Taxon Details

Calystegia vanzuukiae

Van Zuuk's morning-glory

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Taxon Summary:

Calystegia vanzuukiae, commonly known as Van Zuuk's morning-glory, is a perennial rhizomatous herb in the Convolvulaceae that is found only in California. It occurs within Chaparral, and Cismontane woodland, growing at elevations from 500 to 1180 meters. Calystegia vanzuukiae is ranked 1B.3, Plants Rare, Threatened or Endangered in California and Elsewhere; Not very threatened in California.

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:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	1B.3
Fed List:	None
State List:	None
Global Rank:	G2Q
State Rank:	S2
Other Status:	BLM_S; SB_UCSC
CRPR Changes: added to 1B.3 on 2014-07-16
Add Date:	2014-07-16
Date Edited:	2023-06-06

Ecology and Life History

Lifeform: perennial rhizomatous herb

Blooming Period: May-Aug

Elevation:
500 - 1180 meters
1640 - 3870 feet

General Habitats:

Chaparral
Cismontane woodland

Microhabitat Details:

Microhabitat:

Gabbroic
Serpentine

Notes

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:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	9
	Total EOs	% of EOs
EOs with Threat Listed:	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%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					13
A	B	C	D	X	U
3	3	1	1	0	5

Occurrence Status:
Historical >20 Years	1
Recent <=20 Years	12

Presence:
Presumed Extant	13
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

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)

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

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CNPS Rare Plant Inventory