Humulus lupulus
 
Common Hop

Staminate Flower Bottom

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

There are five sepals and no petals.

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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