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Researchers identify a new sterile aquatic hybrid, Isoetes × atruensis, in Rajasthan, suggesting biodiversity in hybrids.
Isoetes × atruensis hyb. nov. is shown to be a triploid (2 n = 3× = 33 + 1) sterile interspecific hybrid between diploid (2 n = 2× = 22 + 1) I. coromandelina and tetraploid (2 n = 4× = 44 + 1) I. rajasthanensis . It has been found in two locations in Rajasthan, India. It is a perennial, shallow‐water aquatic best distinguished by a set of morphological characteristics and a ploidy level that is intermediate between its putative parents. Isoetes × atruensis is the second Isoetes hybrid taxon reported from the Indian subcontinent and the first to be confirmed from multiple locations on the subcontinent.
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Singh et al. (2026) studied this question.
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