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Montana Field Guide

Montana Field Guides

Field Pennycress - Thlaspi arvense

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
Glabrous, taprooted annual. Stems erect, usually branched, 15–60 cm. Leaves basal and cauline; the basal withering early; the cauline oblanceolate, 15–55 mm long, petiolate below, auriculate and clasping above, entire to dentate. Inflorescence an ebracteate raceme. Flowers white; petals 2–4 mm long. Fruits flattened, broadly winged, obovate to nearly orbicular silicles 5–13 mm long, deeply notched at the tip; style up to 0.3 mm long; seeds 2 to 8 per locule; pedicels ascending, 5–12 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Unknown/Undetermined
 


Range Comments
Introduced throughout temperate N. America; native to Europe (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 162

(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
Disturbed soil of fields, roadsides, grasslands, steppe; plains, valleys, montane (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Field Pennycress — Thlaspi arvense.  Montana Field Guide.  .  Retrieved on , from