Shrub or subshrub to 1 m tall, glandular-hairy. Stems erect, branched above. Leaves elliptic to oblanceolate, to 10 cm long, to 2 cm wide, margins entire to coarsely toothed, decreasing in size up the stem. Capitula solitary or in loose corymbs, to 3 cm across; autumn to early summer. Ray florets white above, indigo, often with a white margin below. Disk florets bright blue. Achenes about 7 mm long, 3-angled, narrowly winged. [Dimorphotheca ecklonis DC.]
This appears to be the most commonly cultivated species and is available as a range of cultivars and seed mixes. Most cultivars in Osteospermum appear to be hybrids and are available in a range of different heights and flower colours.
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.