Fourpoint Evening Primrose
ExplorePlants
Fourpoint Evening Primrose
oenothera rhombipetala
The Fourpoint Evening Primrose is a striking biennial or annual wildflower native to the sandy regions of the central United States. It stands out in its native habitats due to its tall, erect spikes covered in numerous bright yellow flowers. Like other members of the evening primrose family, this plant plays a crucial ecological role by opening its blossoms late in the day, providing an essential nectar source for nocturnal and crepuscular insects, especially sphinx moths. Its ability to colonize nutrient-poor, sandy soils makes it a vital pioneer species that helps stabilize loose soil and prevent erosion.
Habitat: Typically found in sandy soils, sand prairies, open dunes, disturbed roadsides, and waste areas of the central United States.
Appearance
This species typically grows as a single, hairy stem rising up to 100 centimeters. It features lance-shaped, greyish-green leaves that are lightly covered in fine hairs. The defining feature is the terminal spike of flowers, where each blossom displays four distinct, bright yellow petals that are noticeably diamond-shaped (rhombic) and taper to a point. The flowers open progressively from the bottom of the spike upward, accompanied by long, narrow floral bracts.
KingdomPlantaePhylumTracheophytaClassMagnoliopsidaOrderMyrtalesFamilyOnagraceaeGenusOenothera
Category
PlantsRarity
Common
Danger
1/5 · Very low
Snaps
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Interesting facts
Because it thrives in nutrient-poor sand, it is frequently used in ecological restoration projects to stabilize soils and initiate plant succession on degraded land.
The specific epithet 'rhombipetala' is a direct reference to the unique, diamond-like rhombic shape of its four yellow petals.
Unlike many plants that open flowers imperceptibly, the blossoms of this species can sometimes be observed unfolding in real-time at dusk within just a few minutes.
Special abilities
Ability
Nocturnal Blooming
Opens its yellow blossoms rapidly at dusk to target nocturnal pollinators, such as hawkmoths, avoiding daytime nectar thieves.
Ability
Psammophilic Adaptation
Possesses a deep, robust taproot and specialized hairy foliage that allow it to anchor and thrive in dry, shifting sand dunes.
Ability
Delayed Germination
Produces seeds that can remain dormant in sandy soil seed banks for multiple years until ideal moisture and light levels occur.
Measurements & details
- Length
- 30-100 cm
- Lifespan
- 1-2 years
Diet & Feeding
As a photosynthetic autotroph, this plant synthesizes its own organic compounds using sunlight, water, carbon dioxide, and essential soil minerals.
Primary Foods
- Sunlight
- Water
- Carbon dioxide
- Nitrogen
- Phosphorus
Foraging Method
- Photosynthesis
Ecological connections
eaten by
Primrose Moth
Schinia florida
The caterpillar of this moth feeds directly on the developing flowers and seed pods of the primrose.
mutualism
White-lined Sphinx Moth
Hyles lineata
This large moth is a key nocturnal pollinator, drinking nectar from the freshly opened evening flowers.
mutualism
Western Honey Bee
Apis mellifera
Visits the flowers during the early morning hours before they wither in the midday heat, collecting remaining pollen.
Traits
No trait badges are assigned for this object yet.
Also known as
No aliases listed yet.
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Safety
Danger
1/5 · Very low
No special safety notes yet.
Frequently Asked Questions
How to identify Fourpoint Evening Primrose?
The easiest way to identify Fourpoint Evening Primrose is to use the Snappit nature identifier app.
How long is Fourpoint Evening Primrose?
30-100 cm
How long does Fourpoint Evening Primrose live?
1-2 years
What does Fourpoint Evening Primrose eat?
As a photosynthetic autotroph, this plant synthesizes its own organic compounds using sunlight, water, carbon dioxide, and essential soil minerals.
Where is Fourpoint Evening Primrose usually found?
Typically found in sandy soils, sand prairies, open dunes, disturbed roadsides, and waste areas of the central United States.
How does Fourpoint Evening Primrose hunt?
Photosynthesis
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