pyrethrum: white-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genus Chrysanthemum
vascular plant: green plant having a vascular system: ferns, gymnosperms, angiosperms
dotted gayfeather: herb with many stems bearing narrow slender wands of crowded rose-lavender flowers; central United States and Canada to Texas and northern Mexico