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. 2020 Jun 25;11:718. doi: 10.3389/fpls.2020.00718

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Copyright © 2020 Punja and Holmes.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Flower and pollen development in genetically male plants of Cannabis sativa. (A–C) Male flowers formed in clusters at leaf axils. Each flower is pedicillate, with individual stalks. (D–F) Opening of male flowers to reveal 5 green-white tepals which expose 5 stamens each attached to a filament that dangles the anther. (G) Large amounts of pollen (arrow) being released through the longitudinal groove (stomium) of the anther. (H) Enlarged view of the stomium showing formation of bulbous trichomes (arrow) forming in the groove of the anther. (I) Close-up of a trichome with a short stalk (arrow). Pollen grains can be seen in the foreground.