Dyssodia papposa (Fetid Marigold)

Plant Info
Also known as: Prairie Dogweed, False Dog-fennel
Genus:Dyssodia
Family:Asteraceae (Aster)
Life cycle:annual
Origin:native to US
Habitat:sun; open, dry, disturbed soil; prairies, fields, roadsides, waste areas
Bloom season:July - October
Plant height:4 to 16 inches
Wetland Indicator Status:none
MN county distribution (click map to enlarge):Minnesota county distribution map
National distribution (click map to enlarge):National distribution map

Pick an image for a larger view. See the glossary for icon descriptions.

Detailed Information

Flower: Flower shape: 5-petals Flower shape: 7+petals Flower shape: bell

[photo of flowers] Flowers are short-stalked, arising singly from leaf axils and at the tips of branches but numerous on a plant, egg to bell shaped, up to ½ inch long. with up to 8 short, deep yellow rays (petals), usually about 5, spreading out at the top around the yellow center disk flowers. The 4 to 9 outer bracts are green, linear, flaring at the tip, 2/3 the length of inner bracts, which are broader and very papery, greenish-orange to purplish in color. These inner bracts each have 1 or more orangish glands scattered on the surface.

Leaves and stems: Leaf attachment: alternate Leaf attachment: opposite Leaf type: lobed Leaf type: simple

[photo of leaves] Leaves are mostly opposite, may be alternate in the upper plant, ¾ to 2 inches long and deeply divided into linear lobes, which may be further divided, lobed, or with a few coarse teeth around the edges. Leaves are hairless to sparsely hairy.

[close-up of glands] Orange-brownish glands dot the foliage which has a spicy pungent odor (not necessarily unpleasant) when crushed. Stems are mostly erect with diffuse branching, finely hairy to nearly smooth throughout.

Notes:

Fetid marigold is native throughout much of the western and south-central Great Plains but is considered adventive (not completely naturalized) in Missouri eastward (including Minnesota), with scattered introductions up into New England as well as west to Utah and Arizona. Collected as early as 1888 in Rock County, another specimen was collected in Houston County in 1980. In the summer of 2012 we collected it in Winona County and a friend found it in Scott. It is small and weedy so can be easily overlooked elsewhere, but it's certain to say it's on the move, typically along the road shoulders of our extensive transportation system.

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More photos

Photos courtesy Peter M. Dziuk taken along Highway 61 in Winona County.

Comments

Have you seen this plant in Minnesota, or have any other comments about it?

Posted by: david - Twin Cities
on: 2014-09-14 13:37:04

All along the shoulder edges of the Interstate and highway systems.

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