Field horsetail, Equisetum arvense, Close up of Butterfly on a flowering stem.

Rose root, Rhodiola rosea, used in herbal medicine. Close up of single flower head, selective focus.

Rose root, Rhodiola rosea, used in herbal medicine. Close up of single flower head, selective focus.

Rose root, Rhodiola rosea, used in herbal medicine. Close up of flower heads, selective focus.

Rose root, Rhodiola rosea, used in herbal medicine. Close up of single flower head, selective focus.

Rose root, Rhodiola rosea, used in herbal medicine. Close up of flower heads, selective focus.

Rose root, Rhodiola rosea, used in herbal medicine. Close up of single flower head, selective focus.

Rose root, Rhodiola rosea, used in herbal medicine. Close up of single flower head, selective focus.

Rose root, Rhodiola rosea, used in herbal medicine. Close up of flower heads, selective focus.

Horsetail, Field horsetail, Equisetum arvense.

Angelica, Angelica archangelica.

Soft, purplish spike ofYorkshire fog grass, Holcus lanatus.