Calla palustris
English: Calla; Bog arum; Marsh calla; Wild calla; Squaw claw; Water-arum.
Synonyms: Aroides; Provenzalia; Callaion; Callaion palustris; Calla ovatifolia; Calla cordifolia; Callaion bispatha; Callaion brevis; Callaion heterophylla; Provenzalia bispatha; Dracunculus paludosus; Calla generalis; Calla brevis
Genus: 1 species.
Region: cool temperate regions of the Northern Hemisphere, Europe, northern Asia, northern North America, Alaska, Canada.
Habitat: bogs, ponds.
Use: rhizome is edible after drying, grinding, leaching and boiling; very poisonous when fresh due to its high oxalic acid content
Botany
Herb; rrhizomatous; perennial.
Leaves: rounded to heart-shaped, ± 10 cm long petiole, ± 8 cm broad, with a ±c 15 cm petiole.
Inflorescence: greenish-yellow spadix; ± 5 cm long, enclosed in a white spathe.
Fruit: cluster of red berries, each berry containing several seeds.
Taxonomy
The genus formerly also included a number of other species, which have now been transferred to the separate genus Zantedeschia, which are still often termed "calla lilies".