For Cassia
Irwin, H.S., and R.C. Barneby. 1982. The American Cassiinae: a synoptical revision of Leguminosae tribe Cassieae subtribe Cassiinae in the New World. Memoirs N.Y. Bot. Gard. 35: 1-918.
Isely, D. 1975. Leguminosae of the United States. II. Subfamily Caesalpinioideae. Memoirs N.Y. Bot. Gard. 25: 1-228.
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