Search Field Guide
Advanced Search
Montana Field Guide

Montana Field Guides

Purple Loosestrife - Lythrum salicaria

Noxious Weed: Priority 1B
Exotic Species (not native to Montana)

Global Rank: G5
State Rank: SNA

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 0

External Links






 
General Description
Stems 50–150 cm. Herbage glabrate to pubescent. Leaves cordate-based, narrowly lanceolate, 3–10 cm long. Inflorescence a terminal, leafy-bracteate interrupted spike; flowers several in bract axils. Flowers: hypanthium puberulent, 4–5 mm long; sepals ca. 0.5 mm long with longer appendages; petals 7–11 mm long; stamens ca. 12, exserted (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Introduced as an ornamental and escaped throughout northern U.S. and adjacent Canada; native to Eurasia (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 40

(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

References
Login Logout
Citation for data on this website:
Purple Loosestrife — Lythrum salicaria.  Montana Field Guide.  .  Retrieved on , from