No. 14. 



FLOWERING PLANTS AND FERNS. 



537 



Polygonaceae 157, 437, 439 

 Polygonatum 123 

 biflorum 123 

 commutatum 123 

 giganteum 123 

 Polygonella 164 

 articulata 164 

 Polygonum 159, 441 

 acre 162 



var. leptostachyum 162 

 amphibium 161 



var. Hartwrightii 161 

 " terrestre 161 

 arifolium 163 

 aviculare 160 



var. littorale 160 

 " vegetum 160 

 Careyi 161 

 cilinode 163 



var. breve 163 

 " erectum 163 

 Convolvulus 163 

 crista turn 164 

 cuspidatum 164, 420 

 dumetorum 163 



forma cristatum 164 



var. scandens 163 

 emersum 161 

 erectum 160 

 exsertum 159 

 Hartwrightii 161 

 Hydropiper 162 

 hydropiperoides 162 

 incarnatiini 160 

 lapathifoHum 160 



var. incarnatum 160 

 " nodosum 420 

 littorale 160 

 maritimum 426 

 Muhlenbergii 161 

 orientale 162 

 pennsylvanicum 161 

 Persicaria 162 

 prolificum 159 

 punctatum 162 



var. leptostachyum 162 

 ramosissimum 160 



Polygonum 



forma atlanticum 160 

 var. prolHicum 159 



sachalinense 164 



sagittatum 163 



scandens 163 



tenue 160 



virginianum 163 



Zuccarinii 164 

 Polymnia 390 



canadensis 390 

 Polypodiaceae 17, 435 

 Polypodium 17 



vulgare 17 



var. cambricum 17 

 Polypody 17 

 Polypogon 65 



monspeliensis 65, 431 

 Polystichum 21 



acrostichoides 21 

 var. incisum 21 

 " Schweinitzii 21 



Braunii 424 

 Pond Lily 183 

 Pondweed 40 



Horned 44 

 Pondweed Family 40 

 Pontederia 113 



cordata 113 

 var. angustifolia 113 

 Pontederiaceae 113, 436 

 Poor Annie 118 

 Poor Man's Pepper 201 

 Poor Man's Weather Glass 317 

 Poor Robin 178 

 Poor Robin's Plantain 414 

 Poplar 141 



Balsam 142 



Black 143 



Downy 142 



Hickory 194 



Lombardy 143 



Necklace 142 



Silver-leaf 141 



Swamp 142 



Trembling 141 



Tulip 194 



