Hornleaf Riverweed
Podostemum ceratophyllum
In the Carolinas and Georgia, found in attached to rocks and dams in rapidly or slowly flowing water. Weakley, Flora of the Southeastern United States (2025), Carolinas & Georgia edition What its natural habitat tells you
Native to Arkansas. How scores work Is it native here?
Profile 65%
- Light
- Partial shade, Full sun
- Soil moisture
- Standing water
At a glance
- Life cycle
- Perennial
- Bloom
- May to July
Not yet recorded · Height · Spread · Leaves
This plant is missing most of its facts, so Quercus is looking them up in old botany books.
Recorded in 9 Arkansas counties.
Also found with this plant
Wildlife whose habitat models include habitats this plant grows in, in Arkansas. Shared habitat, not food. 131 animals.
- Bald EagleHaliaeetus leucocephalus
- Broad-winged HawkButeo platypterus
- Brown ThrasherToxostoma rufum
- Carolina WrenThryothorus ludovicianus
- Cerulean WarblerDendroica cerulea
- Chipping SparrowSpizella passerina
- Eastern PhoebeSayornis phoebe
- Great Crested FlycatcherMyiarchus crinitus
- Hermit ThrushCatharus guttatus
- Indigo BuntingPasserina cyanea
- MallardAnas platyrhynchos
- Northern ParulaParula americana
- Orange-crowned WarblerVermivora celata
- Pileated WoodpeckerDryocopus pileatus
- Red-bellied WoodpeckerMelanerpes carolinus
- Ring-necked DuckAythya collaris
- Snowy EgretEgretta thula
- Swainson's WarblerLimnothlypis swainsonii
- Tree SwallowTachycineta bicolor
- White-eyed VireoVireo griseus
- Wild TurkeyMeleagris gallopavo
- Willow FlycatcherEmpidonax traillii
- Worm-eating WarblerHelmitheros vermivorum
- American CootFulica americana
Who uses this plant?
0CaterpillarsGenus host records with ranges including AR
0BeesSoutheastern regional records
0Specialist beesPollen specialists
—BirdsRecorded genus food-resource interactions; not a state feeding claimNo records yet · Ants · Beetles · Flies · Adult butterflies / moths · Other wasps · Other insects
Plant details
- Family
- Podostemaceae
- Flower color
- Green
Safety has not been reviewed for this plant; check toxicity and thorns before planting.
Growing sources and scope
- Bloom · “May to July” · Weakley, Flora of the Southeastern United States (2025), Carolinas & Georgia edition · Carolinas and Georgia
- Flower color · “Green” · Lady Bird Johnson Wildflower Center
- Life cycle · “Perennial” · Lady Bird Johnson Wildflower Center
- Light · “Partial shade; Full sun (documented habitat)” · Weakley, Flora of the Southeastern United States (2025), Carolinas & Georgia edition · Carolinas and Georgia
- primary_flower_color · “green” · Lady Bird Johnson Wildflower Center
- Soil · “Water (documented habitat)” · Weakley, Flora of the Southeastern United States (2025), Carolinas & Georgia edition · Carolinas and Georgia
Also known as
Hornleaf; Riffle Weed; River Weed
Conservation status
| Arkansas rank | S3 |
|---|---|
| Global rank | G5 |
| AR status | Not verified |
| Federal status | Not verified |
Will it fit your yard?
Check this plant against your county, sun and soil moisture. Conditions are checked in your browser.
Sources
- Atlas of the Vascular Plants of Arkansas (2013)
- USDA PLANTS
- Vascular Plants of North Carolina (NC Natural Heritage Program)
- Weakley, Flora of the Southeastern United States (2025), Carolinas & Georgia edition
- NatureServe Explorer
- Arkansas occurrence source
- Shropshire & Tallamy 2025, Lepidoptera of North America north of Mexico, ZooKeys 1261 (ODbL)
- Noori, Seltmann & Orr 2026, A curated and integrated dataset for exploring global bee-plant interactions (GloBI), Zenodo, CC BY 4.0
- Smith, Bachelder, Russell, Morales, Mosher & Seltmann 2024, Bee-Specialization-Modeling v0.6.1 (specialist host table compiled from J. Fowler's pollen specialist bee lists), Zenodo, CC BY 4.0
- Hurlbert, Olsen, Sawyer & Winner 2021, Avian Diet Database, Scientific Data 8: 260 (CC0)
- Narango, Tallamy & Shropshire 2020, Few keystone plant genera support the majority of Lepidoptera species, Nature Communications