Seeds of Sunflower (Helianthus annuus)
Numéro d’image : 12582275
| Seeds of sunflower (Helianthus annuus) family Asteraceae. The picture shows the edge of a sunflower that is developing seeds. A sunflower is a composite inflorescence, consisting of hundreds of florets; the yellow petals"" (not present here) are, correctly, ligules produced by ray florets at the edge of the inflorescence. The green tissues, picture bottom, are bracts. The seeds appear aligned into spirals that curve either to the left or right. In this picture, the effect is most clearly seen in rows that run from top left to bottom right. This pattern has intrigued mathematicians for centuries. It arises from the early development of the individual florets at the tip of the plant stem, where, in common with the leaves of many plants, they arise in a spiral pattern around the stem apex The radial distance between the floret initials is the so-called Golden angle of 137.5 degrees." | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Burgess, Dr. Jeremy |
| Taille de l’image : | 3468 px × 5212 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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