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Montana Field Guide

Montana Field Guides

Rose Meadowsweet - Spiraea splendens
Other Names:  Spiraea densiflora

Native Species

Global Rank: G5
State Rank: S3S4

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

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General Description
Rhizomatous. Stems 50–100 cm, glabrous to pubescent, light brown. Leaf blades 2–6 cm long, glabrous, glandular-serrate above, entire near the base, green above, paler beneath. Inflorescence hemispheric, 15–50 mm across. Flowers: sepals ca. 1 mm long; petals rose, ca. 2 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.

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

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

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.

Source: Lesica et al. (2012).

Species Range
Present
 


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

Observations in Montana Natural Heritage Program Database
Number of Observations: 85

(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
Stony soil of open forest, rock outcrops, moist meadows, avalanche slopes, often along streams, lakes; subalpine, rarely montane (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Rose Meadowsweet — Spiraea splendens.  Montana Field Guide.  .  Retrieved on , from