Paul Bertner / Riverweed (Macarenia clavigera), Rainbow River, Colombia
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Thomas Marent / Riverweed (Macarenia clavigera) in river, Cano Cristales, Sierra De La Macarena National Park, Meta, Colombia
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Thomas Marent / Riverweed (Macarenia clavigera) in river, Cano Cristales, Sierra De La Macarena National Park, Meta, Colombia
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Thomas Marent / Riverweed (Macarenia clavigera) in river with waterfall, Cano Cristales, Sierra De La Macarena National Park, Meta, Colombia
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Thomas Marent / Riverweed (Macarenia clavigera) in river, Cano Cristales, Sierra De La Macarena National Park, Meta, Colombia
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Thomas Marent / Riverweed (Macarenia clavigera) in river, Cano Cristales, Sierra De La Macarena National Park, Meta, Colombia
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Thomas Marent / Riverweed (Macarenia clavigera), Cano Cristales, Sierra De La Macarena National Park, Meta, Colombia
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Thomas Marent / Riverweed (Macarenia clavigera) in river with waterfall, Cano Cristales, Sierra De La Macarena National Park, Meta, Colombia
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Willem Kolvoort / Podostemaceae river weed (Mourera fluviatilis) flowers above water and Apinagia leaves underwater. Gran Rio, Suriname, September.
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Willem Kolvoort / The leaves of Podostemaceae river weed (Mourera fluviatilis) with endmeic fish (Moenkhausia surinamensis). Gran Dan rapid, Gran Rio, Suriname, September.
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Willem Kolvoort / Flower of Podostemaceae river weed (Mourera fluviatilis). Gran Dan, Gran Rio, Suriname, September.
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Willem Kolvoort / Podostemaceae river weed (Mourera fluviatilis) flower spikes above water, growing from a river-bed attachment. The flowering happens in the wet season. Gran Dan, Gran Rio, Suriname, September.
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Willem Kolvoort / Decayed leaf of Podostemaceae river weed (Mourera fluviatilis). Awadan rapids, Gran Rio, Suriname, September.
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Willem Kolvoort / Decayed leaf of Podostemaceae river weed (Mourera fluviatilis). Awadan rapids, Gran Rio, Suriname, September.
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Willem Kolvoort / Podostemaceae river weed (Mourera fluviatilis), close up of leaf structures. Awadan rapids, Gran Rio, Suriname, September.
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Willem Kolvoort / Podostemaceae river weed (Mourera fluviatilis), close up of leaf structures. Awadan rapids, Gran Rio, Suriname, September.
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Willem Kolvoort / Apinagia (Podostemaceae) flowering in river water. Peti rapids, Gran Rio, Suriname, September.
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Willem Kolvoort / Apinagia (Podostemaceae) close-up of leaves underwater. Peti rapids, Gran Rio, Suriname, September.
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Willem Kolvoort / Apinagia (Podostemaceae) seen underwater. Peti rapids, Gran Rio, Suriname, September.
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Willem Kolvoort / Apinagia (Podostemaceae) seen in split-level shot. Peti rapids, Gran Rio, Suriname, September.
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Willem Kolvoort / Apinagia (Podostemaceae) in flower. Peti rapids, Gran Rio, Suriname, September.
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Willem Kolvoort / Apinagia (Podostemaceae) in flowing river water. Peti rapids, Gran Rio, Suriname, September.
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Willem Kolvoort / Apinagia (Podostemaceae) in flowing river water. Peti rapids, Gran Rio, Suriname, September.
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Paul Bertner / Riverweed (Macarenia clavigera) in river, Rainbow River, Colombia
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Paul Bertner / Riverweed (Macarenia clavigera) in river, Colombia
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Thomas Marent / Riverweed (Macarenia clavigera) in river, Cano Cristales, Sierra De La Macarena National Park, Meta, Colombia
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Thomas Marent / Riverweed (Macarenia clavigera) and giant's kettle in river, Cano Cristales, Sierra De La Macarena National Park, Meta, Colombia
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Thomas Marent / Riverweed (Macarenia clavigera), Cano Cristales, Sierra De La Macarena National Park, Meta, Colombia
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Thomas Marent / Riverweed (Macarenia clavigera), Cano Cristales, Sierra De La Macarena National Park, Meta, Colombia
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Thomas Marent / Riverweed (Macarenia clavigera) in river, Cano Cristales, Sierra De La Macarena National Park, Meta, Colombia
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Thomas Marent / Riverweed (Macarenia clavigera) in river, Cano Cristales, Sierra De La Macarena National Park, Meta, Colombia