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Montana Field Guide

Montana Field Guides

Castlegar Hawthorn - Crataegus castlegarensis

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Status Under Review
Native Species

Global Rank: G5
State Rank: SNR

Agency Status


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General Description
Shrubs 2–8 m. Stems shiny-brown becoming gray; thorns 13–25 mm long, straight to curved. Leaf blades ovate to obovate, 3–6 cm long, glandular-serrate; sometimes shallowly lobed, appressed-hairy above, sparsely hairy below. Inflorescence 5- to 25-flowered, sparsely long-hairy. Flowers: hypanthium sparsely hairy to glabrous externally; sepals 2–3 mm long, glandular-serrate; petals 5–8 mm long; stamens 10; styles 3 or 4. Pome 8–12 mm wide, black with scattered hairs at maturity (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range Range Descriptions


Range Comments
BC to SK south to OR, UT and WY (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).


The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap: Bombus vagans, Bombus auricomus, Bombus melanopygus, Bombus mixtus, Bombus nevadensis, Bombus pensylvanicus, Bombus bimaculatus, Bombus griseocollis, and Bombus impatiens (Macior 1968, Thorp et al. 1983, Colla and Dumesh 2010).

  • Literature Cited AboveLegend:   View Online Publication
    • Colla, S.R. and S. Dumesh. 2010. The bumble bees of southern Ontario: notes on natural history and distribution. Journal of the Entomological Society of Ontario 141:39-68.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Macior, L.M. 1968. Bombus (Hymenoptera, Apidae) queen foraging in relation to vernal pollination in Wisconsin. Ecology 49:20-25.
    • Thorp, R.W., D.S. Horning, and L.L. Dunning. 1983. Bumble bees and cuckoo bumble bees of California (Hymenoptera: Apidae). Bulletin of the California Insect Survey 23:1-79.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
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Citation for data on this website:
Castlegar Hawthorn — Crataegus castlegarensis.  Montana Field Guide.  .  Retrieved on , from