Streptanthus glandulosus subsp. secundus
One-sided jewelflower
(c) Ken-ichi Ueda, some rights reserved (CC BY), uploaded by Ken-ichi Ueda · licence
Family: Brassicaceae · Type: Herb · Native
Streptanthus glandulosus subsp. secundus (One-sided jewelflower) is a native California herb in the Brassicaceae family, recognized by one-sided inflorescence and dentate distal leaves diagnostic.
One-sided jewelflower is a California native annual found in southern North Coast Ranges, southwestern North Coast Ranges, and northwestern San Francisco Bay area on rocky, open slopes and forest openings at elevations of 100 to 1,200 meters. Flowering from April to June, this plant produces green-white flowers with lavender to purple bases and purple-veined petals 12 to 16 millimeters long. Growing with stems 15 to 93 centimeters tall, densely stiff-hairy near the base and sparsely hairy toward the top, it develops a distinctive one-sided flowering axis. Its cauline leaves are densely to moderately hairy, with upper leaves showing dentate edges. The fruit is uniquely recurved, spreading to reflexed, and appears glabrous.
Identification and appearance
Key characters: 5 sympatric species - one-sided inflorescence and dentate distal leaves diagnostic
Habitat and range
Habitat: Rocky, open slopes, forest openings
Elevation: 100-1200 m
California counties: Sonoma, Marin
Bloom period
Streptanthus glandulosus subsp. secundus blooms Apr-Jun.
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. secundus native to California?
Yes. Streptanthus glandulosus subsp. secundus is native to California (recorded as native).
When does Streptanthus glandulosus subsp. secundus bloom?
Streptanthus glandulosus subsp. secundus blooms Apr-Jun.
Where in California does Streptanthus glandulosus subsp. secundus grow?
Streptanthus glandulosus subsp. secundus occurs in Sonoma, Marin, at elevations of 100-1200 m.
What plant family does Streptanthus glandulosus subsp. secundus belong to?
Streptanthus glandulosus subsp. secundus is in the Brassicaceae family, genus Streptanthus.
What habitat does Streptanthus glandulosus subsp. secundus grow in?
Streptanthus glandulosus subsp. secundus grows in Rocky, open slopes, forest openings.
Related species
Other California species in the same genus, family, or bioregion.
Sources: Jepson eFlora · Index of California Plant Names · CalPhotos
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.