Taxon Report

Howellanthus dalesianus (Constance) Walden & R. Patt.

Scott Mountain howellanthus

Print Report

Aaron Schusteff 2008

Classification


Scientific Name:	Howellanthus dalesianus (Constance) Walden & R. Patt.
Common Name:	Scott Mountain howellanthus
Family:	Hydrophyllaceae
Element Code:	PDHYD0C140
USDA Plants Symbol:	HODA2
Synonyms/Other Names:	Phacelia dalesiana

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: May-Jul(Aug)	May-Jul(Aug)
Elevation:	1025-2105 (3365-6905)
General Habitats:	Lower montane coniferous forest, Meadows and seeps, Subalpine coniferous forest, Upper montane coniferous forest
Microhabitat:	Serpentine
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.3
Global Rank:	G3
State Rank:	S3
State List:	None
Fed List:	None
Other Status:
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	46
Element Occurrence Ranks:
Excellent (A)	2
Good (B)	22
Fair (C)	4
Poor (D)	0
None (X)	0
Unknown (U)	18

Location


California Endemic: True
California Counties and Islands: Name (Code)
Shasta (SHA), Siskiyou (SIS), Trinity (TRI)
Quads: Name (Quad Code)
Carrville (4112216), Chicken Hawk Hill (4112214), Lake McCloud (4112221), Mount Eddy (4112234), Mumbo Basin (4112225), Scott Mountain (4112236), Seven Lakes Basin (4112224), South China Mtn. (4112235), Tangle Blue Lake (4112226), Whisky Bill Peak (4112215), Ycatapom Peak (4112217)

Threat List Data from the CNDDB


Threat List Total:	8
EOs with Threat Listed:	Total EOs	% of EOs
	38	83 %
Logging	26	56%
Grazing	11	23%
Road/trail construction/maint.	7	15%
Foot traffic/trampling	5	10%
Recreational use (non-ORV)	3	6%
Erosion/runoff	2	4%
ORV activity	2	4%
Other	1	2%

Notes



Possibly threatened by logging and grazing. See Phacelia dalesiana in TJM (1993) and TJM 2. See Leaflets of Western Botany 2:51 (1937) for original description, and Madroño 57(4):268-273 (2010) for taxonomic treatment.
Threats:

Taxonomy:

Selected References

USFS Potential Species of Conservation Concern Profile

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 5 January 2025].