Calla
(from kallos, beauty). SYN. Provenzalia. ORD. Aroideae (Araceae). A monotypic genus. The species is a native of Central and Northern Europe and North America, has creeping or floating stems, and cordate entire leaves. C. palustris is sometimes grown in collections of aquatics or bog plants; and, although, perhaps, hardly worth cultivating as a pot plant, is well worth a place in open ornamental waters. Richardia Africana is frequently erroneously called Calla aethiopica.
C. palustris (marsh). fl., spadix protected by a flat white spathe, upper ones female, lower hermaphrodite, with numerous thread-like stamens. l. stalked, emerging from a sheath. h. 6in. Hardy aquatic, naturalised here and there in Britain.