(used with a singular or plural verb) any of several plants belonging to the genus Trichostema, of the mint family, having blue to pink or, rarely, white flowers with long, curved filaments.
selfheal (def 1).
Woodland Tales Ernest Seton-Thompson
a bushy, composite shrub, Felicia amelloides, of southern Africa, having solitary, daisylike flowers with yellow disks and blue rays, grown as an ornamental.
chicory (def 1).
a tropical American vine, Ipomoea acuminata, of the morning glory family, having large, funnel-shaped flowers that turn from blue to pink.