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Pennsylvania Rush

Juncus gymnocarpus

Found in bogs, seeps, streambanks and riverbanks (especially just below waterfalls). Weakley, Flora of the Southeastern United States (2025), South Central edition What its natural habitat tells you

44
Good

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

Profile 88%

Height
Up to about 3 feet
Light
Partial shade, Full shade, Full sun
Soil moisture
Moist to wet
Will it fit your yard?

At a glance

Life cycle
Perennial
Bloom
July to September

Not yet recorded · Spread · Leaves

Recorded in 4 Mississippi 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

Seeps and springs

Places where groundwater keeps the soil or rock wet, such as seepage slopes and spring runs.

Streams, rivers and their banks

Flowing water and its banks, bars and rocky shoals.

All habitats

Ecological relationships

Who uses this plant?

What these records mean

5CaterpillarsGenus host records with ranges including MS

Genus host records with ranges including MS · Juncus

  • Acronicta insularisHenry's Marsh Moth, Cattail Caterpillar
  • Bactra furfuranaRush Bactra
  • Bactra verutanaJavelin Moth
  • Cisseps fulvicollisYellow-Collared Scape Moth
  • Coleophora cratipennellaStreaked Coleophora
Shropshire & Tallamy 2025, Lepidoptera of North America north of Mexico, ZooKeys 1261 (ODbL)
2BeesSoutheastern regional records

Southeastern regional records · Juncus

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
5BirdsRecorded genus food-resource interactions; not a state feeding claim

Recorded genus food-resource interactions; not a state feeding claim · Juncus

  • Alectoris chukarChukar
  • Anas acutaNorthern Pintail
  • Coturnicops noveboracensisYellow Rail
  • Lagopus leucuraWhite-tailed Ptarmigan
  • Plectrophenax nivalisSnow Bunting
Hurlbert, Olsen, Sawyer & Winner 2021, Avian Diet Database, Scientific Data 8: 260 (CC0)

Direct food only: birds recorded eating this genus across North America. Caterpillars on host plants also feed nesting birds. NC Native Plant Society: butterfly gardening

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

Growing and identification

Plant details

Family
Juncaceae
Flower color
Green or brown

Safety has not been reviewed for this plant; check toxicity and thorns before planting.

Growing sources and scope

Conservation status

Mississippi rankS3
Global rankG4
MS statusNot verified
Federal statusNot verified

Conservation source Global and federal source

In your garden

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How to check your spot

Sources