Equisetum arvense L. (As per efi thread: Subsp. arvense is confined to high, semi-dry inner Himalayan areas and becomes progressively rarer eastwards – finally dying out eastwards in Nepal. It is not known in West Bengal, or Sikkim, nor Bhutan or Arunachal Pradesh. Subsp. diffusum on the other hand – the common N. Indian taxon – is in the outer Himalaya to […]
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