Menispermum canadense (Canada Moonseed)

Plant Info
Also known as:
Genus:Menispermum
Family:Menispermaceae (Moonseed)
Life cycle:perennial woody
Origin:native
Habitat:part shade, sun; moist woods, woodland edges, clearings, thickets
Bloom season:May - July
Plant height:6 to 30 foot vine
Wetland Indicator Status:GP: FACU MW: FAC NCNE: FAC
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: 6-petals Flower shape: 7+petals Flower shape: indistinct Cluster type: panicle

[photo of male flowers] Branching clusters up to 7 inches long arising from the leaf axils, with male and female flowers in separate clusters on the same or different plants. Flowers of both are less than ¼ inch across, somewhat bell-shaped with 4 to 9 greenish-white petals and 4 to 9 greenish-white sepals that are longer than the petals. Male flowers have a spray of 12 to 24 white stamens with yellow tips.

[photo of female flowers] Female flowers have 2 to 4 stout pistils with a somewhat ruffled stigma at their tips, and usually surrounded by several short, sterile stamens. Flower stalks are green and hairless to sparsely hairy with an oblong leaf-like bract at the base.

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

[photo of leaves] Leaves are alternate, 3 to 8 inches long and about as wide, mostly heart-shaped at the base, with 7 to 12 primary veins radiating from the base. Leaf edges are toothless and have 3 to 7 shallow lobes, the lobe tips rounded to bluntly pointed. The upper surface is medium to dark green, hairless or becoming hairless with age, the lower surface paler and finely hairy, especially along the veins.

[photo of leaf stalk attachment] Leaf stalks are up to 8 inches long and attached on the underside near but not at the base of the leaf (peltate). New stem growth is green and hairy turning reddish or purplish, woody and eventually hairless. Stems lack tendrils and twine around other vegetation for support or sprawl along the ground, and form loose colonies from spreading rhizomes.

Fruit: Fruit type: berry/drupe

[photo of ripening fruit] Fruit is a berry-like drupe about 1/3 inch diameter, ripening to blue-black with a white bloom, and very much resembling wild grape. Inside is a single, flat, crescent-shaped seed.

Notes:

Canada Moonseed leaves are rather variable in size and shape. The more deeply lobed leaves may resemble Wild Cucumber (Echinocystis lobata) or Wild Grape (Vitis riparia), while the less lobed leaves may resemble Bur Cucumber (Sicyos angulatus), or Wild Yam (Dioscorea villosa). Of these species, only Grape and Moonseed have woody stems. The unique leaf stalk attachment (peltate) and the single, crescent-shaped seed in the mature fruit further distinguishes Canada Moonseed from all the rest. The fruits are reportedly toxic and should not be eaten.

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More photos

Photos by K. Chayka taken in Ramsey and Washington counties. Photos courtesy Peter M. Dziuk taken in Anoka and Ramsey counties.

Comments

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

Posted by: Calvin C U - Winona
on: 2017-06-07 21:35:35

Found this vine in my garden growing with my clematis. Thought it was wild cuke, but after looking at your website, concluded it is moonseed. Hasn't flowered or seeded yet, but I will watch and see.

Posted by: Claire - Sunrise River, Chisago County
on: 2018-01-12 13:50:11

I believe this is plentiful as the Sunrise river nears the St. Croix (wooded banks, soil stays coolish). It hitches a ride up other vines if it can, but doesn't seem overly aggressive. I'll try to spot the flowering this spring.

Posted by: Philip S - Minneapolis
on: 2018-06-07 19:10:38

Found some growing on state land down by the river flats around the Fort Snelling area, behind Coldwater Spring.

Posted by: Mary - Hastings
on: 2019-05-06 18:14:14

Have quite a bit in my yard. It’s invasive. A pretty vine but only if it wouldn’t spread so much and if it weren’t supposed to be toxic.

Posted by: K. Chayka
on: 2019-05-06 19:29:30

Mary, many native species can be aggressive in a garden setting due at least in part to lack of sufficient competition. Vines can be a particular nuisance and may require continuous management.

Posted by: Helen Canfield - SAINT PAUL
on: 2019-06-11 16:21:27

I have been trying to id this vine for years. It has come through the fence from the neighbors. It can be very invasive and difficult to manage. It grows very quickly. I also have never seen the flowers but will watch for them.

Posted by: K. Chayka
on: 2019-06-12 07:40:16

We've found most native vines to be pretty aggressive in cultivation, where they compete very well with pretty much everything else. Don't feel obligated to keep it around just because it's native.

Posted by: Buzzy Bohn - North Minneapolis
on: 2019-06-26 13:56:20

I've had a small bit of it growing in my yard for a few year., For some reason this year, it just really took off and started taking over my Lily of the Valley and Bleeding Hearts so I've had to cut it back.

Posted by: Luanne Lemberg - Ramsey, MN 55303
on: 2019-07-09 15:49:46

Does this vine have a very strong yellow/gold root that runs underground but very shallow? A very invasive vine with exact shaped leaves is running rampant in some bushes and trees on our property.

Posted by: K. Chayka
on: 2019-07-09 18:46:09

I've read elsewhere that the roots are yellow

Posted by: Robin - NW St Paul
on: 2019-07-29 15:28:17

I carefully transplanted some, decades ago. Now.... I can’t get rid of it. It merrily grows over everything, including up trees, though I haven’t given it the opportunity to see how high it will go.

Posted by: Michael Bonner - Courtland river bottom
on: 2020-07-29 19:23:26

It's been by my door for the 29 years I've owned my place. Know now not to make jam from the succulent looking ripe berries! I just keep trimming it back and it's not a problem. Looks good too.

Posted by: Fred Crea - Minneapolis
on: 2020-08-05 23:23:14

There is some of it along fence along the parkway between Franklin & Lake St bridges. There is a large area where it dominates, spreading eastward, at the base of the stairs down from Franklin.

Posted by: Mari (Teigland) Hoyt - Minneota, MN
on: 2021-05-18 09:21:23

In approximately 1918 my uncle died as a young child. I always assumed it was from the flu pandemic. But recently my aunt, his younger sister, told me it was from eating something they found while playing out in the fields. Another sister was very ill and they didn't expect her to survive the night, but she pulled through. An older brother, who also ate the berries, was not affected. In researching the plants in the area, I'm fairly certain they ingested the grape-like moonseed. A very sad story.

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