From the classical Greek name for a similar everlasting daisy.
Perennial herbs or shrubs, more or less erect. Leaves along stems, alternate, entire, woolly. Capitula diskiform, terminal, in flat-topped corymbs, of 2 types: either mostly female with a few male florets; or mostly male with a few outer female florets. Involucral bracts in several overlapping rows, unequal, usually white. Receptacle flat to convex. Outer florets female, filiform, yellow. Inner florets functionally male, tubular, yellow. Achenes oblong or linear, sparsely hairy. Pappus of free barbed bristles.
Usually white involucral bracts; 2 types of capitula; entire woolly leaves.
About 110 species from Asia and N America.
Source: (2002). Asteraceae. 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.