Glyceria canadensis (Michx.) Trin.

vernacular rattlesnake mannagrass — species · Poaceae

USDA: GLCA
GBIF: 2705512
Rank: species

rattlesnake mannagrass (Glyceria canadensis) — Platephotograph · christine123CC BY source · iNaturalist ↗

§2Habit & range

Growth habit: Graminoid
Duration: Perennial
Group: Monocot
Family: Poaceae Barnhart
Genus: Glyceria

§2a

Native status, by region

CAN Canada Native
L48 Lower 48 States Native
SPM St. Pierre & Miquelon Native

§2b

County-level range

· 4 counties across 1 state

Legend Native · 4 Introduced · 0 Both · 0 Hover a county for detail.

§3Cultivation specs · USDA

Recorded by the USDA Plant Materials Program.

§3a

Tolerances

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

§3b

Climate & soil

Cold tolerance: -33 °F minimum
Frost-free days: 100 min.
Precipitation: 20–50 in/yr
pH range: 5–8.5
Root depth: 16 in min.
Fertility need: Medium
Soil texture: coarse, medium, fine

§3c

Form & growth

Growth form: Bunch
Growth rate: Moderate
Lifespan: Moderate
Mature height: 3.2 ft
Foliage texture: Medium
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: Indeterminate
Seed abundance: Medium
Seed begins: Spring
Seed ends: Summer
Spread rate: Slow
Stratify: No
Propagation: sprigs

§3e

Use & availability

Commercial availability: Routinely Available
Nursery stock: No
Graze palatability: High
Palatable, human: No
Protein potential: Medium
Lumber: No
Christmas tree: No

§4Counties, by state

Recorded in 4 counties across 1 state.

Rhode Island view state ↗ 4 N ▾

§5Sources & provenance

USDA PLANTS

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

plants.usda.gov/GLCA ↗

GBIF Backbone

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

gbif.org/species/2705512 ↗

Record version

Cached and built locally. Source version on this record:

usda-plants-mt-2026-05-25

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