A genus of plants known as water hemp or pigweed, belonging to the amaranth family.
From Greek 'a-' (without) and 'knide' (nettle), referring to plants that resemble nettles but lack their stinging properties. The term emerged in botanical classification during the Linnaean taxonomy period.
Acnida is a water plant that's actually an invasive species in many places—it grows in wet areas and looks harmless, but it competes aggressively with native plants and can clog waterways!
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