Taxon Details

Brasenia schreberi

watershield

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Taxon Summary:

Brasenia schreberi, commonly known as watershield, is a perennial rhizomatous herb (aquatic) in the Cabombaceae that is found in California and elsewhere. It occurs within Marshes and swamps, growing at elevations from 0 to 2200 meters. Brasenia schreberi is ranked 2B.3, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Not very threatened in California.

Classification

Scientific Name: Brasenia schreberi J.F. Gmel.
Common Name: watershield
Family:	Cabombaceae
Element Code:	PDCAB01010
USDA Plants Symbol:	BRSC
Synonyms/Other Names:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	2B.3
Fed List:	None
State List:	None
Global Rank:	G5
State Rank:	S3
Other Status:	IUCN_LC
CRPR Changes: added to 2.3 on 2010-10-27
Add Date:	2010-10-27
Date Edited:	2023-06-06

Ecology and Life History

Lifeform: perennial rhizomatous herb (aquatic)

Blooming Period: Jun-Sep

Elevation:
0 - 2200 meters
0 - 7220 feet

General Habitats:

Marshes and swamps (freshwater)

Microhabitat Details:

Microhabitat:

Notes

Notes: Many occurrences historical; need field surveys. See Systema Naturae: Per Regna Tria Naturae 2(1):853 (1791) for original description.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	4
	Total EOs	% of EOs
EOs with Threat Listed:	3	7 %
Altered flood/tidal/hydrologic regime	1	2%
Development	1	2%
Non-native plant impacts	1	2%
Road/trail construction/maint.	1	2%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					43
A	B	C	D	X	U
6	1	0	0	4	32

Occurrence Status:
Historical >20 Years	28
Recent <=20 Years	15

Presence:
Presumed Extant	39
Possibly Extirpated	2
Presumed Extirpated	2

Location

California Endemic:

California Island:

States: Name (Code)
Alabama (AL), Alaska (AK), Arkansas (AR), California (CA), Connecticut (CT), Delaware (DE), Florida (FL), Georgia (GA), Idaho (ID), Illinois (IL), Indiana (IN), Iowa (IA), Kansas (KS), Kentucky (KY), Louisiana (LA), Maine (ME), Maryland (MD), Massachusetts (MA), Michigan (MI), Minnesota (MN), Mississippi (MS), Missouri (MO), Montana (MT), Nebraska (NE), New Hampshire (NH), New Jersey (NJ), New York (NY), North Carolina (NC), Ohio (OH), Oklahoma (OK), Oregon (OR), Pennsylvania (PA), Rhode Island (RI), South Carolina (SC), South Dakota (SD), Tennessee (TN), Texas (TX), Vermont (VT), Virginia (VA), Washington (WA), West Virginia (WV), Wisconsin (WI)

California Counties and Islands: Name (Code)
Butte (BUT), Calaveras (CAL), El Dorado (ELD), Fresno (FRE), Glenn (GLE), Lake (LAK), Lassen (LAS), Mendocino (MEN), Merced (MER), Nevada (NEV), Plumas (PLU), Sacramento (SAC), San Joaquin (SJQ), Shasta (SHA), Sierra (SIE), Siskiyou (SIS), Sonoma (SON), Sutter (SUT), Tehama (TEH), Trinity (TRI), Tulare (TUL), Tuolumne (TUO)

Quads: Name (Quad Code)
Annapolis (3812363), Balls Ferry (4012242), Bouldin Island (3812115)*, Bray (4112168), Bruceville (3812134), Buck Rock (3912288), Burbeck (3912344), Cahto Peak (3912365), Calaveritas (3812025), Canyondam (4012121), Chalk Mtn. (4012187), Chester (4012132), Childs Meadows (4012134), Cisco Grove (3912035), Clearlake Highlands (3812286), Clearlake Oaks (3912216), Courtland (3812135), Crescent Mills (4012018), Echo Lake (3812071), Emerald Bay (3812081), Fall River Mills (4112114), Finley Butte (4012137), Florence Lake (3711838), Fort Mountain (3812034), Fredonyer Pass (4012037), Greenville (4012028), Hogback Ridge (4012184), Jamison Ridge (3912362), Kelseyville (3812287), Kern Lake (3611834), Lake Eleanor (3711987), Lakeport (3912218), Laughlin Range (3912333), Laytonville (3912364), Llano Seco (3912158), Longvale (3912354), Meadow Valley (3912181), Merced (3712034), Moonlight Peak (4012027), Mt. Givens (3711931), Mt. Harkness (4012143), Murphys (3812024), Oak Run (4012261), Quincy (3912088), Rail Road Flat (3812035), Red Cinder (4012142), Sanborn Slough (3912138), Sattley (3912054), Stockton West (3712183), Upper Lake (3912228), Westwood East (4012038), Westwood West (4012131), Zenia (4012324)

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 Status Review:	Proposed Addition to CRPR 2.3, G5 / S2 (2010)
Species Account:	Brasenia schreberi account for potential Species of Conservation Concern evaluation (2021)

CNPS Rare Plant Inventory