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Updated: June 9, 2025
Attempts, however, to produce it by crossing of other forms have not succeeded, and a specimen has been discovered at the Museum d'Histoire Naturelle at Paris, collected by Michaux in North America about 1796, which agrees exactly with the Oenothera Lamarckiana naturalised or cultivated in Europe.
Since that time, however, the natural distribution and the cultural history of Oenothera has been very thoroughly worked out. Oenothera Lamarckiana is the common Evening Primrose of English gardens.
Following this line backward or downward we reach another apparent mutation-period, which includes the origin of the group called Oenothera, with a large number of species of the same general type as the Onagra-forms, Still farther downward comes the old genus Oenothera itself, with numerous subgenera diverging in sundry characters and directions.
Thus true and constant cruciate varieties have been produced from accidentally observed initial plants, and because of their very curious characters they will no doubt be kept in botanical gardens, even if they should eventually become lost in their native localities. At this point I might note another observation made on the wild species of Oenothera cruciata from the Adirondacks.
One other inconstant new species is to be noted, but as it was very rare both in the field and in my cultures, and as it was difficult of cultivation, little can as yet be said about it. It is the Oenothera elliptica, with narrow elliptical leaves and also with elliptical petals. It repeats its type only in a very small proportion of its seed.
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