Jatropha urens.

Botanical name: 

Jatropha urens Linn. Euphorbiaceae. Spurge Nettle. Tread-Softly.

Southern United States. This plant is called by the negroes tread-softly on account of its stinging hairs. The tuberous roots are said to be eatable like those of the cassava.

Sturtevant's Edible Plants of the World, 1919, was edited by U. P. Hedrick.