Yesterday I photographed fruits sold in Delhi under the name Kakrol, the fruits are turning yellow as they mature, almost rounded at the flower end (not gradually narrowed) and important definitely longer than 5 cm, 5-7 cm long.
I had earlier uploaded fruits of plant thought to be M. dioica
Tanay suggested M. cochinchinensis, but perhaps my showing him true link of M. cochinchinensis he retracted (I now think my plant is M. renigera)
In the same thread Balkar ji uploaded what looks like true M. dioica, with yellow flowers lacking dark corolla spots, smaller fruits (less than 5 cm long) distinctly narrowed towards flower end.
Surajit ji uploaded a nicely illustrated plant without fruits, with clearly dark spotted corolla which could identify it with M. cochinchinensis or M. renigera
Surajit backed it up with another upload with flowers and fruits in different stages, and after I photographed fresh fruits two days back, I feel Surajit's plant resembles mine from Delhi market sold as kakrol. My fruits are broadly ovoid (not gradually narrowed like M. dioica) and 5-7 cm long.
BOTH MY PLANT AS WELL AS ONE UPLOADED BY SURAJIT JI I FEEL IS M. RENIGERA NOW KNOWN AS M. SUBANGULATA SUBSP. RENIGERA
The same seems to true of plant uploaded by Vijayasankar ji as M. cochinchinensis is also M. subangulata subsp. renigera.
Perhaps you will agree with me if see real fruits of Gac fruit, M. cochinchinensis, with much larger fruits (10-15 cm in diam), yellow in colour finally turning red, with more spaced shorter but stronger spines.
PERHAPS SOON SOME MEMBER WILL FIND AND UPLOAD M. COCHINCHINENSIS, THE GAC FRUIT AND REMOVE THE CONFUSION OF APPLYING NAME KAKROL TO IT.
Dr. Gurcharan Singh
Retired Associate Professor
SGTB Khalsa College, University of Delhi, Delhi-110007
Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018.
Phone: 011-25518297 Mob: 9810359089