Mineral Wildflower Festival
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SIERRA FELABANE
SIERRA FELABANE
Erigeron linearis
Brief Summary
Sierra Fleabane is a resilient, low-growing perennial wildflower belonging to the aster and sunflower family (Asteraceae). Developing a tough, compact habit to survive the intense sun and thin soils of northern California's volcanic ridges, it introduces a soft, cheerful dusting of lavender and gold to an otherwise rugged alpine landscape.
Brief Summary of Floral Composition
The blossom is a textbook composite head typical of the aster family. It bundles two highly efficient floral structures into a single visual target: an outer ring of dozens of incredibly narrow, fertile ray florets structurally adapted to mimic delicate petals and signal to pollinators, and a central hub packed with tiny, tubular yellow disc flowers that mature progressively to ensure successful seed production.
Technical Name
Erigeron linearis or Erigeron miser (The genus is Erigeron, a diverse group of native mountain daisies perfectly adapted to rugged, volcanic terrains).
Informal Names
Sierra fleabane
Sierra daisy
Mountain daisy
Fleabane aster
Key Characteristics
The Flower Head: Features classic daisy-like blossoms spanning about 0.5 to 1 inch across. They consist of a dense, flat, bright yellow central disc surrounded by numerous narrow, delicate ray petals that range from pale lavender-pink to near-white.
Foliage and Stems: The leaves are narrow, linear, and covered in fine, short, grayish-green hairs that help the plant retain moisture in dry, windy environments. The stems are low-growing, often branching from a woody base.
Growth Habit: A hardy, low-profile, mat-forming perennial herb that hugs the ground to shelter itself from the harsh conditions of exposed mountain slopes.
Notable Significance
Volcanic Specialist: It is exceptionally well-suited to the rocky, scree-heavy, volcanic soils surrounding the Lassen region, acting as a rugged pioneer species that secures loose soil on steep terrains.
Insect Lifeline: Blooming through the hot mid-summer months, it serves as a critical nectar and pollen station for high-altitude native bees, small butterflies, and pollinating flies when softer meadow plants begin to dry out.
The "Fleabane" Name: The common name "fleabane" stems from an ancient, mistaken belief that drying and burning the plants could drive away fleas and other pests.
Locations Found
Habitat: Thrives in full sun, demanding dry, rocky, gravelly soils, exposed ridges, talus slopes, and open, dry coniferous forests.
Elevation Range: Highly adapted to montane and subalpine zones, commonly found carpeted across rocky openings at elevations between 4,000 and 9,000 feet throughout the Southern Cascade and Sierra Nevada ranges.
What is the difference between the Sierra Felabane and the Hoary Aster?
While Sierra Fleabane / Sierra Daisy (Erigeron linearis or Erigeron miser) and the Hoary Aster (scientifically known as Dieteria canescens, formerly Machaeranthera canescens) are both tough, drought-tolerant, daisy-like wildflowers that inhabit the volcanic, rocky slopes of Northern California, they belong to different genera and can be distinguished by a few clear botanical features:
1. Flower Petal (Ray) Color
Sierra Fleabane: Typically features pale lavender, soft pink, or near-white ray petals surrounding a bright yellow center.
Hoary Aster: Usually displays much darker, more vibrant deep violet-purple or rich blue ray petals around its central yellow disc. (Note: A rare mountainous variety, var. shastensis, grows in Northern California and lacks ray petals entirely).
2. The Leaf Margins (Edges)
Sierra Fleabane: Features entire (completely smooth) leaf edges with no teeth, lobes, or serrations.
Hoary Aster: The leaf margins are typically sharply toothed, jagged, or serrated. The specific common name "Hoary Tansyaster" hints at these textured, slightly ragged leaves.
3. Glandular Stickiness and Scent
Sierra Fleabane: The leaves and stems are covered in fine, short, dry hairs that give it a grayish-green look but are not sticky.
Hoary Aster: The entire plant is heavily covered in a mix of gray hairs and sticky, glandular structures. If you touch a hoary aster, it will feel distinctly resinous or sticky and release a strong, pungent, herbal scent.
4. Growth Habit & Structure
Sierra Fleabane: A true, compact perennial that forms low, tight, matted cushions hugging the rocks to stay out of the wind.
Hoary Aster: Functions as a taprooted annual or short-lived perennial. It is much more upright, forming bushy, rigid, widely branching stems that can stand anywhere from 1 to 3 feet tall.
5. Flowering Season
Sierra Fleabane: Tends to bloom earlier in the mountain warm season, showing its peak colors from late spring through mid-summer.
Hoary Aster: A classic late-summer to autumn bloomer. It waits until the hottest, driest months (often August through October) to put on its vibrant purple display.
Documenting the Wildflowers in Mineral
Documenting the Wildflowers in Mineral
In preparation for the Wildflower Festival, we've been photographing the wildflowers around Mineral. Watch the album where we're keeping them to see how they progress throughout the season. We'll have a sheet with names and photos for the day of the Wildflower Festival. "I know the names of the flowers, but forget them, if I don't use them," says Stephanie Dennis. "That's why having an annual Wildflower Festival could be helpful. I've been noticing the little flowers more than ever since preparing for the Festival," added Lisa Chandler.
Have photos to add? Add to the folder or email mineralcalifornia@gmail.com.
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