Desmodium canadense (Showy Tick-trefoil)

Plant Info
Also known as: Hoary Tick-trefoil, Canada Tick-clover
Genus:Desmodium
Family:Fabaceae (Pea)
Life cycle:perennial
Origin:native
Habitat:sun; average to moist sandy or rocky soil; prairies, along shores, along roads, railroads, open woods
Bloom season:July - September
Plant height:2 to 6 feet
Wetland Indicator Status:GP: FAC MW: FACU NCNE: FAC
MN county distribution (click map to enlarge):Minnesota county distribution map
National distribution (click map to enlarge):National distribution map

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Detailed Information

Flower: Flower shape: irregular Cluster type: raceme Cluster type: spike

[photo of flowers] 1 or more spike-like racemes, usually densely packed, of stalked flowers at the top of the stem and arising from upper leaf axils. Flowers are pea-shaped, about ½ inch long, pink to purple with 2 yellow spots near the base of the broad upper lobe. The stamens and pistil form a curving tube that protrudes from the center. The calyx behind the flower and the short flower stalk are reddish green and hairy.

Leaves and stem: Leaf attachment: alternate Leaf type: compound

[photo of leaves] Leaves are compound in 3s, alternately attached, long-stalked near the base becoming shorter stalked as they ascend the stem. Leaflets are hairy, to 3 inches long and 1 inch wide with a rounded or slightly tapering base and blunt point at the tip. The 2 lateral leaflets are short-stalked to nearly stalkless, the end leaflet longer stalked. Stems are unbranched except in the flower clusters, ridged, rough with spreading hairs, and erect to ascending or sometimes sprawling.

Fruit: Fruit type: capsule/pod

[photo of fruit] Fruit is a flat pod 1 to 2½ inches long with 3 to 5 sections, the sections convex on the upper edge and well rounded on the lower, and each containing a single seed. The pod is densely covered in tiny hooked hairs that latch onto anything that passes by.

Notes:

Showy Tick-trefoil tends to grow in clumps. The leaves and flowers are similar to the related Illinois Tick-trefoil (Desmodium illinoense), which typically has a single raceme with more widely spaced flowers, has hooked hairs on the stem, pod with up to 9 sections that are well rounded on both edges, and leaflets with prominent veins on the underside.

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More photos

Photos by K. Chayka taken at Long Lake Regional Park, Ramsey County,and Wild River State Park, Chisago County. Other photos courtesy Peter M. Dziuk.

Comments

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

Posted by: Janice - Kanabec County
on: 2009-08-09 12:37:17

These grow abundantly in Kanabec County.

Posted by: Denise - clay county near Rollag
on: 2010-07-26 09:26:45

This plant grows in clumps in our front yard. We mow around it because we like the flowers and unlike the pointed leaf tick-trefoil, the blossoms don't turn into snags.

Posted by: K. Chayka
on: 2010-07-26 13:14:53

There is a prairie remnant near me that has a fair amount of showy tick-trefoil in it. If I go through there in late summer, when I come out my clothes are just plastered with its pods. It is worse than pointed leaf tick-trefoil, I think. :-) I carefully pluck the pods from my clothes and save them, to be replanted elsewhere.

Posted by: Patricia - Baxter, Mn
on: 2010-07-29 20:23:48

North of Baxter on Hwy 371. Very abundant and beautiful.

Posted by: Mark - Oakdale Nature Preserve, Oakdale MN
on: 2010-08-21 15:14:19

Several (mostly shady) locations in Oakdale Nature Preserve. Seen blooming in late July-early August 2010.

Posted by: Debbie - St. Louis Park
on: 2010-08-30 22:33:51

Edenbrook Conservation Area in Eden Prairie has a good number of these. Have also seen a few on Jim's Prairie, Maplewood.

Posted by: Rachel - Redwood County
on: 2013-07-17 21:07:51

Birch Coulee County Park

Posted by: Kat - Mill Lake near Alexandria in Douglas County
on: 2013-07-18 13:43:06

It was in a ditch by the road in a pretty sunny location. First time seeing it. They're not too common in this area but it was a rather beautiful plant. The plant was about 3' tall.

Posted by: Troy - Lyon County, MN
on: 2014-07-21 13:33:48

Plant found in very large abundance (1+ acre) southwest of Marshall on native prairie site.

Posted by: Marc - Grant County
on: 2014-08-20 15:44:33

Keep STT to a minimum (less than .01 lb./Acre). My mix was .03 and it crowded out other natives and is now quite dominant. Bumblebees, native bees like it. Keep it spotty and you'll be happy. Better yet, don't plant anything with the word "Trefoil" in it.

Posted by: Dave - Nicollet Cnty ditch of Cnty Rd 17, 2 miles N of State Hwy 14
on: 2015-07-19 13:59:50

Just noticed growing in ditch in standing water this summer. Ditch is routinely mowed and baled by local farmer. Was just mowed 2 days ago but did not mow this section due to standing water.

Posted by: linda - Shooting Star Prairie SNA
on: 2015-08-22 09:32:52

Found on a guided tour of this area on 8-8-15.

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