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The leaf surface can be smooth, variously wrinkled, ridged or hairy.
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Smooth: no obvious surface ornamentation, smooth to touch. |
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Pleated: the leaf surface is folded longitudinally in pleats (plicate). |
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Roughened ridges: the leaf surface is irregularly raised into roughened ridges. |
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Grooved/furrowed/chanelled: the leaf surface has obvious grooves or channels, usually running longitudinally (sulcate). |
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Warty: the leaf surface has irregular lumps resembling warts (verrucose). |
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Hairy: the leaf surface is covered with hairs. |