Commemorating Roldan Otumbensi (fl. 1825).
Perennial herbs, shrubs or small trees, glabrous to hairy. Stems erect or ascending, often blotched. Leaves along stems, alternate, large, margins entire, toothed or lobed, long-petiolate. Capitula radiate, diskiform or diskoid, terminal or axillary, in corymbs or panicles, with stalks. Involucral bracts in 1 row, equal, bracts often present at base of involucre. Receptacle flat. Outer florets female, ligulate, tubular or filiform, yellow or white. Inner florets bisexual, tubular, yellow. Achenes cylindrical, ribbed, hairy or glabrous. Pappus of fine, deciduous, barbed bristles.
One species has become weakly naturalised in Australia.
Large, often palmately veined, long-petiolate leaves; capitula in terminal and axillary corymbs or panicles.
About 55 species from Central 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.