Ranger's button (Sphenosciadium capitellatum) is an upright perennial herb of the Carrot (Apiaceae) plant family. It is a flowering plant that is native to western North America, growing in moist areas such as streambanks, wetlands, wet meadows, as well as forests often at high elevations. Ranger's buttons has numerous compact clusters of tiny white or purple-tinged flowers (umbels), resembling fuzzy buttons protruding out from separate hairy branches.
All parts of Ranger's button are toxic to all livestock. It is known to cause photosensitivity if brushed up against.