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Montana Field Guide

Montana Field Guides

Dyer's Woad - Isatis tinctoria

Noxious Weed: Priority 1A
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
Glaucous biennial with a woody, branched taproot. Stems erect, simple, 30–100 cm. Basal leaves petiolate, oblanceolate, 5–18 cm long, entire. Stem leaves lanceolate, sessile, auriculate. Vestiture hirsute with simple hair at the stem base, otherwise glabrous. Inflorescence a branched panicle, each raceme ebracteate. Flowers yellow; petals 2.5–3.5 mm long. Fruit narrowly oblong, blunt-tipped, flattened, 12–18 mm long, lacking a septum; style lacking; seed solitary; pedicel reflexed down, 6–10 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Introduced and naturalized throughout intermountain U.S.; native to Europe (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 19

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Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Habitat

References
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Citation for data on this website:
Dyer's Woad — Isatis tinctoria.  Montana Field Guide.  .  Retrieved on , from