Harmonia hallii
Hall's harmonia
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Family: Asteraceae · Type: Herb · Native
Conservation status: CNPS 1B.2
Harmonia hallii (Hall's harmonia) is a native California herb in the Asteraceae family.
Hall's harmonia is a rare (CNPS 1B.2) California native annual found in southern North Coast Ranges Interior in open sites and disturbed areas within serpentine chaparral at elevations of 500 to 1,000 meters. Flowering from April to June, this plant produces white ray flowers 2 to 5 millimeters long with disk flowers arranged in compact heads. Growing with delicate stems 5 to 18 centimeters tall, the plant features a central stem with proximal unbranched sections shorter than its flowering branches. Its leaves are densely clustered near the stem's distal regions, concentrated mostly on the central stem and immediately adjacent to flower-supporting branches. The flower heads are notable for having 3 to 6 coarsely hairy phyllaries, with ray and disk flowers creating a distinctive compact inflorescence.
Identification and appearance
Key characters: 2 sympatric species; key differentiator is leaf clustering pattern and pappus scale shape/length
Habitat and range
Habitat: Open sites, disturbed areas in serpentine chaparral
Elevation: 500-1000 m
California counties: Napa, Colusa, Lake, Tehama
Bloom period
Harmonia hallii blooms Apr-Jun.
Conservation status
CNPS 1B.2
How to tell it apart
vs Hippodamia: Harmonia is a plant with yellow flowers; Hippodamia is a ladybird beetle.; vs Coccinella: Harmonia is a flowering plant; Coccinella is a ladybird beetle.; vs Cycloneda: Harmonia is a plant genus; Cycloneda is a beetle genus.; vs Chilocorus: Harmonia is a composite flower; Chilocorus is a ladybird beetle.; vs Olla: Harmonia is a tarweed plant; Olla is a beetle.
Frequently asked questions
Is Harmonia hallii native to California?
Yes. Harmonia hallii is native to California (recorded as native).
When does Harmonia hallii bloom?
Harmonia hallii blooms Apr-Jun.
Where in California does Harmonia hallii grow?
Harmonia hallii occurs in Napa, Colusa, Lake, Tehama, at elevations of 500-1000 m.
What plant family does Harmonia hallii belong to?
Harmonia hallii is in the Asteraceae family, genus Harmonia.
Is Harmonia hallii rare or endangered?
Harmonia hallii carries California Rare Plant Rank 1B.2, state rank S2?.
Related species
Other California species in the same genus, family, or bioregion.
Sources: Jepson eFlora · CNPS Rare Plant Inventory · Index of California Plant Names · 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.