Taxon Report

Deinandra halliana (Keck) B.G. Baldwin

Hall's tarplant

Print Report

Taxon Summary

Deinandra halliana, commonly known as Hall's tarplant, is a annual herb in the Asteraceae that is found only in California. It occurs within Chenopod scrub, Cismontane woodland, and Valley and foothill grassland, growing at elevations from 260 to 950 meters. Deinandra halliana is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Deinandra halliana (Keck) B.G. Baldwin
Common Name:	Hall's tarplant
Family:	Asteraceae
Element Code:	PDAST4R0C0
USDA Plants Symbol:	DEHA7
Synonyms/Other Names:	Hemizonia halliana Keck

Ecology and Life History


Lifeform:	annual herb
Blooming Period: (Mar)Apr-May	(Mar)Apr-May
Elevation:	260-950 (855-3115)
General Habitats:	Chenopod scrub, Cismontane woodland, Valley and foothill grassland
Microhabitat:	Alkaline (sometimes), Clay
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G3
State Rank:	S3
State List:	None
Fed List:	None
Other Status:	BLM_S; SB_CalBG/RSABG; SB_SBBG
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	69
Element Occurrence Ranks:
Excellent (A)	24
Good (B)	15
Fair (C)	4
Poor (D)	1
None (X)	0
Unknown (U)	25

Location


California Endemic: True
California Counties and Islands: Name (Code)
Fresno (FRE), Kern (KRN), Kings (KNG), Monterey (MNT), San Benito (SBT), San Luis Obispo (SLO)
Quads: Name (Quad Code)
Cholame (3512063), Cholame Valley (3512073), Chounet Ranch (3612066), Ciervo Mtn. (3612045), Domengine Ranch (3612033), Hernandez Reservoir (3612047), Hollister (3612174), Idria (3612046), Joaquin Rocks (3612034), Lillis Ranch (3612044), Lonoak (3612038), Packwood Creek (3512051), Panoche (3612057), Santa Rita Peak (3612035), Sawtooth Ridge (3512061), Sherman Peak (3612025), Smith Mountain (3612015), Tent Hills (3512072), The Dark Hole (3512083), Tres Pinos (3612173), Tumey Hills (3612056)

Threat List Data from the CNDDB


Threat List Total:	10
EOs with Threat Listed:	Total EOs	% of EOs
	14	20 %
Grazing	5	7%
Other	4	5%
Development	4	5%
Foot traffic/trampling	3	4%
ORV activity	3	4%
Road/trail construction/maint.	3	4%
Agriculture	2	2%
Erosion/runoff	2	2%
Recreational use (non-ORV)	1	1%
Non-native plant impacts	1	1%

Notes



Threatened by grazing and non-native plants. Appears only in unusually wet years. A synonym of Hemizonia halliana in The Jepson Manual. See Madroño 3(1):12 (1935) for original description, and Novon 9:462-471 (1999) for revised nomenclature.
Threats:

Taxonomy:

Selected References

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 February 2025].