well you already brought up the interspecific cross thing. This paper sites an indian lab but the better citation is:
A weird wrench in this theory is some phylogenetic evidence that the indian super-hots split before the frutescens-chinense split. This discovery was published in 2012 and the same group submitted the new species name assamicum that same year.
- Bosland, P.W. and J.B. Baral. 2007. ‘Bhut Jolokia’—The World's Hottest Known Chile Pepper is a Putative Naturally Occurring Interspecific Hybrid. HortScience 42: 222-224
- http://hortsci.ashspublications.org/content/42/2/222.full
A weird wrench in this theory is some phylogenetic evidence that the indian super-hots split before the frutescens-chinense split. This discovery was published in 2012 and the same group submitted the new species name assamicum that same year.
- Purkayastha, J., S.I. Alam, H.K. Gogoi and L. Singh. 2012. Capsicum assamicum sp. nov.(Solanaceae), from Assam, northeastern India. Ozean J. Appl. Sci. 5: 55-66.
- Purkayastha, J., S.I. Alam, H.K. Gogoi, L. Singh and V. Veer. 2012. Molecular characterization of 'Bhut Jolokia' the hottest chilli. J Biosci 37: 757-768. doi:10.1007/s12038-012-9249-8.
- Verma, P.K., K.K. Rawat, N. Das and B. Pradhan. 2013. A botanical enigma of India’s hottest chilli Bhoot Jolokia (Capsicum chinense Jacq). New York Science Journal 6: 49-51.
- Bosland, P.W., D. Coon and P.H. Cooke. 2015. Novel Formation of Ectopic (Nonplacental) Capsaicinoid Secreting Vesicles on Fruit Walls Explains the Morphological Mechanism for Super-hot Chile Peppers. Journal of the American Society for Horticultural Science 140: 253-256.