Ceratophyllum demersum
 
Hornwort

Leaf Tooth and Apex

Wascana Creek, Regina
13-August-2019

Note the leaves are equipped with small, thorny teeth. There are also two small teeth at the apex of each branch.

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Ceratophyllaceae: 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 trees

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water plants; NOT [land plants]

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some or all leaves divided into filiform segments; NOT [leaves all simple]

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plants free-floating, rootless; NOT [plants rooted at the bottom]