Index / Search / Hydrophyllum occidentale

§1 Plant

Hydrophyllum occidentale (S. Watson) A. Gray

vernacular western waterleaf — species · Hydrophyllaceae

USDA: HYOC
GBIF: 2928276
Rank: species

western waterleaf (Hydrophyllum occidentale) — Platephotograph · mollokatCC BY-NC source · iNaturalist ↗

§2Habit & range

Growth habit: Forb/herb
Duration: Perennial
Group: Dicot
Family: Hydrophyllaceae R. Br.
Genus: Hydrophyllum

§2a

Native status, by region

L48 Lower 48 States Native

§2b

County-level range

· 30 counties across 5 states/territories

Legend Native · 30 Introduced · 0 Both · 0 Hover a county for detail.

§3Cultivation specs · USDA

Recorded by the USDA Plant Materials Program.

§3a

Tolerances

Drought: Medium
Shade: Low
Moisture use: Medium
Fire: Low
Salinity: None
Anaerobic: Medium
CaCO₃: Low
Hedging: None

§3b

Climate & soil

Cold tolerance: -18 °F minimum
Frost-free days: 120 min.
Precipitation: 10–24 in/yr
pH range: 6.2–7.5
Root depth: 14 in min.
Fertility need: Low
Soil texture: medium

§3c

Form & growth

Growth form: Single Crown
Growth rate: Moderate
Lifespan: Short
Mature height: 1.5 ft
Foliage texture: Coarse
Foliage colour: Dark Green
Porosity (summer): Porous
Porosity (winter): Porous
Flower colour: White
Fruit colour: Brown
Fire resistant: No
N fixation: None
Toxicity: None

§3d

Reproduction

Bloom period: Late Spring
Seed abundance: Medium
Seed begins: Spring
Seed ends: Summer
Spread rate: Slow
Stratify: Yes
Seeds / lb: 750,000
Propagation: seed, container

§3e

Use & availability

Commercial availability: No Known Source
Nursery stock: No
Browse palatability: Low
Graze palatability: Low
Palatable, human: No
Protein potential: Low
Lumber: No
Christmas tree: No

§4Counties, by state

Recorded in 30 counties across 5 states/territories.

Arizona view state ↗ 2 N ▾

Idaho view state ↗ 2 N ▾

Nevada view state ↗ 5 N ▾

Oregon view state ↗ 11 N ▾

Utah view state ↗ 10 N ▾

§5Sources & provenance

USDA PLANTS

Symbol, taxonomy, distribution, cultivation specs, native status. Public domain.

plants.usda.gov/HYOC ↗

GBIF Backbone

Canonical taxonomic identity, synonym resolution, cross-refs. CC0.

gbif.org/species/2928276 ↗

Record version

Cached and built locally. Source version on this record:

usda-plants-mt-2026-05-26

fetched 2026-05-26T14:17:10Z