Stachys aspera, iv, 65.
Stanleya amplexifolia, v, 297.
Stillingia ligustrina, xlix, 129.
— oblongifolia, xlix, 128.
Streptopus maculatus, xlv, 170.
Sullivantia, characters of the genus, xlii, 22.
— —, ohioensis, xlii, 22.
Swertia deflexa, found in Maine, xxxii, 23.
Thalictrum clavatum, xlii, 17.
— debile, xlv, 175.