Streptanthus glandulosus subsp. hoffmanii
Hoffman's bristly jewelflower, Hoffman's Bristly Jewelflower
(c) Ken-ichi Ueda, some rights reserved (CC BY), uploaded by Ken-ichi Ueda · licence
Family: Brassicaceae · Type: Annual · Native
Conservation status: CNPS 1B.3
Streptanthus glandulosus subsp. hoffmanii (Hoffman's bristly jewelflower) is a native California annual in the Brassicaceae family.
Hoffman's bristly jewelflower is a rare (CNPS 1B.3) California native annual found in southwestern North Coast Ranges in serpentine outcrops at elevations around 125 meters. Flowering from May to July, this plant produces lavender to purple flowers 10 to 12 millimeters long with delicate rose-colored sepals. Growing with stems 15 to 45 centimeters tall, it is densely bristly at the base and becomes more sparsely hairy toward the top. Its cauline leaves are moderately bristly, with upper leaves flat and either entire or finely toothed. The plant's fruits spread or curve downward, creating an elegant silhouette against its serpentine habitat.
Identification and appearance
Key characters: Geographically isolated with 0 sympatric species
Habitat and range
Habitat: Serpentine outcrops
Elevation: 125 m
California counties: Mendocino, Sonoma
Bloom period
Streptanthus glandulosus subsp. hoffmanii blooms May-Jul.
Conservation status
CNPS 1B.3
How to tell it apart
vs Caulanthus: Seed pods are flattened like sword blades versus cylindrical tubes in Caulanthus.; vs Boechera: Robust plants often over 2.5 feet with large flowers (sepals 4-8mm) versus more delicate habit.; vs Claytonia: Mustard family with 4 petals and 6 stamens versus Claytonia with 5 petals.; vs Silene: Mustard family with seed pods versus Silene with inflated capsules and opposite leaves.; vs Lonicera: Herbaceous mustard with alternate leaves versus woody vine with opposite leaves.
Frequently asked questions
Is Streptanthus glandulosus subsp. hoffmanii native to California?
Yes. Streptanthus glandulosus subsp. hoffmanii is native to California (recorded as native).
When does Streptanthus glandulosus subsp. hoffmanii bloom?
Streptanthus glandulosus subsp. hoffmanii blooms May-Jul.
Where in California does Streptanthus glandulosus subsp. hoffmanii grow?
Streptanthus glandulosus subsp. hoffmanii occurs in Mendocino, Sonoma, at elevations of 125 m.
What plant family does Streptanthus glandulosus subsp. hoffmanii belong to?
Streptanthus glandulosus subsp. hoffmanii is in the Brassicaceae family, genus Streptanthus.
Is Streptanthus glandulosus subsp. hoffmanii rare or endangered?
Streptanthus glandulosus subsp. hoffmanii carries California Rare Plant Rank 1B.3, state rank S2.
Related species
Other California species in the same genus, family, or bioregion.
- Streptanthus glandulosus subsp. josephinensis — Josephine county jewelflower
- Streptanthus glandulosus subsp. niger — Tiburon jewelflower
- Streptanthus glandulosus subsp. pulchellus — Mount tamalpais bristly jewelflower
- Streptanthus glandulosus subsp. raichei — Raiche's jewelflower
- Streptanthus glandulosus subsp. secundus — One-sided jewelflower
- Streptanthus glandulosus subsp. sonomensis — Uncommon jewelflower
Sources: Jepson eFlora · CNPS Rare Plant Inventory · Index of California Plant Names · CalPhotos · CDFW CNDDB
Last updated 2026-09-30
Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, Cal-IPC, and more.