
Paronychia, 203; argyrocoma, var. 
albimontana, 203. 
Pease, A. S., Arenaria stricta in the 
White Mountains, 232; A north- 
ern Solidago in the White Moun- 
tains, 72. 
Pennsylvania, Antennaria canadensis 
in, 125. 
Perdicium semiflosculare, 135. 
Petalostemum corymbosum, 131, 137; 
pinnatum, 131, 137. 
Petasites, 66, 88; palmata, 66. 
Phalaris arundinacea, 212. 
Phegopteris hexagonoptera, 
polypodioides, 152. 
Philadelphus acuminatus, 122; Com- 
204; 
Index ‘ 
247 
binations, Two, 121; coronarius, 
122, 123, var. acuminatus, 122, 
var. satsumi, 121, var. tomentosus, 
122, 123; Gordonianus, 122; gran- 
diflorus, 122; intectus, 123; lati- 
folius, 122, 123;  Lewisii, 122; 
pubescens, 122, var. intectus, 123; 
satsumanus, 121, 122; satsumi, 121, 
122; tomentosus, 122; Yokohama, 
121; Yokohamae, 121. 
Philerea latifolio, 50. 
Phleum alpinum, 78; pratense, 212. 
Phoradendron flavescens, 64. 
Physostegia denticulata, 134, 137; 
purpurea, 134, 137; virginiana, 
134. 
Phytolacca, 180; americana, 180; 
decandra, 34,. 180. 
Phytolaccaceae, 180. 
Picea canadensis, 152; glauca, 62; 
mariana, 148, 149, 171; rubra, 148, 
152. 
Pigweed, 226. 
Pilea, 170; pumila, 170. 
Pines, Hemlock, 50. 
Pinus, 166, 167; Abies, 62; alba, 62; 
balsamea, 59, 60, 165-168; Bank- 
siana, 155; canadensis, 59-62, 
166-168; glauca, 62; laxa, 62; 
Picea, 60. 
Pistatia, 50. 
Plantago decipiens, 63, 147, 148, 218, 
221; major, 218; maritima, 63; 
Rugelii, 227. 
Plants and plant Societies at Roque 
Bluffs, Maine, 145. 
Pleienta, 55-57; capitata, 54, 55; 
fasciculata, 55; flexuosa, 55; gen- 
tianoides, 55; leucantha, 55; rigida, 
55 
Pleonosporium venustissimum, 95. 
Plocamium, 94, 96; coccineum, 93- 
95, forma compactum, 93, 94, var. 
flexuosum, 95; leptophyllum, 95, 
var. flexuosum, 95. 
Pluchea camphorata, 219. 
Plum, Cherokee, 49. 
Plurimaria, 56. 
Plymouth, Massachusetts, 
minima (L.) Desv. at, 97. 
Poa annua, 213, 227; compressa, 221; 
pratensis, 153, 213; triflora, 153, 
213. 
Podophyllum, 224. 
Podostemon ceratophyllum, 68. 
Pogonia, 150; ophioglossoides, 149. 
Polygala polygama, A new Form of, 
201, var. abortiva, 202, forma 
obovata, 201. 
Mibora 
