Photo: Pelargonium tetragonum 2.

Leaf and stems. Brussels bot.g., Belgium. Greenhouse. 2008-06-05.
Pelargonium tetragonum (L. f.) L'Hér. Engl.: square-stack cranesbill, square-stem pelargonium. Sven.: fyrkantspelargon. Bot. syn.: Geranium tetragonum L. f.
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Photo: Pelargonium tetragonum 2.