20.9 MB (9.6 MB compressed)
2236 x 3265 pixels
19.0 x 27.7 cm ⏐ 7.5 x 10.9 in (300dpi)
TED KINSMAN / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY TED KINSMAN / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY
A scanning electron microscope image of the football shaped bract of the female cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant. This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defences keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
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