Zosteraceae

Marine plants; leaves never almost pinnatifid.; flowers in flat. spikes Zosteraceae

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Erect flowering and vegetative stems both with elongated internodes. Rhizome and stem with 4 or more cortical bundles near the middle (in cross-section) Heterozostera

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Only the erect flowering stems with elongated internodes; no such vegetative stems present. Rhizome and stem with 2 cortical bundles near the middle (in cross-section) Zostera