from
The Collaborative International Dictionary of English v.0.48
Calla \Cal"la\ (k[a^]l"l[.a]), n. [Linn[ae]us derived Calla fr.
Gr. ??????? a cock's wattles but cf. L. calla, calsa, name of
an unknown plant, and Gr. kalo`s beautiful.] (Bot.)
A genus of plants, of the order {Arace[ae]}.
[1913 Webster]
Note: The common {Calla} of cultivation is {Richardia
Africana}, belonging to another genus of the same
order. Its large spathe is pure white, surrounding a
fleshy spike, which is covered with minute apetalous
flowers.
[1913 Webster]