Taxon Report

Calystegia vanzuukiae Brummitt & Namoff

Van Zuuk's morning-glory

Print Report

Classification


Scientific Name:	Calystegia vanzuukiae Brummitt & Namoff
Common Name:	Van Zuuk's morning-glory
Family:	Convolvulaceae
Element Code:	PDCON040Q0
USDA Plants Symbol:	CAVA
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial rhizomatous herb
Blooming Period: May-Aug	May-Aug
Elevation:	500-1180 (1640-3870)
General Habitats:	Chaparral, Cismontane woodland
Microhabitat:	Gabbroic, Serpentine
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.3
Global Rank:	G2Q
State Rank:	S2
State List:	None
Fed List:	None
Other Status:	BLM_S; SB_UCSC
CRPR Changes:	added to 1B.3 on 2014-07-16

Occurrence Data from the CNDDB


Total Occurrences:	13
Element Occurrence Ranks:
Excellent (A)	3
Good (B)	3
Fair (C)	1
Poor (D)	1
None (X)	0
Unknown (U)	5

Location


California Endemic: True
California Counties and Islands: Name (Code)
El Dorado (ELD), Placer (PLA)
Quads: Name (Quad Code)
Dutch Flat (3912027), Foresthill (3912017), Garden Valley (3812077), Georgetown (3812087), Michigan Bluff (3912016)

Threat List Data from the CNDDB


Threat List Total:	9
EOs with Threat Listed:	Total EOs	% of EOs
	9	69 %
Road/trail construction/maint.	8	61%
Non-native plant impacts	6	46%
ORV activity	4	30%
Recreational use (non-ORV)	2	15%
Dam/Inundation	2	15%
Foot traffic/trampling	2	15%
Logging	2	15%
Mining	1	7%
Other	1	7%

Notes



Known only from the Central Sierra Nevada foothills. Potentially threatened by mining, vehicles, and non-native plants. Probably a stabilized hybrid between C. stebbinsii and C. occidentalis ssp. occidentalis. See Aliso 31(1):15-18 (2013) for original description.
Threats:

Taxonomy:

Selected References

Proposed Addition to CRPR 1B.3, G2Q / S2 (2014)

Citation California Native Plant Society, Rare Plant Program. 2024. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 25 December 2024].