Pilularia novae-hollandiae
Common names
pillwort
Biostatus
Native
Category
Vascular
Structural class
Ferns
Flower colours
No flowers
Distribution
Indigenous. New Zealand: North Island (Lake Whangape), South Island lakes and tarns. Also Australia (Victoria, South Australia, New South Wales and Western Australia).
Habitat
An aquatic or semi-aquatic plant found in mud or silt of shallow rivers and on the seasonally inundated margins of streams and rivers. Often found among grasses and sedges in damp mud, bogs and swamps.
Current conservation status
The conservation status of all known New Zealand vascular plant taxa at the rank of species and below were reassessed in 2022-2023 using the New Zealand Threat Classification System (NZTCS) – more information about this can be found on the NZTCS website. This report includes replaces all previous NZTCS lists for vascular plants. Previous assessments can be found here.
Please note, threat classifications are often suggested by authors when publications fall between NZTCS assessment periods – these interim threat classification statuses has not been assessed by the NZTCS panel.
- Conservation status of vascular plants in Aotearoa New Zealand, 2023. 2024. Peter J. de Lange, Jane Gosden, Shannel P. Courtney, Alexander J. Fergus, John W. Barkla, Sarah M. Beadel, Paul D. Champion, Rowan Hindmarsh-Walls, Troy Makan and Pascale Michel Department of Conservation. Source: NZTCS and licensed by DOC for reuse under the Creative Commons Attribution 4.0 International licence.
2023 | Not Threatened | Qualifiers: SO
Detailed taxonomy
Family
Marsileaceae
Synonyms
Calamistrum novae-zelandiae (Kirk) Kuntze; Pilularia novae-zelandiae Kirk; Calamistrum novae-hollandiae (A.Braun) Kuntze;
Endemic taxon
No
Endemic genus
No
Endemic family
No
Ecology
Wetland plant indicator status rating
Information derived from the revised national wetland plant list prepared to assist councils in delineating and monitoring wetlands (Clarkson et al., 2021 Manaaki Whenua – Landcare Research Contract Report LC3975 for Hawke’s Bay Regional Council). The national plant list categorises plants by the extent to which they are found in wetlands and not ‘drylands’. The indicator status ratings are OBL (obligate wetland), FACW (facultative wetland), FAC (facultative), FACU (facultative upland), and UPL (obligate upland). If you have suggestions for the Wetland Indicator Status Rating, please contact: [Enable JavaScript to view protected content]
OBL: Obligate Wetland
Almost always is a hydrophyte, rarely in uplands (non-wetlands).
Other information
NVS code
The National Vegetation Survey (NVS) Databank is a physical archive and electronic databank containing records of over 94,000 vegetation survey plots - including data from over 19,000 permanent plots. NVS maintains a standard set of species code abbreviations that correspond to standard scientific plant names from the Ngä Tipu o Aotearoa - New Zealand Plants database.
PILNOV
Chromosome number
2 n= c.40
Previous conservation statuses
2017 | Not Threatened | Qualifiers: SO
2012 | Not Threatened
2009 | At Risk – Naturally Uncommon | Qualifiers: SP
2004 | Not Threatened