Biennial or perennial herb up to 1.5 m, with green or reddish stems and large yellow flowers.
Scientific name: Oenothera glazioviana Micheli.
Common name: Redsepal evening-primrose
Family: Onagraceae
Status in Portugal: Invasive species in more and more areas of the national territory.
Risk Assessment Score: 11 | Value obtained according to a protocol adapted from the Australian Weed Risk Assessment (Pheloung et al. 1999), by Morais et al. (2017), according to which values above 13 mean that the species has risk of having invasive behavior in the Portuguese territory | Updated on 30/09/2017.
Synonymy: Oenothera coronifera Renner, Oenothera fusiformis Munz & I.M. Johnst., Onagra erythrosepala Borbás, Onagra grandiflora (L’Hér.) Cockerell & Atkins
Last update: 30/10/2017
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Native distribution area
Originated by the spontaneous crossing of two North American species.
Distribution in Portugal
Mainland Portugal (Minho, Trás-os-Montes and Alto Douro, Douro Litoral, Beira Baixa, Beira Litoral, Ribatejo, and Algarve) and the Azores (Flores, Faial, Pico, Graciosa, São Jorge, Terceira, São Miguel, and Santa Maria islands).
For more detailed locations of this species, check the online interactive map. This map is still incomplete – we need your help! Contribute by submitting records of the location of the species where you can find it.
Geographical areas where there is a record of the presence of Oenothera glazioviana.
Other places where the species is invasive
Some species of Oenothera are invasive in Australia, New Zealand, South Africa, USA, Chile, and in several European countries.
Introduction reasons
For ornamental purposes.
Preferential invasion environments
It requires a certain degree of soil moisture, as well as nitrogen, so the habitats where it grows most often are disturbed and/or open, moist places (trail edges, river banks, fresh wasteland). It is found in both mid-mountain and basal areas, although it is more abundant on sandy or stony terrain near the coast.
