' 420 



Solanum nigrum, Linn. Deadly nightshade. 

 Solidago axillaris, Pursh. 



canadensis, Linn. Canadian golden rod. 



juncea, Alton. 



flexicaulis, Linn. 



lanceolata, Alton. 



nemoralis, Aiton. 



rigida, Linn. 



serotina, Aiton. Smooth golden rod. 

 Sonchus oleraceus v. aspera, Linn. Sow thistle. 

 Sparganium americanum, Nutt. Lake burr reed. 



ramosum, Smith. Burr reed. 

 Spartina cynosuroides, Ww. Spiked salt-grass. 

 Spergula arvensis, Linn. 

 Spiraea lobata, Jacquin. 



opulifolia, Linn. Nine bark. Hard hack. Snow ball. 



salicifolia, Linn. Willow hard hack. 



tomentosa, Linn. Steeple-bush. 

 Spiranthes cernua, Richard. Nodding ladies' tresses. 



gracilis, Beck. 

 Spiranthes tortilis, Richard. 

 Stachys aspera, Mx. Hedge-nettle. 



hyssopifolia, Mx. 

 Staphylea trifolia, Linn. 

 Stellaria longifolia, Muhl. 



media, Smith. Chickweed. . 

 Stipa avenacea, Linn. Feather-grass. 



juncea, Pursh. 

 Streptopus roseus, Mx. Rose bell-wort. 



T. 



Tephrosia'virginica, Persoon. Goat's rue. 

 Teucrium canadense, Linn. Wood sage. 

 Thalictrum cornuti. Hooker. 



dioicum, Linn. Meadow rue. 

 Thaspium barbinode, Nutt. 

 Thesium umbellatura, Muhl. False toad flax. 



