Taxon Report

Scutellaria holmgreniorum Cronq.

Holmgren's skullcap

Print Report

Taxon Summary

Scutellaria holmgreniorum, commonly known as Holmgren's skullcap, is a perennial rhizomatous herb in the Lamiaceae that is found in California and elsewhere. It occurs within Great Basin scrub, and Pinyon and juniper woodland, growing at elevations from 1310 to 1735 meters. Scutellaria holmgreniorum is ranked 3.3, Plants About Which We Need More Information, A Review List; Not very threatened in California.

Classification


Scientific Name:	Scutellaria holmgreniorum Cronq.
Common Name:	Holmgren's skullcap
Family:	Lamiaceae
Element Code:	PDLAM1U1C0
USDA Plants Symbol:
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial rhizomatous herb
Blooming Period: May-Jul	May-Jul
Elevation:	1310-1735 (4300-5695)
General Habitats:	Great Basin scrub, Pinyon and juniper woodland
Microhabitat:	Clay, Volcanic
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	3.3
Global Rank:	G3Q
State Rank:	S3
State List:	None
Fed List:	None
Other Status:
CRPR Changes:	changed from 4.3 to 3.3 on 2013-02-01

Occurrence Data from the CNDDB


Total Occurrences:	11
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	11

Location


California Endemic: False
California Counties and Islands: Name (Code)
Lassen (LAS)
Quads: Name (Quad Code)
Al Shinn Canyon (4012061), Five Springs (4012052), Karlo (4012053), Litchfield (4012044), Shaffer Mtn. (4012043), Shinn Mtn. (4012062), Snowstorm Mtn. (4012063)

Threat List Data from the CNDDB


Threat List Total:	1
EOs with Threat Listed:	Total EOs	% of EOs
	1	9 %
Grazing	1	9%

Notes



Previously on List 4.3. Taxonomic distinctiveness from S. nana is uncertain; needs further study. Some noted differences of S. holmgreniorum include: relatively elongate stems (S. nana is shorter and more compact), elongate inflorescences (S. nana has a very short, compact inflorescence), and may or may not have some hairs gland-tipped (S. nana never has gland-tipped hairs). On watch list in NV. A synonym of S. nana in TJM (1993) and TJM 2. See Brittonia 33(3):449-450 (1981) for original description.
Threats:

Taxonomy:

Selected References

CRPR List Deletion on 2013-02-01

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 6 November 2025].