The Probert Encyclopaedia of Nature

ARUM

Arum is a genus of plants of the natural order Aracese. Arum maculatum (the common wake-robin, or lords-and-ladies) is abundant in woods and hedges in England and Ireland. It has acrid properties, but its corm yields a starch, which is known by the name of Portland sago or arrow-root. At one time this was prepared to a considerable extent in Portland Island. All the species of this genus develop much heat during flowering.
Research Arum