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Species · Flowering plants

Rigid Hornwort

Ceratophyllum demersum

691Records since 2000
AugustPeak month
65Counties with records
Least ConcernIUCN Red List

When it is recorded

Jan4
Feb13
Mar11
Apr41
May35
Jun77
Jul97
Aug183
Sep96
Oct30
Nov3
Dec4

GBIF records by month, 2000–2025 (all years combined).

Where it is recorded

#CountyNationRecordsShare
1Worcestershire England68
2Norfolk England44
3East Riding of Yorkshire England42
4Cambridgeshire England25
5Angus Scotland25
6Suffolk England22
7Surrey England13
8Northamptonshire England13
9Doncaster England13
10Powys Wales11
11North Lincolnshire England11
12York England10
13North Yorkshire England9
14Herefordshire, County of England9
15Kent England8
576 England34 Scotland43 Wales11 Northern Ireland

Records per county (GADM level 2) and per nation; one record can count towards several areas. 65 counties in all.

About this species

Records since 2000
691
Peak month
August
Counties with records
65
IUCN Red List
Least Concern
Scientific name
Ceratophyllum demersum
Group
Flowering plants
NBN Atlas records since 2000
5,135
Most recorded in
Worcestershire
Conservation designations
GB Red List (2001 IUCN criteria)
Kingdom
Plantae
Phylum
Tracheophyta
Class
Magnoliopsida
Order
Ceratophyllales
Family
Ceratophyllaceae
Genus
Ceratophyllum
Name with authority
Ceratophyllum demersum L.
Contributing datasets
32

Sources: GBIF occurrence data (CC0 / CC BY), JNCC Taxon Designations (OGL), NBN Atlas (open licences), Wikidata (CC0) · Wikidata Q157385 · GBIF 2882398