Taxon Report

Noccaea fendleri (A. Gray) Holub ssp. californica (S. Watson) Al-Shehbaz & M. Koch

Kneeland Prairie pennycress

Print Report

Classification


Scientific Name:	Noccaea fendleri (A. Gray) Holub ssp. californica (S. Watson) Al-Shehbaz & M. Koch
Common Name:	Kneeland Prairie pennycress
Family:	Brassicaceae
Element Code:	PDBRA2P041
USDA Plants Symbol:	NOFEC
Synonyms/Other Names:	Thlaspi montanum L. var. californicum (Wats.) P. Holmgren Thlaspi californicum Wats.

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: May-Jun	May-Jun
Elevation:	760-815 (2495-2675)
General Habitats:	Coastal prairie
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G5?T1
State Rank:	S1
State List:	None
Fed List:	FE
Other Status:	SB_UCSC
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	1
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	1
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	0

Location


California Endemic: True
California Counties and Islands: Name (Code)
Humboldt (HUM)
Quads: Name (Quad Code)
Iaqua Buttes (4012368)

Threat List Data from the CNDDB


Threat List Total:	3
EOs with Threat Listed:	Total EOs	% of EOs
	1	100 %
Development	1	100%
Grazing	1	100%
Road/trail construction/maint.	1	100%

Notes



Known from one occurrence at Kneeland Prairie; other reported occurrences are mis-identified T. montanum. Potentially threatened by road maintenance and airport expansion; voluntarily protected by landowner. See Proceedings of the American Academy of Arts and Sciences 17:365 (1882) for original description, and Memoirs of the New York Botanical Garden 21(2):80-81 (1971) for revised nomenclature.
Threats:

Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 9 January 2025].