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Montana Field Guide

Montana Field Guides

Spotted Joepye-weed - Eupatorium maculatum
Other Names:  Eupatoriadelphus maculatus, Eutrochium maculatum

Species of Concern

Global Rank: G5
State Rank: S1S2
* (see State Rank Reason below)

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank: 4
C-value: 5

External Links






State Rank Reason (see State Rank above)
Widespread species known in Montana from a few occurrences in the south-central part of the state on a variety of ownerships. Four of the occurrences are moderate to large-sized populations.
 
General Description
Fibrous-rooted perennial. Stems erect, 50–150 cm, simple, purplish. Herbage puberulent, glandular above. Leaves cauline, short-petiolate, simple, in whorls of 3 or 4; blades lanceolate, 6–15 cm long, serrate. Inflorescence corymbiform, flat-topped, terminal or in upper leaf axils. Heads discoid; involucre tubular, 6–9 mm high; phyllaries imbricate in 3 to 5 series, white to purplish, ovate to oblanceolate, glabrous; receptacle convex, naked. Disk flowers perfect, tubular, 9 to 22, purple; corolla 4–6 mm long; style branches clavate. Achenes obconic, 5-angled, 3–5 mm long, glandular; pappus 1 series of capillary bristles (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Our plants are variety bruneri (A.Gray) Breitung.

Phenology
Flowering in August.

Species Range
Present
 


Range Comments
BC to QC south to AZ. NM, TN and NC (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 31

(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 meadows, springs, margins of spring-fed streams, and swamp thickets in the valleys and on the plains.

Ecological Systems Associated with this Species

References
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Citation for data on this website:
Spotted Joepye-weed — Eupatorium maculatum.  Montana Field Guide.  .  Retrieved on , from