Taxon Report

Hymenoxys odorata DC.

bitter hymenoxys

Print Report

© 2015 Richard Spellenberg

Classification


Scientific Name:	Hymenoxys odorata DC.
Common Name:	bitter hymenoxys
Family:	Asteraceae
Element Code:	PDAST530E0
USDA Plants Symbol:	HYOD
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: Feb-Nov	Feb-Nov
Elevation:	45-150 (150-490)
General Habitats:	Riparian scrub, Sonoran desert scrub
Microhabitat:	Sandy
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	2B.1
Global Rank:	G5
State Rank:	S2
State List:	None
Fed List:	None
Other Status:
CRPR Changes:	changed from 2.1 to 2B.1 on 2013-06-12 changed from 2 to 2.1 on 2012-02-15 added to 2 on 2008-11-20

Occurrence Data from the CNDDB


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

Location


California Endemic: False
California Counties and Islands: Name (Code)
Imperial (IMP), Riverside (RIV), San Bernardino (SBD)
Quads: Name (Quad Code)
Blythe (3311455), Blythe NE (3311465), Cibola (3311436), Cross Roads (3411422), Gene Wash (3411432), McCoy Wash (3311466), Palo Verde (3311446), Ripley (3311456), Thumb Peak (3311447)

Threat List Data from the CNDDB


Threat List Total:	1
EOs with Threat Listed:	Total EOs	% of EOs
	1	17 %
Development	1	16%

Notes



Most occurrences historical; need field surveys. Threatened by agriculture and development.
Threats:

Taxonomy:

Selected References

CRPR List Addition on 2008-11-20

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 7 January 2025].