Strobilanthes heteromalla

Strobilanthes heteromalla is a large shrub in the family Acanthaceae, native to the Coonoor Ghat region of India. It is one of the species of Strobilanthes with a very long blooming cycle. It was seen flowering in 1850 and not again until 1886 leaving open the possibility of a 36-year cycle, but as Gamble notes three 12-year or two eighteen year cycles might have somehow gone unnoticed.
More recent studies have indicated a flowering interval of 14 years, compared to 12 years in the related Strobilanthes kunthiana.