After Christopher Encel, who published on galls in 1577.
Perennial herbs, subshrubs or shrubs. Stems erect, often much-branched. Leaves along stems, alternate, margins entire, toothed or lobed. Capitula radiate or diskoid, terminal, solitary or in panicles, with stalks. Involucral bracts in 2 or 3 rows, overlapping, slightly unequal. Receptacle with scales, convex. Ray florets sterile, ligulate or tubular, yellow. Disk florets bisexual, tubular, yellow or purplish. Achenes oblong to obovate, compressed, ciliate. Pappus of 1 or 2 short bristles or absent.
Usually yellow ray and disk florets; deciduous scales on receptacle.
About 15 species from N, C and S America.
Source: (2002). Dahlia. In: . Horticultural Flora of South-eastern Australia. Volume 4. Flowering plants. Dicotyledons. Part 3. The identification of garden and cultivated plants. University of New South Wales Press.