'It may be mentioned that Nerlekar [in Phytotaxa 213(2): 155-158. 2015] merged this variety with var. nana having found no difference.
However, please look at the publication of Nerlekar (2015) as well as images of Jatropha nana in the EFI webpage. Here, in the typical variety, the capsules are broadly oblong while the fruits in var. bengalensis are suglobose. Hence I am maintaining this as a distinct variety on this fruit character as well as due to the disjunct distribution (var. nana in Maharashtra and var. bengalensis in West Bengal). My treatment will come out shortly.'
..... on that basis I found interest to communicate you personally, since I thought its your own opinion. To me still, it should keep in a varietal status (J.nana var. bengalense) since stipule characters may variable but we found typical paired stipules having 2-8 filiform branches of 1-11.5 mm (as compared with the 1-3 processes of upto 10mm length in J. nana var. nana: A.Nerlekar, 2015).
We, authors, after discussion and producing original specimen along with its photographs to respected Dr. T. Chakrabarty(BSI) and his Teacher, Dr.N.P. Balakrishnan and perusal of recent literature available on that Time( The Family Euphorbiaceae in India- A synopsis of its profile,taxonomy and bibliography, 2007) came to that conclusion to recognize it as a new variety. Here in this book of Euphorbiaceae, different species under the genus Jatropha have been keyed-out primarily on the basis of stipules present or absent (see key in this book mentioned).
Additionally we found, the tuberous main root is about 5-35cm (Mondal and Rahaman, 2015, New record of J. nana var. bengalense from Jharkhand, J.Non-Timber Forest Products,22:1) whereas Nerlekar(2015) mentioned that it is largest of 25cm. Nonetheless the disribution of J. nana var. bengalense, is LARGELY disjunct from the J.nana var. nana.
I appreciate the paper of Dr. Nerlekar, its really a good work. But he could provide more clear photographs of Stipules and root in his paper, which are lacking.
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