A vascular leaf that is slender and coiling and lacks a lamina. [source: ISBN:9780881928501]
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Aids plant in climbing. A leaf tendril will usually have a bud or shoot axis in its axil. See also leaflet tendril (PO:0025362), leaf apex tendril (PO:0025363), branch tendril (PO:0025364), stem apex tendril (PO:0025365), leaf rachis tendril (PO:0025366), and prophyll tendril (PO:0025367). Careful observation is required to correctly classify some tendrils.