Abstract
The taxonomic revision of the genus Derris Lour. in India is a preliminary step towards the revision of the tribe Dalbergieae of the order Leguminosae . The tribe is represented in India by the following genera- Dalbergia, Pterocarpus, Pongamia, Derris and Euchresta . Twenty five species of Derris are described in this paper which include 2 species ( Derris pseudo-robusta, D. macrocarpa ), 3 varieties ( D. rohusta Benth. var. assamica , D. cuneifolia Benth. var. longipedicellata , D. elliptica Benth. var. chittagongensis ) and 2 forms ( D. elegans Benth. f. andamanensis , D. cuneifolia Benth. f. assamica ) described for the first time. Derris heyneana Benth. var. paniculata Baker is raised to the status of a species with a new name D. bakeri while D. eualata Bedd. and D. wallichii Prain are reduced to varieties of D. thyrsiflora Benth. ( D. thyrsiflora Benth. var. eualata . D. thyrsiflora Benth. var. wallichii ). The nomenclature of Derris laxiflora Haines is changed, the correct name being D. hainesiana . D. thyrsiflora Benth. is reported for the first time from the Andaman Islands.
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