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<p>This study documents the first record of <i>Heliotropium ovatum</i> (Wall. ex G.Don) Rueangs. &amp; Chantar. (Heliotropiaceae) from Dima Hasao district of Assam, northeastern India, representing a significant extension of the known distribution range of the species within the country. Previously, the species was known in India only from the Andaman &amp; Nicobar Islands, with unauthenticated report from Arunachal Pradesh now excluded by recent taxonomic revisions. Its known distribution outside India includes Myanmar and Thailand. This finding significantly extends the species' known range in India from Andaman &amp; Nicobar Islands to Assam and marks its first validated record in the Mainland India. A taxonomic description, photo-plate, phenology, habitat, and distribution of the species and an identification key to the species under the genus <i>Heliotropium</i> in Assam are provided. A new morphological feature i.e. presence of the tubercles on both surfaces of leaves is also documented.</p>

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Disjunct Distributional Record of Heliotropium ovatum (Heliotropiaceae) from Mainland India

  • 期刊论文

  • 发表日期：

    2026年4月23日

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  • Selim Mehmud,
  • Kangkan Kumar Das,
  • Debjyoti Bhattacharyya

摘要

This study documents the first record of Heliotropium ovatum (Wall. ex G.Don) Rueangs. & Chantar. (Heliotropiaceae) from Dima Hasao district of Assam, northeastern India, representing a significant extension of the known distribution range of the species within the country. Previously, the species was known in India only from the Andaman & Nicobar Islands, with unauthenticated report from Arunachal Pradesh now excluded by recent taxonomic revisions. Its known distribution outside India includes Myanmar and Thailand. This finding significantly extends the species' known range in India from Andaman & Nicobar Islands to Assam and marks its first validated record in the Mainland India. A taxonomic description, photo-plate, phenology, habitat, and distribution of the species and an identification key to the species under the genus Heliotropium in Assam are provided. A new morphological feature i.e. presence of the tubercles on both surfaces of leaves is also documented.