File:Cephalocereus senilis (3779515730).jpg
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Summary
[edit]DescriptionCephalocereus senilis (3779515730).jpg |
Old Man Cactus. Next to it is an Echinocactus grusonii. From Wikipedia - Cephalocereus senilis (Old Man Cactus) is a species of cactus native to Guanajuato and Hidalgo in eastern Mexico. It is threatened in the wild, but widespread propagation and popularity in cultivation have reduced the demand on wild populations. It is a tall columnar species with clusters of stems, growing to 5-15 m tall; the individual stems are usually unbranched, being unable to withstand the weight of side branches easily (Mauseth Research). The most striking feature is the long, white hairs it possesses, which serve to protect it from the sun. The coat of hair makes many plants appear almost snow-white (however, the hairs conceal numerous sharp yellow spines). It is in reference to the shaggy white coat that the popular name 'Old Man Cactus' developed. At the young stage the cactus has silvery-white hairs, which are later lost as the plant grows. The flowers are red, yellow, or white, though it may not flower until 10-20 years old. Cultivation Cephalocereus senilis is a very popular cactus in cultivation, grown for its woolly appearance. It prefers a very well-drained soil mix (more so than many other cacti), and lots of bright sunlight, which encourages growth of the hair. |
Date | |
Source | Cephalocereus senilis |
Author | Leonora Enking from West Sussex, England |
Camera location | 50° 49′ 41.04″ N, 0° 28′ 25.22″ W | View this and other nearby images on: OpenStreetMap | 50.828066; -0.473672 |
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This image was originally posted to Flickr by wallygrom at https://flickr.com/photos/33037982@N04/3779515730. It was reviewed on 3 March 2016 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-sa-2.0. |
3 March 2016
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current | 00:31, 3 March 2016 | 480 × 640 (132 KB) | Josve05a (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot SX200 IS |
Exposure time | 1/200 sec (0.005) |
F-number | f/3.4 |
ISO speed rating | 160 |
Date and time of data generation | 14:48, 1 August 2009 |
Lens focal length | 5 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
File change date and time | 14:48, 1 August 2009 |
Y and C positioning | Centered |
Exif version | 2.2 |
Date and time of digitizing | 14:48, 1 August 2009 |
Meaning of each component |
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APEX shutter speed | 7.65625 |
APEX aperture | 3.53125 |
APEX exposure bias | 0 |
Flash | Flash did not fire, auto mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,393.442622951 |
Focal plane Y resolution | 16,393.442622951 |
Focal plane resolution unit | inches |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |