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Montana Field Guide

Montana Field Guides

Yellow Iris - Iris pseudacorus

Noxious Weed: Priority 2A
Aquatic Invasive Species
Exotic Species (not native to Montana)

Global Rank: GNR
State Rank: SNA

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

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General Description
Stems clumped, 35–90 cm. Leaves basal and cauline, 5–60 cm × 6–15 mm. Inflorescence of 3 to 10 flowers, often branched above; spathes 4–7 cm long; the outer keeled; pedicels 2–4 cm long. Flowers: sepals 5–6 cm long, yellow with brown penciling; petals yellow, ca. 3 cm long; lobes of style branches yellow, fringed, ca. 5 mm long. Capsule obovoid, 3-angled, 3–7 cm long(Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Native to Europe; introduced throughout temperate N. America; collected in Lake and Sanders County (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 5

(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
Marshes, wet meadows, irrigation ditches; valleys (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Yellow Iris — Iris pseudacorus.  Montana Field Guide.  .  Retrieved on , from