Taxon Report

Heteranthera dubia (Jacq.) MacMill.

water star-grass

Print Report

©2010 Louis-M. Landry

Classification


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

Ecology and Life History


Lifeform:	perennial herb (aquatic)
Blooming Period: Jul-Oct	Jul-Oct
Elevation:	30-1495 (100-4905)
General Habitats:	Marshes and swamps
Microhabitat:	Alkaline
Microhabitat Details:	Requires a pH of 7 or higher, usually in slightly eutrophic waters

Conservation Status


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

Occurrence Data from the CNDDB


Total Occurrences:	9
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	9

Location


California Endemic: False
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)

Threat List Data from the CNDDB


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

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:

Selected References

CRPR List Addition on 2013-10-10

Citation California Native Plant Society, Rare Plant Program. 2024. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 27 December 2024].