| Friday, January 4, 2008 |
| Extreme close-up of sunflower head in Istanbul, Turkey |
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posted by Flora Fun @ 6:35 AM   |
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| Sunflowers in Manila, Philippines |
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| posted by Flora Fun @ 6:35 AM |
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| Heliotropism |
Sunflowers in the bud stage exhibit heliotropism. At sunrise, the faces of most sunflowers are turned towards the east. Over the course of the day, they move to track the sun from east to west, while at night they return to an eastward orientation. This motion is performed by motor cells in the pulvinus, a flexible segment of the stem just below the bud. As the bud stage ends, the stem stiffens and the blooming stage is reached.
Sunflowers in the blooming stage are not heliotropic anymore. The stem has frozen, typically in an eastward orientation. The stem and leaves lose their green color.
The wild sunflower typically does not turn toward the sun; its flowering heads may face many directions when mature. However, the leaves typically exhibit some heliotropism. |
| posted by Flora Fun @ 6:35 AM |
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| Red sunflowers. |
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| posted by Flora Fun @ 6:34 AM |
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| A sunflower farm near Mysore, India. |
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| posted by Flora Fun @ 6:34 AM |
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| Other species |
The Jerusalem artichoke (Helianthus tuberosa) is related to the sunflower.
The Mexican sunflower is Tithonia rotundifolia.
False sunflower refers to plants of the genus Heliopsis. |
| posted by Flora Fun @ 6:34 AM |
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| Lone sunflower about 2 m (6 ft, 6') tall |
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| posted by Flora Fun @ 6:33 AM |
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