Report of the Commissioner of Patents for 1859 p. 329
Plants used as food by Man
Dr. F. Unger

We may mention here a few other plants, such as the Evening Primrose, Gartenrapunzel or Rapontik (Oenothera biennis, L.), from Virginia, and Oenothera grandiflora, Ait., likewise from North America, which are occasionally sought after on account of their sweet turnip-like roots, which they acquire by cultivation. Oenothera suaveolens, Desf., Oenothera parviflora, L., and Oenothera muricata, L., likewise from North America, also furnish edible roots. All these plants, like the parsnip and the carrot, have laid aside very little of their original nature.