Partridge Pea

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Taxonomy

Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Subfamily: Caesalpinioideae
Genus: Chamaecrista
Species: Chamaecrista fasciculata

Common Names by Region

• Partridge Pea
• Sleeping Plant
• Sensitive Pea
• Wild Senna (informal, not true Senna)

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Description

Growth Habit

An upright native annual legume typically reaching 1–3 feet in height. Light, airy structure with branching stems and fine compound foliage.

Leaves

Even-pinnate compound leaves composed of many narrow paired leaflets. Leaves may fold slightly under stress or at night.

Flowers

Bright yellow, five-petaled flowers with prominent curved dark anthers. Blooms appear singly or in small clusters along the upper stems from midsummer into early fall.

Fruit

Slender, bean-like seed pods that dry and twist open, ejecting seeds explosively when mature.

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Known Range

Native throughout eastern and central North America, including:

• Pennsylvania
• Midwest states
• Southeastern U.S.
• Parts of southern Canada

Common in:

• Open fields
• Road edges
• Prairie remnants
• Disturbed soils
• Meadow restoration projects

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Care / Habitat

Light: Full sun
Soil: Tolerates poor, sandy, or compacted soils
Moisture: Moderate to dry
pH: Broad tolerance

This species thrives in disturbed ground and is often used in prairie mixes and erosion control blends.

As a legume, it forms symbiotic relationships with nitrogen-fixing bacteria, improving soil fertility over time.

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Propagation / Reproduction

• Reproduces by seed.
• Seed pods naturally shatter and broadcast seed.
• Scarification (light abrasion or winter exposure) improves germination rates.
• Readily self-seeds in suitable conditions.

Because it is an annual, reseeding is essential for long-term presence.

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Pests / Diseases / Threats

Generally resilient.

• Deer may browse young plants.
• Competes poorly in dense, shaded environments.
• Can disappear if succession advances without disturbance.

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Additional Notes

• Critical pollinator plant, especially for specialist bees.
• Host plant for several sulfur butterfly species.
• Excellent early-stage colonizer in regenerative systems.
• Works well in rotational meadow systems and native restoration.

In ecological design, partridge pea acts as a nitrogen-building annual bridge species before longer-lived perennials establish dominance.

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Maintenance / Management

• Allow seed pods to mature for natural reseeding.
• Light disturbance (mowing late fall or early spring) can encourage annual return.
• Avoid heavy mulching in seeded areas.
• Integrates well with native grasses and perennial legumes.

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