Taxon Report

Sidotheca caryophylloides (Parry) Reveal

chickweed oxytheca

Print Report

Taxon Summary

Sidotheca caryophylloides, commonly known as chickweed oxytheca, is a annual herb in the Polygonaceae that is found only in California. It occurs within Lower montane coniferous forest, growing at elevations from 1114 to 2600 meters. Sidotheca caryophylloides is ranked 4.3, Plants of Limited Distribution, A Watch List; Not very threatened in California.

Classification


Scientific Name:	Sidotheca caryophylloides (Parry) Reveal
Common Name:	chickweed oxytheca
Family:	Polygonaceae
Element Code:	PDPGN0J010
USDA Plants Symbol:
Synonyms/Other Names:	Oxytheca caryophylloides Parry

Ecology and Life History


Lifeform:	annual herb
Blooming Period: Jul-Sep(Oct)	Jul-Sep(Oct)
Elevation:	1114-2600 (3655-8530)
General Habitats:	Lower montane coniferous forest
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.3
Global Rank:	G4
State Rank:	S4
State List:	None
Fed List:	None
Other Status:	USFS_S
CRPR Changes:

Occurrence Data from the CNDDB


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

Location


California Endemic: True
California Counties and Islands: Name (Code)
Los Angeles (LAX), Riverside (RIV), San Bernardino (SBD), Ventura (VEN)
Quads: Name (Quad Code)
Acton (3411842), Big Bear Lake (3411628), Chilao Flat (3411831), Crystal Lake (3411737), East of Victory Pass (3311573), Fawnskin (3411638), Harrison Mtn. (3411722), Idyllwild (3311666), Keller Peak (3411721), Lake Arrowhead (3411732), Lake Fulmor (3311677), Mt. Baldy (3411726), Palm View Peak (3311665), Reyes Peak (3411963), San Jacinto Peak (3311676), Silverwood Lake (3411733)

Threat List Data from the CNDDB


Threat List Total:	0
EOs with Threat Listed:	Total EOs	% of EOs
	0	0 %

Notes



See Harvard Papers in Botany 9(1): 211 (2004) for revised nomenclature.
Threats:

Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2026. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 4 April 2026].