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February 9, 2026Nordic Journal of Botany0 citationsOpen Access

Isoetes ×atruensis (Isoetaceae – Lycopodiopsida), a new interspecific sterile hybrid from Rajasthan of Western India

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SSS. K. SinghDBDaniel BruntonPSPradeep K. Shukla

Key Points

  • The aim is to identify and describe a new interspecific hybrid, Isoetes × atruensis, found in Rajasthan.
  • Identification of the hybrid based on morphological characteristics and ploidy level.
  • The hybrid is a triploid derived from I. coromandelina and I. rajasthanensis.
  • Field studies conducted in two separate locations in Rajasthan.
  • Isoetes × atruensis is characterized as a triploid (2n = 33 + 1) sterile hybrid.
  • The hybrid demonstrates morphological features that are intermediate to its parent species.
  • It is the second reported Isoetes hybrid from the Indian subcontinent, confirmed from multiple sites.

Abstract

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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Cite This Study

Singh et al. (2026) studied this question.

synapsesocial.com/papers/698979a6f0ec2af6756e775bhttps://doi.org/10.1002/njb.05068
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