196 



MIDDLESEX FLORA. 



Plum, 30. 



Plumbaginaceae, 65. 

 Poa, 130. 

 Podophyllum, 3. 

 Podostemaceae, 90. 

 Podostemon, 90. 

 Pogonatum, 145. 

 Pogonia, 104. 

 Poison Hemlock, 42. 

 Poison Ivy, 21. 

 Poke, 83. 



Polemoniacese, 77. 

 Polygala, 22. 

 Polygalaceae, 22. 

 Polygonacese, 86. 

 Polygonatum, 108. 

 Polygonum, 86. 

 Polypodium, 135. 

 Polypody, 135. 

 Polypogon, 127. 

 Polysiphonia, 152. 

 Polytrichuin, 145. 

 Pond Lily, 4. 

 Pondweed, 99. 

 Pontederia, 110. 

 Pontederiacese, 110. 

 Poplar, 96. 

 Poppy, 4. 

 Populus, 96. 

 Porphyra, 153. 

 Porphyridium, 158. 

 Portulaca, 17. 

 Portulacaceae, 17. 

 Potamogeton, 99. 

 Potato, 78. 

 Potentilla, 31. 

 Poterium, 31. 

 Pottia, 141. 

 Poverty Grass, 125. 

 Prairie Clover, 26. 

 Prairie Dock, 51. 

 Prenanthes, 59. 

 Prickly Ash, 20. 

 Prickly-pear, 39. 



Primrose, 65. % 

 Primulacese, 65 

 Prince's Feather, 86. 

 Prince's Pine, 63. 

 Privet, 82. 

 Proserpinaca, 37. 

 Protococcaceae, 158. 

 Protococcus, 158. 

 Prunus, 30. 

 Ptelea, 20. 

 Pteridophytes, 135. 

 Pterigynandrum, 146. 

 Pteris, 135. 

 Pulse, 23. 

 Punctaria, 154. 

 Purple Cone-flower, 51. 

 Purslane, 17. 

 Pycnanthemum, 71. 

 Pylaisia, 146. 

 Pyrenula, 174. 

 Pyrola, 63. 

 Pyxine, 168. 



Quaking Grass, 130. 

 Queen of the Meadow, 46. 

 Quercus, 92. 

 Quick Grass, 133. 

 Quillwort, 139. 

 Quitch Grass, 133. 



Racomitrium, 142. 

 Radish, 10. 

 Radula, 150. 

 Ragweed, 51. 

 Ralfsia, 155. 

 Ramalina, 166. 

 Ranuneulaceae, 1. 

 Ranunculus, 2. 

 Raphanus, 10. 

 Raspberry, 32. 

 Rattle-box, 28. 

 Rattlesnake Grass, 130. 

 Rattlesnake Plantain, 103. 

 Rattlesnake-weed, 58. 



