Native Wildflowers of Wisconsin

Table of Contents

Snow Trillium (Trillium nivale)

Photo by Jeff Nesta

Snow trillium (Trillium nivale), a threatened wildflower in Wisconsin, blooms from late March through late April, making it one of the very first spring ephemerals to appear—often while snow is still on the ground. It typically grows to a height of 3 to 6 inches. Its single flower, measuring up to 2 inches across, features three elegant white tepals—structures that combine the characteristics of petals and sepals—alongside three green sepals and six yellow stamens. Below the bloom, three olive green or green leaves are arranged in a whorl, each up to 2 inches long and 1-1/4 inches wide. Snow trillium prefers filtered sunlight during the spring, before the trees leaf out, and light shade during the summer. It also likes loamy or rocky mesic to dry soil enriched with decaying leaf matter. It is commonly found in rich woodlands, thinly wooded bluffs, and upper riverbanks.

Sources:

Wisconsin Department of Natural Resources — Snow Trillium species profile

USDA Plants Database — Trillium nivale

Illinois Wildflowers — Snow Trillium overview

Flora of North America — Trillium nivale botanical description

NatureServe Explorer — Conservation status for Trillium nivale

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Field Thistle (Cirsium discolor)

Field thistle is a native biennial of eastern and central North America, including Wisconsin. It typically stands three to seven feet tall on upright, hairy stems that may branch near the top. The flower heads are one and a half to two inches across, composed entirely of tubular disc florets in soft pink to lavender, occasionally white. Each head sits in a bracted, fish‑scale‑like cup tipped with bent spines. The leaves are deeply lobed and spiny, up to nine inches long and three inches wide, with a distinctive white underside from dense hairs. Stems are hairy but not spiny.

Field thistle is often mistaken for aggressive non‑native thistles such as Cirsium vulgare, but its behavior is entirely different. It grows in open, sunny habitats—moist to dry prairies, pastures, savannas, roadsides, and forest edges—without overwhelming its neighbors. It reseeds readily, helping stabilize disturbed soils and supporting restoration in fragmented landscapes.

Ecologically, field thistle is one of the most generous native thistles. Its late‑season blooms draw bees, butterflies, and hummingbirds. Goldfinches rely on its seeds and use its silky down to line their nests. Painted lady butterflies lay eggs on the plant, and their caterpillars feed on its leaves. In native gardens and prairie remnants, field thistle offers both beauty and function, quietly supporting a wide community of insects and birds.

Sources:

Flora of North America – Cirsium discolor

USDA Plants Database – Cirsium discolor

Illinois Wildflowers – Field Thistle

Minnesota Wildflowers – Field

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Cup Plant (Silphium perfoliatum)

Cup plant is a strong supporter of prairie biodiversity. Its water-holding leaf cups and seeds draw in birds, while its abundant nectar and pollen support a wide array of native bees, butterflies, and beetles. The plant’s sturdy stems and late-season blooms provide critical structure and forage in restored prairies, wetlands, and riparian buffers. As a deep-rooted perennial, it also contributes to soil stabilization and carbon sequestration, making it a valuable ally in ecological restoration and climate resilience.

Cup plant is a native of eastern North America, including Wisconsin. It usually grows six to eight feet tall, bearing numerous two to three-inch, yellow flowers. Each flower head has 20 to 30 yellow rays and darker yellow disks. Leaves often more than ten inches long are joined at the stem to form a small cup. Cup plant thrives in moist, well‑drained soils along prairie edges, stream corridors, and floodplain openings, doing best in full sun but tolerating partial shade.

Sources:

Prairie Moon Nursery — Silphium perfoliatum

USDA PLANTS Database — Silphium perfoliatum

Flora of North America — Silphium perfoliatum

Illinois Wildflowers — Cup Plant

Wisconsin State Herbarium — Silphium perfoliatum

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Meadow Blazing Star (Liatris ligulistylis)

Meadow Blazing Star (Liatris ligulistylis)

Meadow blazing star (Liatris ligulistylis) is a tall, showy prairie perennial, usually two to five feet high on slender, erect stems that may be green to reddish and lightly hairy. Its flower heads are one to about one and a quarter inches wide, each composed of thirty to one hundred pinkish‑purple disc florets. These heads form a loose raceme along the upper stem, giving the plant its feathery, thistle‑like appearance. Leaves are alternate and lance‑shaped, four to eight inches long and up to one and a half inches wide, with sparse white hairs and a smooth texture. Basal leaves are larger and more oblanceolate; upper leaves narrow and become sessile.

Meadow blazing star thrives in full sun and well‑drained soils—especially sandy, loamy, or rocky substrates. It is most common in prairies, meadows, and streambanks across the Midwest. Its nectar‑rich flowers are especially attractive to monarchs during late‑summer migration.

Source‑title list

Flora of North America – Liatris ligulistylis

USDA Plants Database – Liatris ligulistylis

Illinois Wildflowers – Meadow Blazing Star

Minnesota Wildflowers – Meadow Blazing Star

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Purple Giant Hyssop

Purple Giant Hyssop (Agastache scrophulariifolia)

Purple giant hyssop (Agastache scrophulariifolia) is a tall, native mint‑family perennial of eastern North America, usually reaching four to six feet. It grows in upright clumps on square stems that may show purplish tones and light hair. The flower spikes range from one to six inches long and carry many small tubular blossoms in pale purple to lavender. Each flower has a two‑lobed upper lip, a three‑lobed lower lip, and four stamens that extend beyond the corolla. Leaves are opposite, sharply pointed, and borne on short stalks. They are up to four inches long and two inches wide, with coarsely toothed margins and short hairs on the petioles.

Purple giant hyssop favors moist, sandy or loamy soils in partial shade. It grows along woodland edges, in thickets, upland woods, and disturbed floodplain margins. Because it is sensitive to competition, it often persists where light disturbance keeps surrounding vegetation open.

Source‑title list

Flora of North America – Agastache scrophulariifolia

USDA Plants Database – Agastache scrophulariifolia

Illinois Wildflowers – Purple Giant Hyssop

Minnesota Wildflowers – Purple Giant Hyssop

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Wild Cucumber

Wild cucumber (Echinocystis lobata)

Wild cucumber is a native annual vine in the gourd family, common across Wisconsin in moist, sunny places such as streambanks, swamps, thickets, and roadside ditches. In late summer it becomes suddenly visible, draping trees and shrubs with pale, star‑shaped flowers that seem to float above the foliage. The plant germinates each spring after frost, rising on fleshy, grooved stems that can reach twenty to thirty feet. Its leaves are large and palmate, with three to five pointed lobes, arranged alternately along long petioles. From each leaf axil, three‑pronged tendrils curl outward and anchor the vine to nearby vegetation.

Flowering begins in mid‑summer. The yellowish‑white blooms are fragrant and borne in long racemes. Wild cucumber is monoecious: male flowers form showy clusters with six narrow petals, while female flowers are fewer and marked by a small, spiny ovary beneath the petals. Once pollinated, these ovaries swell into the plant’s distinctive fruit—a puffy green pod covered in soft spines. Though cucumber‑like in appearance, the fruit is not edible and may irritate skin.

By fall, the pods dry and turn brown. Each capsule contains four large, flat seeds—two per chamber—and splits open at the base to eject them forcefully. Gardeners who wish to collect seed often bag the pods before they mature. The plant grows readily in rich, moist soil and full sun, and can be started from seed once the soil warms. Its vines can cover arbors, fences, and walls with a temporary curtain of foliage and flowers, though its vigorous growth can overwhelm small shrubs and young trees. Because it self‑seeds freely, pulling young plants early in the season is the simplest way to keep it in check.

Sources:

Flora of North America – Echinocystis lobata

USDA Plants Database – Echinocystis lobata

Illinois Wildflowers – Wild Cucumber

Minnesota Wildflowers – Wild Cucumber

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Thinleaf Sunflower (Helianthus decapetalus)

Thinleaf sunflower (Helianthus decapetalus) is a native perennial of eastern and central North America, including Wisconsin. It usually grows three to six feet tall and often forms loose colonies through its rhizomes. The bright yellow flower heads are two to three inches across, each with eight to twelve rays around a brownish central disk. They appear in open clusters from late summer into early fall and draw a wide mix of pollinators.

The leaves are thin‑textured, lanceolate to ovate, and rough to the touch. They range from three to six inches long and one to three inches wide. Upper leaves are mostly opposite; lower leaves may shift to alternate. Stems are slender, smooth or lightly hairy, and branch near the top. Thinleaf sunflower favors partial shade to dappled sun and grows best in moist, well‑drained soils along woodland edges, thickets, and shaded slopes. Its late‑season bloom and colony‑forming habit make it a steady contributor to pollinator support in naturalistic plantings and restoration work.

Sources:

Flora of North America – Helianthus decapetalus

USDA Plants Database – Helianthus decapetalus

Illinois Wildflowers – Thinleaf Sunflower

Minnesota Wildflowers – Helianthus decapetalus

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Common Sneezeweed (Helenium autumnale)

Despite its name, common sneezeweed won’t make you sneeze. The misnomer stems from historical use—its dried leaves were once used as snuff, prompting sneezing to supposedly rid the body of evil spirits. In reality, this vibrant native wildflower is a boon to Wisconsin’s late-season pollinators, not a trigger for allergies.

Thriving in moist, sunny habitats such as wet meadows and streambanks, Helenium autumnale grows three to five feet tall and bursts into bloom from late summer into fall. Each plant can produce up to 100 flower heads, each one to two inches wide, with 10 to 15 fan-shaped petals tipped in three distinct lobes. These surround a protruding, ball-like center of yellow-green disk florets. Its lance-shaped, stalkless leaves—up to two inches wide and six inches long—add to its robust presence in riparian and prairie-edge ecosystems.

The ecological value of sneezeweed is huge. Its nectar-rich flowers attract a diverse array of native pollinators, especially long-tongued bees like bumblebees and leaf-cutting bees. Syrphid flies and native wasps also frequent its blooms, contributing to pollination while offering pest control in surrounding habitats. Additionally, the plant serves as a larval host for the rigid sunflower borer moth (Papaipema rigida). In wet meadow communities, sneezeweed complements the needs of butterflies such as Duke’s Skipper (Euphyes dukesi), which rely on nearby native sedges for reproduction but benefit from the late-season nectar sneezeweed provides.

Sources:

USDA NRCS PLANTS Database – Helenium autumnale

Flora of North America – Helenium autumnale

Wisconsin State Herbarium – Helenium autumnale species account

Illinois Wildflowers – Common Sneezeweed (Helenium autumnale)

Lady Bird Johnson Wildflower Center – Helenium autumnale profile

Prairie Moon Nursery – Helenium autumnale

BugGuide – Papaipema rigida species information

Michigan State University Extension – Late‑season pollinator plants (includes Helenium autumnale)

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Harebell (Campanula rotundifolia)

Sometimes mistaken for creeping bellflower, harebell is a native perennial wildflower found in Wisconsin and across much of North America. It thrives in a variety of open or lightly shaded environments, including rocky outcroppings along rivers, meadows, and prairies. It prefers well-drained soils. Despite its fragile appearance, harebell is well-adapted to dry, sandy, and gravelly soils, making it a common sight in rugged landscapes. It is resistant to deer and drought. Its long blooming period, from late spring to early autumn, ensures a continuous display of delicate flowers throughout the growing season.

It grows up to 20 inches tall, with thin, wiry stems that support its nodding, bell-shaped flowers. Each flower is less than an inch long and consists of five fused petals, forming a soft, pale bloom. The basal leaves, withering by flowering time, are round, measuring between half an inch to one inch wide, while the upper leaves are grass-like, reaching about three inches in length and only 1/8 to 1/4 inch wide. These leaves alternate along the stem, contributing to the plant’s airy and delicate structure.

Harebell’s historical and cultural significance adds to its charm. In folklore, it has been associated with fairies and enchantment, earning names such as "witch’s thimble" and "bluebell of Scotland." Despite its whimsical reputation, it remains a tough and adaptable plant, capable of thriving in challenging conditions.

Sources:

USDA Plants Database — Campanula rotundifolia

Lady Bird Johnson Wildflower Center — Campanula rotundifolia Profile

Illinois Wildflowers — Harebell

Minnesota Wildflowers — Harebell

Flora of North America — Campanula rotundifolia

Wisconsin State Herbarium — Campanula rotundifolia

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Purplestem Angelica (Angelica atropururea)

Purple-stemmed Angelica is a perennial native to eastern and central North America—including Wisconsin. It can grow up to ten feet tall with most plants in the four to eight foot range. Its flowers are small, only about a quarter inch across, but they bloom in large umbrella-like clusters called umbels that span 8 to 10 inches wide. The flowers are typically white to greenish-white and bloom from late spring into summer. The leaves are compound and can reach up to 24 inches in both length and width. Each leaflet grows to about 4.5 inches long and 2.5 inches wide, with a toothed, oval to lance-oval shape. The stems are hollow, smooth, and purple. They are typically 1 to 2 inches thick. Purple-stemmed Angelica prefers moist to wet, nutrient‑rich soils, with a slightly acidic to neutral pH. It thrives in sunny marshes, wet meadows, and along streambanks, especially where the soil has some lime content, but can survive in partial shade.

Ecologically, purple angelica—as a member of the carrot family—plays a valuable role in supporting biodiversity. Like many other Apiaceae species, it features umbels of flowers that are especially attractive to a wide range of pollinators, including bees and flies. While specific larval host associations for purple angelica remain under-documented, related species in the family are known to support caterpillars of butterflies and moths. By offering nectar, pollen, and shelter, purple angelica contributes to the ecological richness of the wetland environments where it thrives.

Sources:

USDA PLANTS Database — Angelica atropurpurea species profile

Minnesota Wildflowers — Angelica atropurpurea (Purple‑stemmed Angelica)

Illinois Wildflowers — Purple‑stemmed Angelica (Angelica atropurpurea)

Flora of North America — Angelica atropurpurea botanical description

Michigan Flora / University of Michigan — Angelica atropurpurea account

NatureServe Explorer — Angelica atropurpurea conservation status and distribution

UW–Madison Division of Extension — Native wetland plants of Wisconsin

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Cow Parsnip (Heracleum maximum)

Cow parsnip (Heracleum maximum) is a tall, native wildflower found across North America, including Wisconsin. It typically grows 4 to 10 feet tall and bears broad, flat‑topped compound umbels of small white flowers, each umbel spanning 4 to 12 inches across. Individual flowers are about a quarter inch wide, with larger, showier blossoms often forming a lacy ring around the edge. The leaves are enormous and divided into three large lobes or leaflets, with basal leaves reaching up to 18 inches long and wide; their surfaces are softly hairy and coarsely toothed. The stem is thick, hollow, ridged, and covered in fine white hairs, sometimes approaching 2 inches in diameter. Cow parsnip thrives in full sun to partial shade in moist, nutrient‑rich soils, especially along streambanks, forest edges, wet meadows, and cool alluvial flats. Its sap contains furanocoumarins that can cause skin irritation when exposed to sunlight, making it a plant best admired without handling. Ecologically, cow parsnip is an important summer nectar source, supporting a wide range of pollinators—including bees, flies, beetles, and butterflies—drawn to its abundant, accessible umbels.

Sources:

USDA PLANTS Database — Heracleum maximum species profile

Minnesota Wildflowers — Heracleum maximum (Cow Parsnip)

Illinois Wildflowers — Cow Parsnip (Heracleum maximum)

Flora of North America — Heracleum maximum botanical description

Michigan Flora / University of Michigan — Heracleum maximum account

NatureServe Explorer — Heracleum maximum conservation status and distribution

UW–Madison Division of Extension — Native wetland and riparian plants of Wisconsin

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Sessile-leaf Bellwort (Uvularia sessilifolia)

Sessile‑leaf bellwort carries a little woodland intrigue: after it blooms, the plant relies on ants to disperse its seeds, each tipped with a tiny food reward that lures the insects into carrying them deeper into the forest. This delicate spring wildflower grows 4 to 12 inches tall and produces a single drooping, pale yellow flower about an inch long, with six slender, slightly curved tepals. Its leaves—up to 3 inches long and an inch wide—attach directly to the stem without stalks, and the upper stem forks into a subtle zig‑zag pattern that helps position the blossom in the dim understory light. The upper stem often shows a faint reddish‑purple tint as it matures. Blooming early in the season, it offers nectar to the first solitary bees of spring, a valuable resource when few other flowers are open. Sessile‑leaf bellwort thrives in shaded to partly shaded forests with moist, well‑drained, humus‑rich soils and spreads by slender underground stolons, forming loose colonies in long‑undisturbed woodland habitats.

Sources:

USDA PLANTS Database — Uvularia sessilifolia species profile

Minnesota Wildflowers — Uvularia sessilifolia (Sessile‑leaf Bellwort)

Illinois Wildflowers — Sessile‑leaf Bellwort (Uvularia sessilifolia)

Flora of North America — Uvularia sessilifolia botanical description

Michigan Flora / University of Michigan — Uvularia sessilifolia account

NatureServe Explorer — Uvularia sessilifolia conservation status and distribution

UW–Madison Division of Extension — Spring woodland wildflowers of Wisconsin

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American Fly Honeysuckle (Lonicera canadensis)

Not all honeysuckle plants are invasive. American fly honeysuckle is native to Wisconsin. It is a flowering, deciduous shrub that typically reaches a height of 24 to 72 inches. Its light yellow, tubular flowers bloom in late spring, appearing in pairs and measuring about ½ to ¾ inch long. The leaves are simple, light green, and range from 1½ to 3½ inches in length, growing in opposite pairs along the branches. The shrub’s stems are loosely branched, with light brown to brownish-gray bark, while its twigs can vary from green to purplish. This honeysuckle thrives in moist, well-drained soils but can tolerate rocky or gravelly conditions. It is fundamentally a cool forest shrub. It is commonly found in shady woodlands, stream banks, forest edges, and rich understory areas.

Sources:

USDA PLANTS Database — Lonicera canadensis species profile

Minnesota Wildflowers — Lonicera canadensis (American Fly Honeysuckle)

Illinois Wildflowers — American Fly Honeysuckle (Lonicera canadensis)

Flora of North America — Lonicera canadensis botanical description

Michigan Flora / University of Michigan — Lonicera canadensis account

NatureServe Explorer — Lonicera canadensis conservation status and distribution

UW–Madison Division of Extension — Native woodland shrubs of Wisconsin

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Seneca Snakeroot (Polygala senega)

Seneca snakeroot is a perennial herb typically 10 to 18 inches tall. Its flowers form dense, spike‑like racemes at the stem tip, with each small bloom about 1/6 inch long and colored white to greenish‑white, ending in a distinctive fringed crest. The leaves are 1 to 3 inches long and 1/3 to 1 1/3 inch wide, linear to lance‑elliptic, widest at or just below the midpoint, and either smooth or minutely hairy.

This species grows in full to partial sun and favors dry to mesic, well‑drained soils—especially sandy, gravelly, or rocky substrates. In Wisconsin it is found in prairies, savannas, open woodlands, and dry, rocky stream margins or slopes. Its presence often signals intact, undisturbed native plant communities.

Sources:

USDA PLANTS Database — Polygala senega species profile

Minnesota Wildflowers — Polygala senega (Seneca Snakeroot)

Illinois Wildflowers — Seneca Snakeroot (Polygala senega)

Flora of North America — Polygala senega botanical description

Michigan Flora / University of Michigan — Polygala senega account

NatureServe Explorer — Polygala senega conservation status and distribution

UW–Madison Division of Extension — Dry prairie and savanna species of Wisconsin

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White Rattlesnake-Root (Nabalus albus)

Photo by Gary Kurtz

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Shining Lady’s Tresses (Spiranthes lucida)

Photo by Jeff Nesta

Spiranthes lucida, commonly known as shining lady’s tresses, is a perennial orchid native to northeastern North America, including Wisconsin where it reaches the western edge of its range. It typically grows up to 15 inches tall and produces white flowers in a spiral arrangement along a single spike, each featuring a yellow lip. The basal leaves are lance-oblong and remain during flowering.

The species blooms from late May and fruits by mid-Summer. It inhabits saturated but not flooded, calcareous soils in places such as streambanks, fens, river terraces, and old quarries. Its range extends from Nova Scotia to northeastern Wisconsin, and south to Virginia, Arkansas, and Missouri.

Pollination is primarily carried out by short-tongued bees, particularly from the Halictidae family. In some regions, including Wisconsin, it is listed as a species of special concern due to habitat sensitivity.

Sources:

USDA PLANTS Database — Spiranthes lucida species profile

Minnesota Wildflowers — Spiranthes lucida (Shining Lady’s Tresses)

Illinois Wildflowers — Shining Lady’s Tresses (Spiranthes lucida)

Flora of North America — Spiranthes lucida botanical description

Michigan Flora / University of Michigan — Spiranthes lucida account

NatureServe Explorer — Spiranthes lucida conservation status and distribution

UW–Madison Division of Extension — Calcareous fen and groundwater‑dependent plant species

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Bottle Gentian (Gentiana andrewsii)

Photo by Jeff Nesta

Bottle Gentian (Gentiana andrewsii)

Bottle gentian is a native perennial in Wisconsin, usually one to two feet tall and spreading about a foot or slightly more. Its flowers are one to one and a half inches long, deep blue to violet, tubular, and tightly closed even at maturity. The blooms cluster at the tips of the stems late in the season and are pollinated mainly by strong bumblebees that force their way inside.

The leaves are opposite, ovate to lanceolate, and attach directly to the stem without stalks. They are generally up to four inches long and about two inches wide, tapering to a pointed tip. The upper surface is smooth and shiny; the lower surface is similar but slightly duller. The margins are smooth. Bottle gentian grows in moist, rich soils and handles part shade to full sun. It is found in moist prairies, stream edges, floodplain forests, thickets, fens, and other wet to mesic habitats near water.

Sources:

USDA Plants Database – Gentiana andrewsii

Flora of North America – Gentiana andrewsii

Illinois Wildflowers – Bottle Gentian

Minnesota Wildflowers – Bottle Gentian

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Sawtooth Sunflower (Helianthus grosseserratus)

Sawtooth sunflower is a tall, native perennial common in prairies, meadows, and open roadsides. In good sun and moderately drained soils it can reach eight to twelve feet, rising on smooth stems that often show reddish or purplish tones. The flower heads are bright yellow and daisy-like, usually two and a half to four inches across, with ten to twenty rays surrounding a flat to gently domed disk of small tubular florets. These heads form loose clusters at the ends of branching stems late in summer.

The leaves are long and lance-shaped, typically four to twelve inches long and one to four inches wide. Lower leaves are mostly opposite; upper leaves shift to alternate. The upper surface is medium to dark green and rough, while the underside is paler and softly hairy. The margins are sharply toothed, giving the plant its common name. Sawtooth sunflower favors full sun and open ground, and its height and late-season bloom make it a strong contributor to pollinator activity in tall grass habitats.

Sources:

Illinois Wildflowers

USDA Plants Profile

Flora of North America

Minnesota Wildflowers

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Canadian Goldenrod (Solidago canadensis)

Canadian goldenrod is a herbaceous perennial that typically grows two to five feet tall, occasionally reaching six feet in ideal conditions. The stems are erect and usually hairy throughout, though the lower portions can be less hairy. They are not rigid in the sense of being woody; they are firm but flexible.

The flowering panicles are large, plume‑like, and often more than five inches long. The small yellow flower heads are arranged along arching branches, creating the characteristic sweeping shape. Bloom time is late summer into early fall, and the species attracts a wide range of pollinators, including native bees, butterflies, beetles, and wasps.

The leaves are alternate, lanceolate to narrowly lanceolate, typically three to six inches long and up to an inch wide. Margins are sharply serrated. The upper leaf surface is usually rough and may have short hairs; the underside is paler and may be sparsely hairy rather than smooth. Leaf hairiness varies among subspecies, which is why some descriptions differ.

Canadian goldenrod grows in a wide range of soils but is most common in medium‑texture soils with moderate organic matter. It thrives in full sun and tolerates mesic to moderately dry conditions. It is widespread in prairies, old fields, roadsides, rail corridors, and open meadows. It does occur along waterways, but it is not a species of consistently wet ground — that trait belongs more to Solidago gigantea.

Sources:

Illinois Wildflowers – Solidago canadensis

Flora of North America – Solidago canadensis

USDA Plants Database – Solidago canadensis

Minnesota Wildflowers – Canada Goldenrod

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