Taxon Report

Acanthoscyphus parishii (Parry) Small var. abramsii (E.A. McGregor) Reveal

Abrams' oxytheca

Print Report

Taxon Summary

Acanthoscyphus parishii var. abramsii, commonly known as Abrams' oxytheca, is a annual herb in the Polygonaceae that is found only in California. It occurs within Chaparral (sandy, and shale), growing at elevations from 1143 to 2057 meters. Acanthoscyphus parishii var. abramsii is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Acanthoscyphus parishii (Parry) Small var. abramsii (E.A. McGregor) Reveal
Common Name:	Abrams' oxytheca
Family:	Polygonaceae
Element Code:	PDPGN0J041
USDA Plants Symbol:
Synonyms/Other Names:	Oxytheca parishii Parry var. abramsii (McGregor) Munz

Ecology and Life History


Lifeform:	annual herb
Blooming Period: Jun-Aug	Jun-Aug
Elevation:	1143-2057 (3750-6750)
General Habitats:	Chaparral
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G4?T1T2
State Rank:	S1S2
State List:	None
Fed List:	None
Other Status:	USFS_S
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	7
Element Occurrence Ranks:
Excellent (A)	1
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	6

Location


California Endemic: True
California Counties and Islands: Name (Code)
Santa Barbara (SBA), Ventura (VEN)
Quads: Name (Quad Code)
Big Pine Mtn. (3411966), Cuddy Valley (3411971), Figueroa Mtn. (3411968), Lockwood Valley (3411961), Reyes Peak (3411963), San Rafael Mtn. (3411967), Topatopa Mountains (3411951), Wheeler Springs (3411953)

Threat List Data from the CNDDB


Threat List Total:	1
EOs with Threat Listed:	Total EOs	% of EOs
	1	14 %
Road/trail construction/maint.	1	14%

Notes



See Harvard Papers in Botany 9(1): 144 (2004) for revised nomenclature, and Brittonia 32(1): 70-102 (1980) and Phytologia 66(4): 386-87 (1989) for taxonomic treatments.
Threats:

Taxonomy:

Selected References

Bulletin of the Torrey Botanical Club 36: 605 (1909)

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 29 November 2025].