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Stuckenia
See list of 2 species in this genus-
1a. Stipular sheaths open with overlapping edges; leaf blades commonly acute at the apex, with an apiculus on young plants; stigma borne on a short style, the style persistent on the achene and forming a tiny beak on mature drupes; drupes 3–4.5 mm long
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1b. Stipular sheaths closed; leaf blades commonly blunt to obtuse at the apex, sometimes retuse, rarely apiculate; stigma broad and sessile, not forming a beak on mature drupes; drupes 2–3 mm long
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Each photo represents one species in this genus.