Ivesia paniculata
Ash creek ivesia, Ash Creek Ivesia
(c) Tom Hilton, some rights reserved (CC BY), uploaded by Tom Hilton · licence
Family: Rosaceae · Type: Herb · Native
Conservation status: CNPS 1B.2
Ivesia paniculata (Ash creek ivesia) is a native California herb in the Rosaceae family, recognized by tiny petals and 5 stamens diagnostic.
Ash creek ivesia is a rare (CNPS 1B.2) California native perennial found in the Ash Valley and northern-central Lassen County in shallow, rocky sagebrush areas at elevations of 1,400 to 1,800 meters. Flowering from May to July, this plant produces white to pale yellow flowers in loose clusters 10 to 20 millimeters wide, with delicate blossoms 4 to 6 millimeters across. Growing with prostrate stems 5 to 15 centimeters long, it forms a matted, gray-green plant with a much-branched caudex. Its finely divided leaves have 8 to 15 leaflets on each side, with tiny obovate lobes less than 2 millimeters long, and dense strigose sheath bases. The fruit is small, smooth, and brown, measuring 1 to 1.5 millimeters in length.
Identification and appearance
Key characters: 9 sympatric species; tiny petals and 5 stamens diagnostic
Habitat and range
Habitat: Shallow, rocky soil, open sagebrush
Elevation: 1400-1800 m
Bloom period
Ivesia paniculata blooms May-Jul.
Conservation status
CNPS 1B.2
How to tell it apart
vs Achillea: Ivesia has rose-like flowers with separate petals; Achillea has composite flower heads with ray and disk flowers.; vs Potentilla: Ivesia has cylindrical bottlebrush leaves with 4-80 tiny leaflets per side; Potentilla has flat leaves with spread-out leaflets.; vs Horkelia: Ivesia has cylindrical leaves with overlapping leaflets; Horkelia has flat leaves with 2-15 distinct, separated leaflets.; vs Eremogone: Ivesia has compound bottlebrush leaves; Eremogone has simple, needle-like or thread-like leaves.; vs Cryptantha: Ivesia has rose-family flowers with separate petals; Cryptantha has fused tubular corollas typical of borages.
Frequently asked questions
Is Ivesia paniculata native to California?
Yes. Ivesia paniculata is native to California (recorded as native).
When does Ivesia paniculata bloom?
Ivesia paniculata blooms May-Jul.
What plant family does Ivesia paniculata belong to?
Ivesia paniculata is in the Rosaceae family, genus Ivesia.
Is Ivesia paniculata rare or endangered?
Ivesia paniculata carries California Rare Plant Rank 1B.2, state rank S2.
What habitat does Ivesia paniculata grow in?
Ivesia paniculata grows in Shallow, rocky soil, open sagebrush.
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.