INDEX. 221 
Pinus strobus, 154, 164. 
Pinweed, 194. 
Pipsissewa, 197. 
Plane tree, 186. 
Plantago major, 159. 
rugeli, 160. 
Plantain, 159, 160, 170, 174, 208, 211. 
Plants of Winneshiek county, 147. 
Platanus occidentalis, 186. 
Pleurisy-root, 198. 
Plum, 182. 
Poa pratensis, 160, 167. 
Podophylium peltatum, 158, 162, 183. 
Poison ivy, 192. 
Polanisia trachysperma, 185. 
Polemonium reptans, 158, 199. 
Polygala sanguinea, 192. 
senega, 162, 192. 
verticillata, 191. 
viridscens, 192s 
Polygonum amphibium, 179. 
aviculare, 179. 
camporum, 179. 
convolvulus, 159, 180. 
douglassii, 180. 
dumetorum, 180. 
- emersum, 179. 
hydropiper, 179. 
incarnatum, 179. 
lapathifolum, 179. 
muhienbergit, 179. 
pennsylvanicum, 160, 179. 
persicaria, 179. 
sagittatum, 180. 
scandens, 180. 
tenue, 180. 
virginianum, 180. 
Polymnia canadensis, 209. 
uvedalia, 209. 
Polypodium vulgare, 163. 
Polypody, 163. 
Pondweed, 170. 
Poplar, 155, 156, 174. 
Populus: alba, 174 
balsamifera, 174 
candicans, 154, 174. 
deltoides, 153, 174. 
grandidentata, 154, 174. 
monilifera, 174. 
tremuloides, 154, 174. 
Portulaca oleracea, 159, 181. 
Potamogeton fluitans, 170. 
foliosus, 170. 
lonchites, 170. 
paucifiorus, 170. 
Potato vine, wild, 198. 
Potentilla arguta, 187. 
canadensis, 187. 
fruticosa, 187. 
monspeliensis, 187. 
norvegica, 187. 
tridentata, 187. 
Prenanthes alba, 205. 
racemosa, 20a. 
Primrose, evening, 160, 195. 
Prunelia vulgaris, 201. 
Prunus americana, 189. 
pennsylvanica, 155, 189. 
pumila, 153, 189. 
serotina, 154, 162, 189. 
virginiana, 154, 162, 189. 
Pteridium aquilinum, 164. 
Pteris aquilina, 164. 
Puccoon, 200. 
Pulsatilla hirsutissima, 157, 161, 183. 
Purslane, 159, 181, 192. 
Putty root, 174. 
Pycnanthemum, lanceolatum, 201. 
linifolium, 201. 
Pyrola elliptica, 197. 
secunda, 197. 
Pyrus arbutifolia, 188. 
coronaria, 188. 
Quercus alba, 154, 162, 177. 
borealis, 177. 
coccinea, 177. 
macrocarpa, 177. 
rubra, 154, 176. 
schneckii, 176. 
texana, 176. 
velutina, 177. 
Ragweed, 160, 206. 
Ranunculus abortivus, 183. 
aquatilis, 183. 
fascicularis, 157, 183. 
ovalis, 183. 
pennsylvanicus, 183. 
recurvatus, 183. 
rhomboideus, 183. 
septentrionalis, 183. 
Raspberry, 154, 161, 186. 
Ratibida pinnata, 209. 
Red-root, 154, 193. 
Red-top, 166. 
Reed-grass, Indian, 166. 
Reforestation, method of, 15z. 
Rhus glabra, 154, 161, 192. 
hirsuta, 154, 192. 
‘yadicans, 158, 161, 192. 
toxicodendron, 161, 192. 
typhina, 192. 
Ribes cynosbati, 158, 186. 
floridum, 153, 186. 
gracile, 186. 
missouriensis, 153, 186. 
rubrum, 155, 186. 
Rice, mountain, 166. 
