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Ribbed Bishopweed

Ptilimnium costatum

In the Carolinas and Georgia, found in tidal freshwater marshes, wet prairies, bottomland hardwood forests. Weakley, Flora of the Southeastern United States (2025), Carolinas & Georgia edition What its natural habitat tells you

24
Good

Native to Arkansas. How scores work Is it native here?

Profile 88%

Height
Up to about 5 feet
Light
Partial shade, Full sun
Soil moisture
Moist to standing water
Will it fit your yard?

Rare or protected plant. Specialist conservation planting; excluded from routine garden suggestions. Plant caution source

Hidden from default planting suggestions. Wildlife value and native status remain unchanged.

At a glance

Life cycle
Annual
Bloom
June to October
Fruiting season
Mid July to October

Not yet recorded · Spread · Leaves

Recorded in 8 Arkansas counties.

Natural habitats

Places it grows wild. Not a planting requirement. Each habitat page lists the plants and wildlife also found there.

1 of 2

Prairies and grasslands

Open, grass-dominated places kept open by fire, grazing or thin soil, from tallgrass prairie to Piedmont prairies.

Floodplain and bottomland forests

Forests on low ground beside rivers and streams that flood from time to time.

All habitats

Ecological relationships

Who uses this plant?

What these records mean

1CaterpillarsGenus host records with ranges including AR

Genus host records with ranges including AR · Ptilimnium

Shropshire & Tallamy 2025, Lepidoptera of North America north of Mexico, ZooKeys 1261 (ODbL)
7BeesSoutheastern regional records

Southeastern regional records · Ptilimnium

Individual names are not available yet.

Noori, Seltmann & Orr 2026, A curated and integrated dataset for exploring global bee-plant interactions (GloBI), Zenodo, CC BY 4.0
0Specialist beesPollen specialists
—BirdsRecorded genus food-resource interactions; not a state feeding claim

No records yet · Ants · Beetles · Flies · Adult butterflies / moths · Other wasps · Other insects

Growing and identification

Plant details

Family
Apiaceae
Flower color
White
Fruit begins
Mid July
Fruit ends
October
Growing sources and scope
Also known as

Big Bishopweed; Ribbed Mock Bishopweed

Conservation status

Arkansas rankS1
Global rankG4
AR statusNot verified
Federal statusNot verified

Conservation source Global and federal source

In your garden

Will it fit your yard?

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How to check your spot

Sources