Harmonia guggolziorum
Guggolz's harmonia
(c) Trevor Van Loon, some rights reserved (CC BY) · licence
Family: Asteraceae · Type: Herb · Native
Conservation status: CNPS 1B.1
Harmonia guggolziorum (Guggolz's harmonia) is a native California herb in the Asteraceae family.
Guggolz's harmonia is a rare (CNPS 1B.1) California native annual found on the eastern edge of the North Coast Ranges in serpentine slopes near Hopland, Mendocino County at elevations of 100 to 200 meters. Flowering from April to May, this plant produces white ray flowers 4 to 5 millimeters long with distinctive disk flowers clustered in erect heads. Growing 10 to 30 centimeters tall with an unbranched central stem where most leaves are concentrated, it has a distinctive growth pattern with branches supporting flower heads. Its leaves are primarily located on the central stem and just below the branches supporting flower heads, with a sparse, strategic placement. The flower heads feature 3 to 6 coarsely hairy phyllaries, with ray flowers surrounded by 8 to 13 disk flowers, some of which are bisexual.
Identification and appearance
Key characters: 0 sympatric species; geographically isolated
Habitat and range
Habitat: Serpentine slopes
Elevation: 100-200 m
California counties: Mendocino
Bloom period
Harmonia guggolziorum blooms Apr-May.
Conservation status
CNPS 1B.1
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 guggolziorum native to California?
Yes. Harmonia guggolziorum is native to California (recorded as native).
When does Harmonia guggolziorum bloom?
Harmonia guggolziorum blooms Apr-May.
Where in California does Harmonia guggolziorum grow?
Harmonia guggolziorum occurs in Mendocino, at elevations of 100-200 m.
What plant family does Harmonia guggolziorum belong to?
Harmonia guggolziorum is in the Asteraceae family, genus Harmonia.
Is Harmonia guggolziorum rare or endangered?
Harmonia guggolziorum carries California Rare Plant Rank 1B.1, state rank S1.
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.