Taxon Details

Chorizanthe robusta var. hartwegii

Scotts Valley spineflower

View Report Copy Link Calflora eFlora CCH CalPhotos iNaturalist

Taxon Summary:

Chorizanthe robusta var. hartwegii, commonly known as Scotts Valley spineflower, is a annual herb in the Polygonaceae that is found only in California. It occurs within Meadows and seeps (sandy), Valley and foothill grassland (mudstone, and Purisima outcrops), growing at elevations from 230 to 245 meters. Chorizanthe robusta var. hartwegii is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification

Scientific Name: Chorizanthe robusta Parry var. hartwegii (Benth.) Rev. & Morgan
Common Name: Scotts Valley spineflower
Family:	Polygonaceae
Element Code:	PDPGN040Q1
USDA Plants Symbol:	CHROH
Synonyms/Other Names:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	1B.1
Fed List:	FE (1994-02-04)
State List:	None
Global Rank:	G2T1
State Rank:	S1
Other Status:	SB_UCSC
CRPR Changes:
Add Date:	1994-01-01
Date Edited:	2022-12-06

Ecology and Life History

Lifeform: annual herb

Blooming Period: Apr-Jul

Elevation:
230 - 245 meters
755 - 805 feet

General Habitats:

Meadows and seeps (sandy)
Valley and foothill grassland (mudstone, Purisima outcrops)

Microhabitat Details:

Microhabitat:

Notes

Notes: Known only from Scotts Valley. Threatened by development, vehicles, and non-native plants. See C. robusta in TJM (1993). See Phytologia 67(5):357-360 (1989) for revised nomenclature, and Fremontia 24(4):8-11 (1996) for taxonomic discussion.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	4
	Total EOs	% of EOs
EOs with Threat Listed:	3	75 %
Development	3	75%
Non-native plant impacts	3	75%
Other	3	75%
Road/trail construction/maint.	1	25%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					4
A	B	C	D	X	U
0	3	0	0	0	1

Occurrence Status:
Historical >20 Years	1
Recent <=20 Years	3

Presence:
Presumed Extant	4
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Santa Cruz (SCR)

Quads: Name (Quad Code)
Felton (3712211), Laurel (3712118)

Notes:

Definitions of codes following a county and/or quad:
*		Presumed extirpated
(?)		Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.

Regional Map

Map

Presumed Extant

Click on quad for name. Hold Shift Key to use mouse scroll wheel

CNPS Rare Plant Inventory