Taxon Report

Chorizanthe biloba Goodm. var. immemora Rev. & Hardham

Hernandez spineflower

Print Report

Taxon Summary

Chorizanthe biloba var. immemora, commonly known as Hernandez spineflower, is a annual herb in the Polygonaceae that is found only in California. It occurs within Chaparral, and Cismontane woodland, growing at elevations from 425 to 1115 meters. Chorizanthe biloba var. immemora is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Chorizanthe biloba Goodm. var. immemora Rev. & Hardham
Common Name:	Hernandez spineflower
Family:	Polygonaceae
Element Code:	PDPGN04025
USDA Plants Symbol:	CHBII
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: May-Aug(Sep)	May-Aug(Sep)
Elevation:	425-1115 (1395-3660)
General Habitats:	Chaparral, Cismontane woodland
Microhabitat:	Clay (sometimes), Gravelly (often), Serpentine (usually)
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G3T1T2
State Rank:	S1S2
State List:	None
Fed List:	None
Other Status:	BLM_S
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	12
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	12

Location


California Endemic: True
California Counties and Islands: Name (Code)
Monterey (MNT), San Benito (SBT)
Quads: Name (Quad Code)
Cholame Valley (3512073), Hepsedam Peak (3612037), Hernandez Reservoir (3612047), Lonoak (3612038), Priest Valley (3612026), Rock Spring Peak (3612048), San Benito (3612151), San Benito Mtn. (3612036), Topo Valley (3612141)

Threat List Data from the CNDDB


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

Notes



Known from approximately five occurrences. See Phytologia 66(2):137-139 (1989) for original description.
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 1 November 2025].