Asystasia alba is a species of tropical herb in the Acanthaceae family. It is endemic to Christmas Island, an Australian territory in the north-eastern Indian Ocean. Its specific epithet comes from the Latin alba (white), referring to the colour of its flowers.
Asystasia alba is an erect woody herb, growing to 0.5–0.75 m in height. Its 30–140 mm long leaves are ovate, acuminate or acute, pale green in colour and usually bristly when young. The inflorescence is 60–80 mm long, the flowers single or occasionally paired, the bracts and bracteoles about 2 mm long and the pedicels 1.5–3 mm long. The corolla is white or violet, and the tube 14–18 mm long. The capsule is usually 2-seeded and about 26 mm long. The seeds are 4 mm long.
Distribution and habitat
- Ridley (1906).
- Flora of Australia Online.
- Ridley, H.N. (1906). Journal of the Straits Branch of the Royal Asiatic Society. 45: 209. Missing or empty
- "Asystasia alba Ridl.". Flora of Australia Online. Australian Biological Resources Study. 1993. Retrieved 2010-11-25.
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