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Montana Field Guide

Montana Field Guides

Pyramidal Spiraea - Spiraea x pyramidata

Status Under Review

Global Rank: GNA
State Rank: SNA

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

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General Description
Pyramidal spiraea is a rhizomatous shrub with erect or spreading branches, 5-10 dm (20-40 in) tall. The alternate leaves are elliptic and 2-7 cm (1-3 in) long with margins that are entire below but sharply toothed above. Leaves and stems are generally short-hairy. Numerous tiny flowers occur in finely branched globose clusters that are grouped in a pyramid-shaped inflorescence, 5-10 cm (2-4 in) wide at the base, at the top of the stems. Each flower has a sparsely hairy, cup-shaped calyx, ca. 2 mm long, with 5 reflexed lobes, and the 5 pink-tinged petals are 2-3 mm long. Stamens 25-50; the ca. 5-lobed ovary matures into a capsule 2-3 mm long.

Phenology
Flowering in July.

Diagnostic Characteristics
This plant is thought to be a hybrid between S. betuflifolia and S. douglasii. The inflorescence of the former is flat-topped, while the latter has a branched but spike-like inflorescence.

Species Range
Present
 


Range Comments
BC, MT south to OR and ID (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 4

(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
Moist forests and streambanks in the valleys and montane zone.

References
  • Additional ReferencesLegend:   View Online Publication
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    • Hess, W.J. 1969. A taxonomic study of Spiraea pyramidata Greene (Rosaceae). SIDA 3(5):298-308.
    • Lackschewitz, K., P. Lesica and J. S. Shelly. 1988. Noteworthy collections: Montana. Madrono 35:355-358.
    • Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Schassberger, L.A. 1991. Rare plant inventory of the East Pioneer Mountains. Prepared for the USDA Forest Service, Region 1, Beaverhead National Forest. Montana Natural Heritage Program, Helena, MT. 55 pp.
    • Schassberger, L.A. and J.S. Shelly. 1990. Sensitive plant surveys in the Bull River and adjacent drainages, USDA Forest Service, Region 1, Kootenai National Forest. Unpublished report. Montana Natural Heritage Program, Helena, MT. 60 pp.
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Citation for data on this website:
Pyramidal Spiraea — Spiraea x pyramidata.  Montana Field Guide.  .  Retrieved on , from