buffalo clover

(noun) low-growing annual herb of southwestern United States (Texas) having silky foliage and blue flowers; a leading cause of livestock poisoning in the southwestern United States. Synonyms: bluebonnet, buffalo clover, Texas bluebonnet, Lupinus subcarnosus.

(noun) clover of western United States. Synonyms: buffalo clover, Trifolium reflexum, Trifolium stoloniferum.