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Photos from MNS Botany-walk at FtWhyteCentre with George Holland & Richard Staniforth on 2003jul17:
Shitweed=False ragweed?: or GiantRagweed? or CowParsnip? Wood duck: female Wood duck: duckling amid duckweed group-2003: examining duckweed Lesser duckweed=Lemna minor: the 2nd smallest flowering plant Canadian pondweed=Elodea canadensis: Clasping-leaf pondweed=Potamogeton perfoliatus: