Species Details

Heteranthera dubia

water star-grass

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Classification

Scientific Name: Heteranthera dubia (Jacq.) MacMill.
Common Name: water star-grass
Family:	Pontederiaceae
Element Code:	PMPON03010
USDA Plants Symbol:	HEDU2
Synonyms/Other Names:

Conservation Status

CA Rare Plant Rank:	2B.2
Fed List:	None
State List:	None
Global Rank:	G5
State Rank:	S2
Other Status:	IUCN_LC
CRPR Changes: added to 2B.2 on 2013-10-10
Add Date:	2013-10-10
Date Edited:	2022-01-05

Ecology and Life History

Lifeform: perennial herb (aquatic)

Blooming Period: Jul-Oct

Elevation:
30 - 1495 meters
100 - 4905 feet

General Habitats:

Marshes and swamps (alkaline, still, slow-moving water)

Microhabitat Details: Requires a pH of 7 or higher, usually in slightly eutrophic waters

Microhabitat:

Alkaline

Notes

Notes: Many occurrences historical and some possibly extirpated; needs field surveys. See Observationum Botanicarum 3(9):59 (1768) for original description and The Metaspermae of the Minnesota Valley, pp. 138 (1892) by C. MacMillan for taxonomic treatment.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	2
	Total EOs	% of EOs
EOs with Threat Listed:	2	22 %
Erosion/runoff	1	11%
Recreational use (non-ORV)	1	11%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					9
A	B	C	D	X	U
0	0	0	0	0	9

Occurrence Status:
Historical >20 Years	8
Recent <=20 Years	1

Presence:
Presumed Extant	9
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
Alabama (AL), Arizona (AZ), Arkansas (AR), California (CA), Colorado (CO), Connecticut (CT), Delaware (DE), District of Columbia (DC), 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 Mexico (NM), New York (NY), North Carolina (NC), North Dakota (ND), Ohio (OH), Oklahoma (OK), Oregon (OR), Pennsylvania (PA), Sonora, Mexico (SO), 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), Colusa (COL), Marin (MRN), Modoc (MOD), San Francisco (SFO), San Mateo (SMT), Shasta (SHA), Sutter (SUT)

Quads: Name (Quad Code)
Alturas (4112045), Boles Meadows East (4112067), Canby (4112047), Fall River Mills (4112114), Hogback Ridge (4012184), Hunters Point (3712263), Inverness (3812217), Oakland West (3712273), Pennington (3912137), Point Bonita (3712275), Rattlesnake Butte (4112046), San Francisco North (3712274), San Francisco South (3712264), Sanborn Slough (3912138), Washington Mtn. (4112048), Williams (3912222)

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