Humulus lupulus
 
Common Hop

Staminate Flower Top

Shore of Red Deer River near Hudson Bay, SK
24-July-2018

There are five sepals and no petals. The anther is composed of two thecae, each theca containing two pollen sacs.  The pollen is released through an expanding pore which first erupts distally and then expands proximally and longitudinally along the boundary between the two pollen sacs.  Thus the anthers dehisce basipetally and longitudinally.  The line of dehiscence is called the stomium. Note the golden glands along the boundary between the two thecae.

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Cannabinaceae: Answers to key questions in Budd's Flora leading to this family. 
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herbs; NOT [shrubs or trees]

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plants not parasitic on branches of trees, rooted in soil or water

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land plants; NOT [water plants]

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plants twining, climbing

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plants without milky sap

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stamens or pistils in separate flowers on the same plant; NOT [stamens and pistils in each flower]

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flowers with only one floral ring, with sepals but not petals

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female flowers and fruit in catkin-like spikes