248 
Polygonaceae, 171, 222. 
Polygonella, 172; articulata, 34, 172. 
Polygonum, 172, 233; acre, 172, var. 
leptostachyum, 172, 215; amphi- 
bium, 172, forma Hartwrightii, 172, 
forma terrestre, 172; arenarium, 
172; arifolium, 172; aviculare, 
34, 172, 227, var. angustifolium, 
172, var. littorale, 173, var. vege- 
tum, 146, 173; Bellardi, 173; 
Bistorta, 173; Careyi, 173; cili- 
node, 152, 153, 173; Convolvulus, 
173; euspidatum, 173; Douglasii, 
233; dumetorum, 173, forma cris- 
tatum, 173; erectum, 173; ex- 
sertum, 173, 215,'221;  Fowleri, 
147; glaucum, 63, 173; Hydro- 
piper, 173, 215; hydropiperoides, 
173, var. strigosum, 173; lapathi- 
folium, 174, 215, var. incanum, 174, 
var. nodosum, 174; maritimum, 
63, 173; Muhlenbergii, 174; orien- 
tale, 174; pennsylvanicum, 174; 
215; Persicaria, 34, 174, 215, 225; 
prolificum, 173, 174, 215, 221; 
ramosissimum, 174, forma atlan- 
tieum, 174, 215, 221; rurivagum, 
174; sagittatum, 151, 174, 215; 
scandens, 174, 233; tenue, 174; to- 
mentosum, 174; virginianum, 174, 
224. 
Polypodium polypodioides, 64; vul- 
are, 152. 
Polysiphonia, 95. 
Polytrichum commune, 210. 
Pontederia cordata, 214. 
Ponthieva glandulosa, 136; 
mosa, 136. 
Populus grandidentata, 214; tremu- 
loides, 152, 214. 
Portulaca oleracea, 226. 
Potamogeton, 66, 211; alpinus, 150; 
race- 
amplifolius, 142; bupleuroides, 
210; confervoides, 66; crispus, 
210, 211, 221; dimorphus, 211; 
epihydrus, 150, 210; lucens, 142, 
A Coresi concerning Sagit- 
taria teres 142; 
natans, 150. 
Potentilla, 150; argentea, 35; cana- 
densis, 35, var. simplex, 154; mon- 
speliensis, 154, 216; nivea, 159; 
pacifica, 147, 208, 216, 221; palus- 
tris, var. villosa, 150; recta, 30; 
tridentata, 148, 154. 
Pottia truncata, 210. 
Prasium, 134; incarnatum, 134; pur- 
pureum, 134. 
Prenanthes alba, 135; 
Watson and, 
autumnalis, 
Rhodora 
[DECEMBER 
135, 137; nana, 154; trifoliolata, 
152; virgata, 135, 137. 
Pretz, H. W., Antennaria canaden- 
sis in Pennsylvania, 125. 
Pride of China Plants, 50. 
Primula farinosa, var. macropoda, 
154, 155. 
Propel vulgaris, 36, var. lanceolata, 
154. 
Prunus pennsylvanica, 152. 
Pseudochironia, 55. 
Pteris aquilina, 153; tremula, 64. 
Pterooatilori 135; pyenostachyum, 
135, 137. 
Pterosiphonia dendroidea, 95. 
Puecinellia angustata, 147;  mari- 
tima, 208, 213, 221. 
Purslane, 226. 
Pyrola americana, 152; elliptica, 
152; uniflora, 28. 
Pyrolaceae, 28. 
Pyrus americana, 152, 153; arbuti- 
folia, var. atropurpurea, 152; me- 
lanocarpa, 150; sitchensis, 152, 153. 
Quercus coccinea, 39; digitata, 39; 
faleata, 39; Michauxii, 40; mon- 
tana, 40;  Muehlenbergii, — 40; 
Prinos, 40; rubra, 39, 40; velu- 
tina, 39. 
Radicula palustris, 216, var. hispida, 
216. 
Ragweed, 225. 
Rajania, 130; ovata, 130. 
Ramnus Tree, 50. 
Range Extension of Ceanothus san- 
guineus, 229; Extensions of, 227; 
Extensions of two Grasses, 159. 
Ranunculus aeris, 35; Cymbalaria, 
79, 147, 208, 216; pennsylvanicus, 
151; repens, 35; sceleratus, 209, 
216. 
Raphanus Raphanistrum, 35. 
Rash Mycophagist, 30. 
Red Oak, 39. 
Rehder, A., The Name of the Hem- 
lock Spruce, 59. 
Reports on the Flora of the Boston 
District, — XX, 169, XXI, 202. 
Rheum, 174; Rhaponticum, 174. 
Rhexia Alifanus, 132, 137; glabella, 
132, 137. 
Rhinanthus Crista-galli, var. fallax, 
148. 
Rhododendron canadense, 148. 
Rhodymenia corallina, 93;  flabelli- 
folia, 93; Palmetta, 94. 
Rhus typhina, 217. 
