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River Oats

Chasmanthium latifolium

In the Carolinas and Georgia, found in streams, rivers and their banks; floodplain and bottomland forests; glades, barrens and outcrops on limestone; glades, barrens and outcrops on mafic or serpentine rock; seeps and springs. Weakley, Flora of the Southeastern United States (2025), Carolinas & Georgia edition What its natural habitat tells you

40
Good

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

Profile 100%

Height
2–5 feet
Spread
1–2.5 feet
Light
Dappled sunlight, Partial shade
Soil moisture
Usually moist

Space about 2 ft apart from its recorded spread, about 25 per 100 sq ft. Enter your bed size for a count

Will it fit your yard?

At a glance

Life cycle
Perennial
Leaves
Deciduous
Bloom
June to October
Fruiting season
Summer to fall

Recorded in 63 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 5

Glades, barrens and outcrops on limestone

Standing water, Flat Rock Cedar Glades and Barrens SNA, Rutherford County
Standing water on a limestone glade. Shown: Flat Rock Cedar Glades and Barrens State Natural Area, Rutherford County, Tennessee, a neighboring state.Standing water, Flat Rock Cedar Glades and Barrens SNA, Rutherford County, Alan M. Cressler / U.S. Geological Survey, undated. Public domain. Source record.

Streams, rivers and their banks

Flowing water and its banks, bars and rocky shoals.

Floodplain and bottomland forests

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

Glades, barrens and outcrops on mafic or serpentine rock

Open, thin-soil openings, outcrops and cliffs on dark, magnesium- or iron-rich rock such as serpentine, diabase or gabbro.

Seeps and springs

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

All habitats

Also found with this plant

Wildlife whose habitat models include habitats this plant grows in, in Arkansas. Shared habitat, not food. 157 animals.

All wildlife of Arkansas

Ecological relationships

Who uses this plant?

What these records mean

9CaterpillarsGenus host records with ranges including AR

Genus host records with ranges including AR · Chasmanthium

  • Amblyscirtes belliBell's Roadside-Skipper
  • Amblyscirtes hegonPepper and Salt Skipper
  • Amblyscirtes lindaLinda's Roadside-Skipper
  • Amblyscirtes vialisCommon Roadside-Skipper, Black Little Skipper
  • Atrytone byssusByssus Skipper, Golden Skipper
  • Cyllopsis gemmaGemmed Satyr
  • Lerema acciusClouded Skipper, Corn Leaf tier
  • Lethe anthedonNorthern Pearly Eye
  • Lon zabulonZabulon Skipper
Shropshire & Tallamy 2025, Lepidoptera of North America north of Mexico, ZooKeys 1261 (ODbL)
1BeesSoutheastern regional records

Southeastern regional records · Chasmanthium

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
Poaceae
Hardiness
Zones 5a–9b
Flower color
Brown/copper, green or purple
Growth rate
Moderate
Growth habit
Spreads by rhizomes
Foliage color
Green
Fruit begins
Summer
Fruit ends
Fall

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

Growing sources and scope
Also known as

Broadleaf Wood Oats; Uniola latifolia; oats

Conservation status

Arkansas rankSNR
Global rankG5
AR statusNot verified
Federal statusNot verified

Conservation source Global and federal source

In your garden

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Check this plant against your county, sun and soil moisture. Conditions are checked in your browser.

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How to check your spot

Growing cautions

For planning only; these do not change the score or Fit.

Sources