Clematis stem. Coloured scanning electron micrograph (SEM) of a section through a Clematis sp. stem. Within the central pith (dark green) are six vascular bundles (blue and yellow). Each vascular bundle consists of xylem (blue) and phloem (yellow) tissue. Xylem transports water and mineral nutrients from the roots throughout the plant and phloem transports carbohydrates and plant hormones around the plant. Around the pith is the cortex (brown), which consists of parenchyma cells. On the outside of the stem is the epidermis (bright green).

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