Greek asystasia— confusion, origin uncertain.
Perennial herbs or evergreen shrubs. Leaves opposite, simple, thin. Flowers in axillary or terminal clusters, each with a small bract. Sepals 5, narrow, united at the base. Flowers tubular to funnel-shaped, sometimes swollen. Stamens 4, in unequal pairs. Fruit a 2-4-seeded capsule narrowed at the base.
Asystasia bella is now referred to Mackaya bella.
Scrambling plant; flowers 5-lobed; stamens 4, in unequal pairs.
About 70 species, mostly from the Old World tropics and subtropics.
Source: (2002). Acanthaceae. 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.