Search Field Guide
Advanced Search
MT Gov Logo
Montana Field Guide

Montana Field Guides

Green Ash - Fraxinus pennsylvanica

Native Species

Global Rank: G5
State Rank: S5

Agency Status
MNPS Threat Rank:
C-value: 4

External Links

General Description
Dioecious tree to 12 m with an open crown and spreading branches. Bark dark gray, shallowly furrowed; twigs green to brown. Leaves opposite, petiolate, ovate in outline, odd-pinnate with 5 to 7 leaflets; leaflets short-petiolate, lanceolate, serrate, 5–12 cm long, mostly glabrous. Inflorescence a panicle, appearing before the leaves. Flowers unisexual; calyx 1–1.5 mm long, cup-like with 4 shallow lobes; corolla absent; male flowers with 2 stamens, 2–4 mm long; female flowers with 2 aborted stamens and 1 pistil; ovary superior; stigma 2-lobed. Fruit a 1-seeded oblong, flattened, distally-winged samara, 2–4 cm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range


Range Comments
MT to QC south to TX, LA and FL (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 328

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Along rivers, streams, ephemeral drainages, cool north-facing slopes; plains(Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Predicted Suitable Habitat Model

This species has a Predicted Suitable Habitat Model available.

To learn how these Models were created see

Ecological Systems Associated with this Species

  • Literature Cited AboveLegend:   View Online Publication
    • Lesica, P. and C. Marlow. 2013. Green Ash Woodlands, A Review. Research Bulletin No. 4601. Montana State University Extension. Bozeman, MT. 19 pp.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Egan, J.L. 1957. Some relationships between mule deer and alfalfa production in Powder River County, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 34 p.
    • Gobielle, J. 1992. The effects of fire on Merriam's turkey broad habitat in southeastern Montana. M.S. thesis, Montana State University, Bozeman. 61 pp.
    • Little, E.L., Jr. 1979. Checklist of United States trees (native and naturalized). Agriculture Handbook No. 541. U.S. Forest Service, Washington, D.C. 375 pp.
    • Selting, J.P. 1994. Seasonal use of agricultural lands by Mule Deer, White-Tailed Deer, and Pronghorn Antelope in Carter County, Montana. M.Sc. Thesis. Bozeman, Montana: Montana State University. 66 p.
  • Web Search Engines for Articles on "Green Ash"
Login Logout
Citation for data on this website:
Green Ash — Fraxinus pennsylvanica.  Montana Field Guide.  .  Retrieved on , from