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Volume III (1980) - Flora of New Zealand Adventive Cyperaceous, Petalous & Spathaceous Monocotyledons
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Potamogeton suboblongus Hagstr.

P. suboblongus Hagström K. Svenska Vet. -Akad. Handl. 55, 1916, 182.

Leaves mostly floating, long- or short-petiolate, mostly broad-elliptic and subacute, longitudinal nerves (11)-13-21. Spike 1-2 cm long, dense. Achenes swollen, not obviously keeled, often reddish.

N., S., St. Swamps; sometimes in still pools

FL. 12-2. FT. 1-3.

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