DCHP-1 Online
loco ((1)) 1 † [< Am.E < Sp. "crazy"] West 
n. a weed, Oxytropis sericea, poisonous to grazing animals.
See also: locoweed
- 1919 "If Slimy Red got wise to anything he'd slip him a twig of locoe or put a sponge up his nose."
- 1958 Evidently we had moved onto a loco range.
- 1919 "If Slimy Red got wise to anything he'd slip him a twig of locoe or put a sponge up his nose."