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Montana Field Guide

Montana Field Guides

Douglas Spiraea - Spiraea douglasii

Status Under Review
Native Species

Global Rank: G5
State Rank: S3?

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 5

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General Description
Stems 1–2 m, pilose, becoming brown, glabrous. Leaf blades 2–8 cm long, glabrous, paler beneath, serrate on the upper half. Inflorescence a conical, pilose panicle 4–20 cm long. Flowers: sepals hairy to glabrous, 0.5 mm long; petals pink or rose, ca. 1.5 mm long. Follicles 2–3 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Diagnostic Characteristics
Pyramidal Spiraea is a natural hybrid between Spiraea douglasii var. menziesii and Spiraea betulifolia var. lucida, which are all present in Montana.

Douglas SpireaSpiraea douglasii, native:
* Inflorescence is cone-shaped, at least three times longer than broad.
* Flowers are pink to rose.
* Montana’s variety is menziesii.

Pyramidal SpiraeaSpiraea x pyramidata, native hybrid:
* Inflorescence is cone-shaped, about as long as broad or up to twice as long as broad.
* Flowers are pink-tinged.

White SpireaSpiraea betulifolia, native:
* Inflorescence is flat-topped to hemispheric, broader than long.
* Flowers are white.
* Leaves are glabrous.
* Montana’s variety is lucida.

Rose MeadowsweetSpiraea splendens, native:
* Inflorescence is flat-topped to hemispheric, broader than long.
* Flowers are rose.
* Leaves are hairy on the margins.

Source: Lesica et al. (2012).

Species Range
Present
 


Range Comments
Southeast AK to CA and ID.

Observations in Montana Natural Heritage Program Database
Number of Observations: 76

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

Recency

 

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



Habitat
Thickets, wet meadows, usually along streams, wetlands; valleys (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Ecology
POLLINATORS
The following animal species have been reported as pollinators of this species or genera where their geographic ranges overlap: Bombus vagans, Bombus auricomus, Bombus fervidus, Bombus nevadensis, Bombus ternarius, Bombus griseocollis, and Bombus impatiens (Macior 1968, Heinrich 1976, Colla and Dumesh 2010, Colla et al. 2011, Koch et al. 2012).

References
  • Literature Cited AboveLegend:   View Online Publication
    • Colla, S., L. Richardson, and P. Williams. 2011. Bumble bees of the eastern United States. Washington, DC: USDA Forest Service, Pollinator Partnership. 103 p.
    • 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.
    • Koch, J., J. Strange, and P. Williams. 2012. Bumble bees of the western United States. Washington, DC: USDA Forest Service, Pollinator Partnership. 143 p.
    • Macior, L.M. 1968. Bombus (Hymenoptera, Apidae) queen foraging in relation to vernal pollination in Wisconsin. Ecology 49:20-25.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
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Citation for data on this website:
Douglas Spiraea — Spiraea douglasii.  Montana Field Guide.  .  Retrieved on , from