1) Asterid dicot genus 2) Genus layia 3) Tidytips and kin 
These are erect daisylike annual herbs with dark glandular stems. The flower heads usually contain white or yellow ray florets; some species have yellow florets tipped sharply in white which give the flowers their common name. The genus is named for naturalist George Tradescant Lay, who was one of the discoverers of Layia gaillardioides. The speci...
[n] - genus of western United States annuals with showy yellow or white flowers
genus Layia noun genus of western United States annuals with showy yellow or white flowers