This member of the Sterculiaceae* family was given this name by William Franklin Wight in 1909. It is found in China, Bangladesh, Japan, Taiwan and Vietnam, growing in a drained soil with quite some water and some to lots of sun. The caudex can grow to 35 centimetres in diameter, the entire plant to 16 metres in height. The flowers are light greenish yellow.
The genera name in honour of Joseph von Firmian, 18th century Imperial Governor of Lombardy.
The species name meaning 'unbranched'.

