Polymnia canadensis (Leafcup)

Plant Info
Also known as: White-flower Leaf-cup
Genus:Polymnia
Family:Asteraceae (Aster)
Life cycle:perennial
Origin:native
Habitat:part shade, shade; moist, rich woods, ravines
Bloom season:June - September
Plant height:2 to 5 feet
Wetland Indicator Status:none
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: 5-petals Flower shape: 6-petals Flower shape: 7+petals Cluster type: raceme

[photo of flowers] Nodding clusters at the tips of branching stems, each with 2 to 5 stalked flower heads. Flower heads are 1/3 to ½ inch across typically with 5 to 8 white rays (petals) that are quite short and have 3 small lobes at the tip. Flowers in the center disk are creamy white to pale yellow. Occasionally the ray flowers are unlobed, or as long as or longer than the center disk, or absent altogether.

[photo of glandular hairy bracts] The bracts (phyllaries) surrounding the base of the flower are in 2 series. The outer are very narrow and curl back (recurved), the inner are broader and usually shorter than the outer. Phyllaries and flower stalks are densely hairy, often glandular.

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

[photo of leaves] Leaves are opposite, 4 to 10 inches long, up to 5 inches wide, broadly lance-oblong in outline, typically with 3 to 11 deep, irregular and angular lobes, though uppermost leaves may be smaller and unlobed. Edges are minutely to coarsely toothed and fringed with short hairs; surfaces are variably hairy, more so along major veins on the underside. The base of the blade sometimes extends down the leaf stalk, creating broad, irregular wings.

[photo of stipules (underside)] At the base of the leaf stalk is a pair of leafy appendages (stipules) that are hemispheric in outline, shallowly lobed, coarsely toothed and hairy. Leaf stalks are hairy and up to 4 inches long. Stems are erect, branched in the upper plant, densely hairy and often glandular.

Fruit: Fruit type: seed without plume

Fruit is a dry seed without a tuft of hairs.

Notes:

Leafcup reaches the northwest tip of its range in Minnesota and is a plant of damp, shady woodlands and ravines. The leaves are somewhat similar to Appendaged Waterleaf (Hydrophyllum appendiculatum), which may be found in the same habitat, but has leaves with fewer and usually shallower lobes (lower leaves in particular), and 5-petaled saucer to bell-shaped lavender flowers.

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More photos

Photos by K. Chayka taken at Whitewater Wildlife Management Area, Winona County. Photos courtesy Peter M. Dziuk taken in Fillmore, Houston and Winona counties.

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