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Fabaceae-Faboideae  family

Crotalaria zanzibarica
Bentham
, London J. of Bot. 2: 584. 1843.

Naturalized very rare herb of shady moist coastal spots.
Native to east Africa.  
I have seen this species twice but not for the last 10 years. Probably a waif.
Leaflets narrow compared to Crotalaria pallida