Solanum nigrum
Solidago nova boracensis, rigida, virga aurea and others.
Sonchus sp.
Sophora fl. purple
Spigelia marilandica
Spiræa aruncus, apulifolia, stipulaica, tomentosa and trifoliata
Staphylæa trifoliata
Stellaria sp.
Styrax sp.
Sylphium N. S.