Sphenopholis obtusata (Michx.) Scribn.

vernacular prairie wedgescale — species · Poaceae

USDA: SPOB
GBIF: 2703349
Rank: species

prairie wedgescale (Sphenopholis obtusata) — Platephotograph · Jake SmithCC BY-NC source · iNaturalist ↗

§2Habit & range

Growth habit: Graminoid
Duration: Annual, Perennial
Group: Monocot
Family: Poaceae Barnhart
Genus: Sphenopholis

§2a

Native status, by region

CAN Canada Native
HI Hawaii Introduced
L48 Lower 48 States Native

§2b

County-level range

· 6 counties across 2 states/territories

Legend Native · 6 Introduced · 0 Both · 0 Hover a county for detail.

§3Cultivation specs · USDA

Recorded by the USDA Plant Materials Program.

§3a

Tolerances

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

§3b

Climate & soil

Cold tolerance: -43 °F minimum
Frost-free days: 80 min.
Precipitation: 10–60 in/yr
pH range: 5–7.5
Root depth: 4 in min.
Fertility need: Medium
Soil texture: medium, fine

§3c

Form & growth

Growth form: Bunch
Growth rate: Moderate
Lifespan: Short
Mature height: 3.2 ft
Foliage texture: Fine
Foliage colour: Green
Porosity (summer): Moderate
Porosity (winter): Porous
Flower colour: Green
Fruit colour: Brown
Fire resistant: No
N fixation: None
Toxicity: None

§3d

Reproduction

Bloom period: Spring
Seed abundance: Medium
Seed begins: Summer
Seed ends: Summer
Spread rate: Slow
Stratify: No
Seeds / lb: 200,000
Propagation: seed, container

§3e

Use & availability

Commercial availability: Contracting Only
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 6 counties across 2 states/territories.

Montana view state ↗ 5 N ▾

Rhode Island view state ↗ 1 N ▾

Providence 44007

§5Sources & provenance

USDA PLANTS

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

plants.usda.gov/SPOB ↗

GBIF Backbone

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

gbif.org/species/2703349 ↗

Record version

Cached and built locally. Source version on this record:

usda-plants-mt-2026-05-25

fetched 2026-05-25T18:27:19Z