This paper presents a floristic survey of Caesalpinioideae in Serra do Japi, located in the southeastern of São Paulo state. Eighteen species belonging to nine genera and four tribes were inventoried. Senna (6 spp.) and Chamaecrista (4 spp.) were the most diverse genera and Cassieae (11 spp.) the most representative tribe. Nine new records for the area have been recognized. The species found have wide distribution in the phytogeographic areas of the country, except two exclusive species of the Atlantic Forest. The flora in Serra do Japi holds around 20% of the species of Caesalpinioideae registered in the State, reinforcing the importance of the conservation of this forest as an important pole of diversity. Identification keys, illustrations and comments about the species are presented.
Fabaceae; floristic; seasonal forest; legumes; taxonomy
