Phylum: Magnoliophyta - Class: Equisetopsida - Order: Alismatales - Family: Hydrocharitaceae
This submerged perennial weed was imported from North America. It grows rapidly in favourable conditions and can choke shallow canals, ponds and the margins of some slow-flowing rivers.
Canadian Pondweed has tiny white or pale purple flowers between May and September.
Sue Parker's latest ebook is a revised and enlarged second edition of the acclaimed Wildflowers in the Algarve - an introductory guide. Full details here...
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