Early 19th century; earliest use found in William George Maton (1774–1835), physician. From arrow + leaf, so called on account of its arrowhead-shaped leaves.
Definition of arrowleaf in US English:
arrowleaf
nounˈarə(ʊ)liːf
North American. Arrowhead (genus Sagittaria).
Origin
Early 19th century; earliest use found in William George Maton (1774–1835), physician. From arrow + leaf, so called on account of its arrowhead-shaped leaves.