Index / Search / Alnus incana ssp. rugosa
§1 Plant
Alnus incana (L.) Moench ssp. rugosa (Du Roi) R.T. Clausen
vernacular speckled alder — subspecies · Betulaceae
§2Habit & range
Habit and range
- Growth habit
- Shrub, Tree
- Duration
- Perennial
- Group
- Dicot
- Family
- Betulaceae Gray
- Genus
- Alnus
§2a
Native status, by region
- CAN Canada Native
- L48 Lower 48 States Native
- SPM St. Pierre & Miquelon Native
§2b
County-level range
· 3 counties across 1 state§3Cultivation specs · USDA
Recorded by the USDA Plant Materials Program.
§3a
Tolerances
- Drought
- Low
- Shade
- Medium
- Moisture use
- Medium
- Fire
- Medium
- Salinity
- Low
- Anaerobic
- High
- CaCO₃
- Medium
- Hedging
- Low
§3b
Climate & soil
- Cold tolerance
- -47 °F minimum
- Frost-free days
- 80 min.
- Precipitation
- 21–65 in/yr
- pH range
- 4.8–7.7
- Root depth
- 24 in min.
- Fertility need
- Medium
- Soil texture
- medium, fine
§3c
Form & growth
- Growth form
- Multiple Stem
- Growth rate
- Moderate
- Lifespan
- Long
- Mature height
- 16 ft
- Height @ 20 y
- 16 ft
- Foliage texture
- Coarse
- Foliage colour
- Dark Green
- Porosity (summer)
- Dense
- Porosity (winter)
- Moderate
- Flower colour
- Yellow
- Fruit colour
- Brown
- Fire resistant
- No
- N fixation
- Low
- Toxicity
- None
§3d
Reproduction
- Bloom period
- Early Spring
- Seed abundance
- Low
- Seed begins
- Spring
- Seed ends
- Fall
- Spread rate
- Slow
- Stratify
- Yes
- Seeds / lb
- 1,084,250
- Propagation
- seed, bare root, container
§3e
Use & availability
- Commercial availability
- Routinely Available
- Nursery stock
- Yes
- Browse palatability
- Low
- Graze palatability
- Low
- Palatable, human
- No
- Protein potential
- Low
- Lumber
- No
- Fuelwood
- Low
- Christmas tree
- No
§4Counties, by state
Recorded in 3 counties across 1 state.
Rhode Island view state ↗ 3 N ▾
§5Sources & provenance
USDA PLANTS
Symbol, taxonomy, distribution, cultivation specs, native status. Public domain.
plants.usda.gov/ALINR ↗GBIF Backbone
Canonical taxonomic identity, synonym resolution, cross-refs. CC0.
gbif.org/species/2876469 ↗Record version
Cached and built locally. Source version on this record:
usda-plants-mt-2026-05-25
fetched 2026-05-25T18:27:19Z