Index / Search / Iliamna rivularis
§1 Plant
Iliamna rivularis (Douglas ex Hook.) Greene
vernacular streambank wild hollyhock — species · Malvaceae
§2Habit & range
Habit and range
- Growth habit
- Forb/herb, Subshrub
- Duration
- Perennial
- Group
- Dicot
- Family
- Malvaceae Juss.
- Genus
- Iliamna
§2a
Native status, by region
- CAN Canada Native
- L48 Lower 48 States Native
§2b
County-level range
· 123 counties across 12 states/territories§3Cultivation specs · USDA
Recorded by the USDA Plant Materials Program.
§3a
Tolerances
- Drought
- Low
- Shade
- Medium
- Moisture use
- Medium
- Fire
- Low
- Salinity
- None
- Anaerobic
- Medium
- CaCO₃
- Low
- Hedging
- None
§3b
Climate & soil
- Cold tolerance
- -33 °F minimum
- Frost-free days
- 90 min.
- Precipitation
- 16–55 in/yr
- pH range
- 6–8.5
- Root depth
- 16 in min.
- Fertility need
- High
- Soil texture
- medium
§3c
Form & growth
- Growth form
- Multiple Stem
- Growth rate
- Moderate
- Lifespan
- Long
- Mature height
- 6 ft
- Foliage texture
- Coarse
- Foliage colour
- Green
- Porosity (summer)
- Moderate
- Porosity (winter)
- Porous
- Flower colour
- Red
- Fruit colour
- Brown
- Fire resistant
- No
- N fixation
- None
- Toxicity
- None
§3d
Reproduction
- Bloom period
- Early Summer
- Seed abundance
- Medium
- Seed begins
- Summer
- Seed ends
- Summer
- Spread rate
- Slow
- Stratify
- Yes
- Seeds / lb
- 130,000
- Propagation
- seed
§3e
Use & availability
- Commercial availability
- Contracting Only
- Nursery stock
- No
- Palatable, human
- No
- Lumber
- No
- Christmas tree
- No
§4Counties, by state
Recorded in 123 counties across 12 states/territories.
California view state ↗ 1 N ▾
Colorado view state ↗ 4 N ▾
Idaho view state ↗ 29 N ▾
- Ada 16001
- Adams 16003
- Bannock 16005
- Bear Lake 16007
- Blaine 16013
- Boise 16015
- Bonner 16017
- Bonneville 16019
- Butte 16023
- Cassia 16031
- Clark 16033
- Clearwater 16035
- Custer 16037
- Elmore 16039
- Franklin 16041
- Fremont 16043
- Gooding 16047
- Idaho 16049
- Kootenai 16055
- Latah 16057
- Lewis 16061
- Lincoln 16063
- Madison 16065
- Nez Perce 16069
- Owyhee 16073
- Power 16077
- Shoshone 16079
- Teton 16081
- Valley 16085
Illinois view state ↗ 1 N ▾
Indiana view state ↗ 1 N ▾
Montana view state ↗ 14 N ▾
Nevada view state ↗ 3 N ▾
Oregon view state ↗ 18 N ▾
Utah view state ↗ 23 N ▾
Virginia view state ↗ 5 N ▾
Washington view state ↗ 16 N ▾
§5Sources & provenance
USDA PLANTS
Symbol, taxonomy, distribution, cultivation specs, native status. Public domain.
plants.usda.gov/ILRI ↗GBIF Backbone
Canonical taxonomic identity, synonym resolution, cross-refs. CC0.
gbif.org/species/3152257 ↗Record version
Cached and built locally. Source version on this record:
usda-plants-mt-2026-05-26
fetched 2026-05-26T20:46:58Z