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Daisy disc floret, SEM
Disc floret. Coloured scanning electron micrograph (SEM) of a disc floret of a composite flower. Daisies (family Asteraceae, formerly Compositae) have inflorescences composed of two types of flowers. Disc florets such as this are found in the centre of the daisy. They are small, reproductive flowers with reduced petals and stalks. They are surrounded by larger, usually sterile, ray florets that act as guides to pollinating insects. Pollen (seen attached) is produced from stamens in the centre of disc floret. Once pollinated, the ovules of the disc florets develop into the seeds of the plant. Magnification: x250 when printed at 10cm wide., by STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY
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