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<p><i>Nepenthes siamensis,</i> a new species from Khlong Phanom National Park in southern Thailand, is described. This species, closely related to others in section <i>Montanae</i>, stands out due to its distinct inflorescence characteristics, including bracts present on both male and female flowers, and unique pitcher morphology. It is found approximately 650 km north of the most similar species based on morphological comparison, <i>N. sanguinea</i> and <i>N. thai</i>, which are also both terrestrial and lower montane. It shares characters with them, such as a climbing habit and oblong to subspathulate leaves with 2 – 3 longitudinal nerves on each side of the midrib. This discovery significantly extends the known range of section <i>Montanae</i>.</p>

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Nepenthes siamensis (Nepenthaceae), a new species of section Montanae from Surat Thani Province, Peninsular Thailand

  • 期刊论文

  • 发表日期：

    2026年2月27日

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  • Sunya Nuanlaong,
  • Chayan Yodthammarat,
  • Purin Chiwan,
  • Teerayut Laewan,
  • Suphansiri Pohsap

摘要

Nepenthes siamensis, a new species from Khlong Phanom National Park in southern Thailand, is described. This species, closely related to others in section Montanae, stands out due to its distinct inflorescence characteristics, including bracts present on both male and female flowers, and unique pitcher morphology. It is found approximately 650 km north of the most similar species based on morphological comparison, N. sanguinea and N. thai, which are also both terrestrial and lower montane. It shares characters with them, such as a climbing habit and oblong to subspathulate leaves with 2 – 3 longitudinal nerves on each side of the midrib. This discovery significantly extends the known range of section Montanae.