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Silphium perfoliatum var. perfoliatum, Sinapis, Sinapis alba, Sinapis arvensis, Sisymbrium, Sisymbrium altissimum, Sisymbrium irio, Sisymbrium loeselii, Sisymbrium orientale, Sisymbrium polyceratium, Sisyrinchium, Smilax, Smilax bona-nox, Smilax herbacea, Smilax laurifolia, Smilax pseudochina, Smilax rotundifolia, Smilax tamnoides, Solidago, Solidago altissima, Solidago altissima subsp. altissima, Solidago bicolor, Solidago caesia, Solidago caesia var. caesia, Solidago canadensis, Solidago canadensis var. canadensis, Solidago flexicaulis, Solidago rigida, Solidago rigida subsp. rigida, Solidago sect. Solidago, Solidago sempervirens, Solidago sempervirens subsp. sempervirens, Sonchus, Sonchus arvensis, Sonchus arvensis subsp. arvensis, Sonchus oleraceus, Sonchus palustris, Sonchus tenerrimus, Sorbus, Sorbus aucuparia, Sorbus hybrida, Sorbus sect. Sorbus, Sorbus subg. Sorbus, Sparganium, Sparganium natans, Spergula, Spergula arvensis, Spergula pentandra, Sphagnum, Sphagnum palustre