Minnesota Seasons - field pennycress


field pennycress				More photos…
Thlaspi arvense

Taxonomy	Family:	Brassicaceae (mustard)
	Tribe:	Thlaspideae

Nativity	Native to Europe, Asia, Pakistan, and the Madeira Islands. Introduced and naturalized.
Status	Minnesota restricted weed seed
Habitat	Roadsides, weedy meadows, cultivated fields, gardens, disturbed sites
Flowering	April to June
Flower Color	White
Height	4″ to 20″

Identification	The seed pods are flat, round, and at least ⅓″ long when mature. They are notched at the tip, the notch much deeper than it is wide. There is a distinct separation between the outer, papery winged margin of the pod and the two seeds it contains. The large size and shape of the pods is the plant’s most distintive feature.

Similar Species	Shepherd’s purse (Capsella bursa-pastoris) has seed pods that are triangular, about ¼″ long at maturity, and are not notched.

Range			Sources: 2, 3, 5, 7.

Sightings	Chamberlain Woods SNA Chimney Rock SNA Fort Ridgely State Park Lake Rebecca Park Reserve Lost Valley Prairie SNA			Morton Outcrops SNA

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Synonyms

Common Names	fanweed field pennycress Frenchweed mithridate mustard pennycress stinkweed