Easily confused with : other
Evening-primroses (Oenothera) species.
Not to be semantically confused with :
Fragrant Agrimony (Agrimonia procera), Fragrant-Orchid (Gymnadenia conopsea) [plants with similar names belonging to differing families]
Hybridizes in a (unique to the UK) way with :
Evening-primrose (Small-flowered) (Oenothera cambrica),
Evening-primrose (Intermediate) (Oenothera × fallax), Evening-Primrose (Common) (Oenothera biennis) and with any of their hybrids or itself to produce a '
hybrid swarm', whenever two (or more) of those are in proximity. Many of these hybrids have no common nor botanical name. See Hybrid Swarms.
The identifying features to look out for in this species, Oenothera glazioviana are:
- Flower stalk: red towards top
- Flower buds: Long with pink stripes
- Flower size: Large Petals 3-5cm long, wider than they are long.
- Stigma versus Stamen length: Style much longer
- Leaves: Crinkly and warped
- Fruits: hairs with red bulbous bases on the green parts
- Stem: hairs with red bulbous bases on the green parts
This Evening-primrose not only grows near the coast on sand dunes, but also on waysides and waste ground especially any near the sea.
Because the style of Large-evening Primrose is held aloft above the anthers it is less likely to in-breed and more likely to outbreed, taking part in hybrid-swarm orgies. It is the commonest species both in the wild and in gardens and is particularly abundant on the Sefton Coast where it partakes in the hybrid swarm. This species is not closely0 matched in North American populations so there may be a possibility that this species evolved in Europe by both mutation and by hybridisation and therefore was not introduced from North America. It may also be a similar case with some of the distinctive 'segregates' of Common Evening-Primrose (Oenothera biennis) which were once recognised as a separate species:
Welsh Evening-primrose (Oenothera cambrica) which differs from Common Evening-Primrose in having longer petals and fruit capsules and in the lower capsules lacking glandular hairs.