Largeflower Milkweed
ExplorePlants
Largeflower Milkweed
asclepias connivens
Largeflower Milkweed (Asclepias connivens) is a fascinating perennial wildflower native to the damp, acidic soils of the southeastern United States. Standing out among the milkweed family, this species is named for its relatively large, uniquely structured flowers that form a crucial component of wet pine flatwood and savanna ecosystems. Unlike many of its cousins with sprawling floral clusters, it produces a more compact head of nodding, star-like blooms. As an essential member of the local flora, it plays a vital role in supporting specialized native pollinators and serves as a critical food source for various insect species. Its preference for pristine, undisturbed wetlands makes it a prized find for botanical enthusiasts exploring the southeastern coastal plains.
Habitat: Found in wet pine flatwoods, savannas, and acidic pitcher plant bogs across the southeastern United States.
Appearance
This herbaceous plant typically grows between 40 to 100 cm tall, featuring simple, upright stems with opposite, lance-shaped leaves that clasp directly to the stem. The most distinguishing feature is the cluster of 5 to 15 large, pale green to creamy-yellow flowers, often tinged with purple. Unlike other milkweeds, the floral hoods lean inward and touch at their tips (connivent), creating a distinct closed-conical shape in the center of the bloom. When broken, the stems and leaves exude a thick, sticky white latex sap characteristic of the genus.
KingdomPlantaePhylumTracheophytaClassMagnoliopsidaOrderGentianalesFamilyApocynaceaeGenusAsclepias
Category
PlantsRarity
Common
Danger
1/5 · Very low
Snaps
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Interesting facts
The Latin species name 'connivens' translates to 'converging' or 'winking', referring to the unique way the flower hoods bend inward to touch at the top.
The toxic cardenolides inside the plant's sap can cause cardiac arrest in vertebrate predators, yet specialized insects use it as a defense mechanism.
Unlike common milkweeds which have dozens of small flowers in a sphere, the Largeflower Milkweed has fewer but significantly larger individual flowers.
Special abilities
Ability
Connivent Hoods
The floral hoods curve inward and press together at the tips, protecting the delicate pollen structures from rain while restricting access to specific strong-bodied pollinators.
Ability
Toxic Latex Defense
When damaged, the plant exudes a sticky, white latex sap filled with toxic cardenolides, which deters generalist herbivores while serving as a chemical shield for specialist insects.
Ability
Wetland Resiliency
Adapted to waterlogged, nutrient-poor soils, its specialized root system can survive seasonal flooding and low-oxygen conditions common in southern wet flatwoods.
Measurements & details
- Length
- 40-100 cm
- Lifespan
- 3-10 years
Diet & Feeding
As a photoautotrophic plant, the Largeflower Milkweed manufactures its own energy using sunlight, water, and carbon dioxide through the process of photosynthesis.
Primary Foods
- Sunlight
- Water
- Carbon Dioxide
- Soil Minerals
Ecological connections
host plant
Monarch Butterfly
Danaus plexippus
Monarch caterpillars feed exclusively on milkweed leaves, utilizing the toxic cardenolides for their own defense against predators.
host plant
Queen Butterfly
Danaus gilippus
Another specialist butterfly whose larvae rely on this milkweed for both nourishment and chemical defense.
eaten by
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Large Milkweed Bug
Oncopeltus fasciatus
Feeds on the seeds, flowers, and sap of the plant, absorbing its toxins to ward off predators.
Traits
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Also known as
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Safety
Danger
1/5 · Very low
No special safety notes yet.
Frequently Asked Questions
How to identify Largeflower Milkweed?
The easiest way to identify Largeflower Milkweed is to use the Snappit nature identifier app.
How long is Largeflower Milkweed?
40-100 cm
How long does Largeflower Milkweed live?
3-10 years
What does Largeflower Milkweed eat?
As a photoautotrophic plant, the Largeflower Milkweed manufactures its own energy using sunlight, water, and carbon dioxide through the process of photosynthesis.
Where is Largeflower Milkweed usually found?
Found in wet pine flatwoods, savannas, and acidic pitcher plant bogs across the southeastern United States.
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