Greater Water-parsnip (Sium latifolium)
Key Details
| Taxonomic Groups: | Vascular plant > flowering plant > Herbaceous plant |
| Red List Status: | Endangered (Not Relevant) [EN(nr)] |
| D5 Status: | Included in the baseline Red List Index for England (Wilkins, Wilson & Brown, 2022) |
| Section 41 Status: | (not listed) |
| Taxa Included Synonym: | (none) |
| UKSI Recommended Name: | Sium latifolium |
| UKSI Recommended Authority: | L. |
| UKSI Recommended Qualifier: | (none specified) |
| Red List Citation: | in Stroh et al., 2014 |
| Notes on taxonomy/listing: | (none) |
Criteria
| Question 1: | Does species need conservation or recovery in England? |
| Response: | Yes |
| Justification: | EN; but still widespread and probably under-recorded; a past and continuing decline though |
| Question 2: | Does recovery/ conservation depend on species-specific actions? |
| Response: | Yes |
| Justification: | Although will benefit from landscape-scale approaches, insight is needed into its reproductive and dispersal strategies |
| Question 3: | At a landscape scale, would the species benefit from untargeted habitat management to increase habitat mosaics, structural diversity, or particular successional stages? |
| Response: | Yes |
| Justification: | Would benefit from landscape-scale restoration of natural river functionality and wetland re-wildling |
Species Assessment
| Current step on the Species Recovery Curve (SRC): | 5. Remedial action identified |
| Recovery potential/expectation: | Medium-high |
| National Monitoring Resource: | Opportunistic - insufficient |
| Species Comments: | Although widespread, and declines largely understood, its fate cannot be predicted with confidence |
Key Actions
Key Action 1
Proposed Action: Carry out ecological investigation into requirements
Action targets: 4. Autecology and pressures understood
Action type: Scientific research
Duration: 2 years
Scale of Implementation: ≤ 50 sites
High priority sites:
Comments:
Key Action 2
Proposed Action: Based on Action 1, prepare a conservation strategy
Action targets: 5. Remedial action identified
Action type: Other (specify in comments)
Duration: 1 year
Scale of Implementation: National
High priority sites:
Comments: A thought-through strategy is needed that matches solutions to the threats
Key Action 3
Proposed Action: Foster good water quality in rivers through better catchment management and restrictions on point source pollution, particularly nitrates
Action targets: 5. Remedial action identified
Action type: Landscape/catchment/marine management
Duration: >10 years
Scale of Implementation: National
High priority sites: Everywhere
Comments:
Acknowledgment:
Data used on this website are adapted from Threatened species recovery actions 2025 baseline (JP065): Technical report and spreadsheet user guide (Natural England, 2025). Available here.