Solena species?- Pasighat, Arunachal Pradesh

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Please identify these plants 270916AS1 : 2 posts by 1 author. Attachments (1)
Some high school students came to me with many medicinal plants generally used in local medicines. They are given a project by the school on the said topic. out of the plants i have problem in correctly identifying these three plants. Hope somebody may be working on these plants.
Location – Pasighat, Arunachal Pradesh