the buffalo pea, Astragalus crassicarpus, a wild pea having yellow blossoms and a pod that is red and fleshy at first, becoming hard and brownish when dry.
See also: buffalo bean
- 1887  "There is a product of the North-West called the buffalo apple or buffalo fruit: is that [the wild turnip] it?" "No, that is a sort of plum which grows on the prairie on a vine."