Dittrichia Greuter
Annual or perennial herbs. Lvs alternate, simple, entire or toothed. Capitula solitary. Involucral bracts in 3-5 rows, imbricate, with erect lamina, the outer usually herbaceous, the inner membranous. Receptacle flat or slightly convex; scales O. Outer florets ♀, ligulate; ligules yellow. Inner florets ⚥, tubular. Achenes all similar, slightly 4-angled, abruptly constricted below apex; pappus hairs in 1 row, narrow at apex.
2 spp., Canary Is, Mediterranean area to N.W. India. Naturalised sp. 1.
Dittrichia is sometimes included within Inula but is distinguished by the smaller capitula, and the constricted apex of the achenes.
