Apium nodiflorum

Helosciadium nodiflorum (formerly Apium nodiflorum), commonly called fool's-water-cress,[1] is a flowering plant found in ditches or streams and native to western Europe. It is a low-growing or prostrate perennial with pinnate leaves which have a vague resemblance to those of watercress. Helosciadium nodiflorum has short-stalked umbels of very small white 5-petalled flowers which are opposite the leaves and grow from the side of the stem at the leaf axils. It blooms in July and August.[2][3]

Fool's-water-cress
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Apiales
Family: Apiaceae
Genus: Apium
Species:
A. nodiflorum
Binomial name
Apium nodiflorum

It is not a poisonous plant, but it could be easily confused with the allegedly poisonous lesser water parsnip – Berula erecta (Huds.) Coville. It is common throughout England, Wales and Ireland but is much less so in Scotland.[4]

Hybrids

There are a number of hybrids involving Helosciadium nodiflorum:

AHelosciadium nodiflorum, closeup of umbel flowers.

References
  1. "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-01-25. Retrieved 2014-10-17.
  2. Fool's-water-cress Wild flowers of Ireland. Accessed July 2011 Apium nodiflorum Fool's-water-cress]
  3. Apium nodiflorum (Fool's-water-cress) Online Atlas of British and Irish Flora. Accessed July 2011
  4. Apium nodiflorum Peter Llewellyn Wild Flowers of the British Isles, Accessed 2011
  5. Desjardins, Stuart D.; Leslie, Alan C.; Stace, Clive A.; Schwarzacher, Trude; Bailey, John P. (2015). "Intergeneric hybridisation between Berula erecta and Helosciadium nodiflorum (Apiaceae)". Taxon. 64 (4): 784–794. doi:10.12705/644.9. ISSN 1996-8175.
  6. Desjardins, Stuart D. (2016-09-01). "Molecular confirmation of Helosciadium × moorei ( H. inundatum × H. nodiflorum ; Apiaceae) from County Cork, Ireland". New Journal of Botany. 6 (2–3): 90–97. doi:10.1080/20423489.2016.1271294. ISSN 2042-3489. S2CID 90980061.
  7. Desjardins, Stuart D.; Shaw, Andrew G.; Webb, Judith A. (2020-02-26). "Hybridisation and introgression in British Helosciadium (Apiaceae)". British & Irish Botany. 2 (1): 27–42. doi:10.33928/bib.2020.02.027. ISSN 2632-4970.
  8. Rita, Juan; Capó, Miquel; Moragues, Eva; Bota, Josefina; Cursach, Joana (2018-02-01). "Hybridization processes in an introduced subpopulation of an endangered plant: Management strategies to guarantee the conservation of Helosciadium bermejoi (Apiaceae)". Journal for Nature Conservation. 41: 26–34. doi:10.1016/j.jnc.2017.10.006. ISSN 1617-1381.


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