Rosemary (Rosmarinus officinalis). Coloured scanning electron micrograph (SEM) of the stem of a rosemary plant, showing hairs (white) that help reduce water loss. This perennial herb is used in herbal medicine to treat headaches and colds. It is also used as a tonic and as a food flavouring. Magnification: x110 when printed 10 centimetres high.
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