55.2 MB (4.2 MB compressed)
5071 x 3803 pixels
42.9 x 32.3 cm ⏐ 16.9 x 12.7 in (300dpi)
DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Garden cosmos flower bud. Light micrograph of a section through a flower bud from a garden cosmos (Cosmos bipinnatus) plant. The bottom triangular tissue of the flower stem is a circular receptacle made up of parenchyma cells (light blue) with veins (dark-blue). The flower head is enclosed by an outer involucre of 8 bracts. The top of the receptacle is covered by masses of small flowers (florets), with bracts around them, the capitulum. Each floret has a bract at the base and a flask-shaped ovary (blue), inside which is the ovule (purple). At the top of the ovary is the long tubular corolla (blue) made up of five toothed-petals. The stamens spring from the corolla tube and the five anthers are fused together at the top of the corolla. Each anther has.
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