Shrub to 2.5 m tall. Leaves to about 10 cm long, 5 cm wide, elliptic to oblong or ovate, 8-10-veined, base cordate. Flowers in few-flowered clusters, with the flower tubes 2.5-3.5 cm long, mostly pink, yellow, orange or red.

S India, tropical Asia

 

I. chinensis from China and Taiwan needs revision but is available and has, among others, the listed cultivars 'Alba' and 'Rosea'. This species has leaves to about 6 cm long with tapered bases and flowers in dense clusters. I. klanderiana and I. williamsii are also listed.

Source: Spencer, R. (2002). Rubiaceae. In: Spencer, R.. 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.