| Noun | 1. | genus Mertensia - a genus of herbs belonging to the family Boraginaceae that grow in temperate regions and have blue or purple flowers shaped like funnelsplant genus - a genus of plants borage family, Boraginaceae, family Boraginaceae - a widely distributed family of plants distinguished by circinate flowers and nutlike fruit Mertensia virginica, Virginia bluebell, Virginia cowslip - smooth erect herb of eastern North America having entire leaves and showy blue flowers that are pink in bud |