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St. John's-wort [F] (Hypericum)
[F] = May cause a phototoxic reaction if the skin is exposed first to the sap and then to sunlight. Photodermatitis, or phytophotodermatitis, is manifested as redness, blistering, and burning of the skin. Skin exposed to the sap should be washed with soap and water. Symptoms can be avoided by protecting the skin from sunlight for at least 48 hours. Skin symptoms may be severe and require medical attention.
Stinging nettle (Urtica)
The plant causes local irritation. The plant fluid, or sap, can cause local irritation symptoms, such as stinging and burning at the exposure site. Does not absorb into the body. Rinse the exposed area with water.
Stock (Matthiola)
The plant is non-toxic.
Stone bramble (Rubus saxatilis)
The plant is non-toxic.
Stonecrop (Sedum)
The plant is non-toxic.
Goldmoss stonecrop (Sedum acre) may cause dermatitis.
Strawberry groundcherry (Physalis pruinosa)
The plant is toxic, but ingesting a small amount rarely causes symptoms. Ripe berries are non-toxic.
Strawflower, Everlasting flower (Helichrysum)
The plant is non-toxic.
Styrofoam
Styrofoam is not toxic when ingested, but may cause suffocation if the swallowed pieces are large.
Sundew (Drosera)
The plant is non-toxic.
Swallow-wort, White swallow-wort (Cynanchym vincetoxicum)
The plant is toxic, but ingesting a small amount rarely causes symptoms.