Polygala polygama (Racemed Milkwort)
Also known as: | Purple Milkwort, Bitter Milkwort |
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Genus: | Polygala |
Family: | Polygalaceae (Milkwort) |
Life cycle: | biennial |
Origin: | native |
Habitat: | part shade, sun; dry sandy soil, prairies, open meadows, open woods |
Bloom season: | June - August |
Plant height: | 6 to 12 inches |
Wetland Indicator Status: | GP: FACU MW: FACU NCNE: FACU |
MN county distribution (click map to enlarge): | |
National distribution (click map to enlarge): |
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Detailed Information
Flower:
Spike-like raceme, usually loosely arranged, 1 to 4+ inches (to 10+ cm) long at the tip of the stem. Flowers are short-stalked, pink to rose-purple to nearly white, about ¼ inch (4 to 6 mm) long with 2 spreading, petal-like sepals flanking 3 petals rolled into a column with a fringed crest in the center. Petal-less, self-pollinating flowers (cleistogamous) are also produced underground on short stems.
Leaves and stem:
Leaves are alternate, up to about 1 inch (3 cm) long and about ¼ inch (2 to 6+ mm) wide, linear to elliptic to narrowly spatula-shaped, widest at or above the middle, toothless, hairless, blunt or pointed at the tip, tapering to a stalkless base. The lowest leaves may be significantly reduced in size. Stems are leafy, usually unbranched and multiple from the base, erect to ascending or prostrate from the base and rising up at the tip (decumbent).
Fruit:
Fruit is a 2-seeded capsule 2 to 4 mm long, somewhat heart-shaped, broadly elliptic or nearly round in outline. The persistent lateral sepals fold up and wrap around the capsule as it develops, the color fading to pale pink or greenish white. Seeds are up to 3 mm long, variously hairy, with a 2-lobed appendage 1/3 to ¾ as long as the seed.
Notes:
Racemed Milkwort reaches the northwest edge of its range in Minnesota and is primarily found from the Twin Cities Metro area through our southeast counties, but scattered populations are as far north as Beltrami and Lake counties. Habitats are sandy prairies, dunes, savanna and barrens. When open, the flowers are near miniatures of the larger and more showy Gaywings (Polygaloides paucifolia a.k.a. Polygala paucifolia) though flower components are proportionally different.
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More photos
- erect Racemed Milkwort
- stems splaying out
- Racemed Milkwort in a bed of Bearberry
- flowers blooming at the tip, fruit forming below
Photos by K. Chayka taken in Chisago and Wabasha counties. Photos by Peter M. Dziuk in Anoka County and Isanti counties. Polygala polygama fruit photo by Keir Morse used under CC BY-NC-SA 3.0.
Comments
Have you seen this plant in Minnesota, or have any other comments about it?
on: 2015-06-21 14:50:25
Found on the open hillsides/dry prairie area at Pin Oak SNA south of Chatfield, MN
on: 2015-06-23 12:16:34
In bloom at the Hastings Sand Coulee SNA 6-23-15. Also occurs at Grey Cloud Dunes SNA.
on: 2020-07-16 16:59:16
Present at Fremont WMA Southside prairie remnant.
on: 2022-06-19 18:46:24
Surprised to see this popping up in the scraped topsoil part from the removal of an old farms dump site. First time recording this plant in the SE Unit!
on: 2024-06-28 16:27:01
Blooming in my prairie right now.