Erigeron biolettii
Streamside daisy, Streamside Daisy
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Family: Asteraceae · Type: Subshrub · Native
Conservation status: CNPS 3
Erigeron biolettii (Streamside daisy) is a native California subshrub in the Asteraceae family, recognized by distinctive for complete absence of ray flowers (discoid heads).
Streamside daisy is a California native perennial found in the Klamath Ranges and northern Coast Ranges in dry slopes and rocky river ledges at elevations below 1,100 meters. Flowering from June to September, this plant produces white flower heads with purple-tipped inner phyllaries in clusters 12 to 15 millimeters wide. Growing with ascending to erect stems 30 to 90 centimeters tall, it develops from a woody base and branches toward the stem tips. Its narrow oblanceolate leaves are 2 to 4 centimeters long, sparsely bristly with dense glandular surfaces. The plant forms multiple flower heads with distinctive glandular, graduated phyllary series.
Identification and appearance
Key characters: 34 sympatric species; distinctive for complete absence of ray flowers (discoid heads)
Habitat and range
Habitat: dry slopes, rocks, ledges along rivers
Elevation: < 1100 m
Bloom period
Erigeron biolettii blooms Jun-Sep.
Conservation status
CNPS 3
How to tell it apart
vs Bellis: Erigeron has double-layered pappus (outer scales + inner bristles); Bellis completely lacks pappus.; vs Symphyotrichum: Erigeron has double pappus (2 layers); Symphyotrichum has single layer of uniform bristles.; vs Corethrogyne: Erigeron has simple unbranched stems; Corethrogyne has branched stems.; vs Pseudognaphalium: Erigeron has flat button-like flower heads; Pseudognaphalium has woolly clustered heads without rays.; vs Artemisia: Erigeron has obvious ray petals around yellow disk; Artemisia lacks ray petals entirely.
Frequently asked questions
Is Erigeron biolettii native to California?
Yes. Erigeron biolettii is native to California (recorded as native).
When does Erigeron biolettii bloom?
Erigeron biolettii blooms Jun-Sep.
What plant family does Erigeron biolettii belong to?
Erigeron biolettii is in the Asteraceae family, genus Erigeron.
Is Erigeron biolettii rare or endangered?
Erigeron biolettii carries California Rare Plant Rank 3, state rank S3?.
What habitat does Erigeron biolettii grow in?
Erigeron biolettii grows in dry slopes, rocks, ledges along rivers.
Related species
Other California species in the same genus, family, or bioregion.
Sources: Jepson eFlora · CalPhotos · CDFW CNDDB
Last updated 2026-10-07
Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, Cal-IPC, and more.