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Samolus valerandi ssp parviflorus.jpg
S. valerandi
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Ericales
Family: Primulaceae
Genus: Samolus

Samolus (known as brookweed, or water pimpernel) is a widely distributed genus of about a dozen species of water-loving herbs. According to the APG III classification, this genus belongs to the Primulaceae family in the order Ericales. It was considered as closely related to a clade comprising the Theophrastaceae,[1] and was treated as part of that family or in its own monogeneric family, the Samolaceae. The APG III system does not recognize these families and instead includes all species formerly belonging to Theophrastaceae in the Primulaceae family.


The last complete taxonomic treatment of this genus recognizes the following species:[2][3]

Samolus valerandi is native to a very wide area across Europe, Africa, Asia, Australia, and the Americas;[4] the other species have more restricted ranges.


  1. ^ Caris PL, Smets EF (2004). "A floral ontogenetic study on the sister group relationship between the genus Samolus (Primulaceae) and the Theophrastaceae". American Journal of Botany. 91 (5): 627–643. doi:10.3732/ajb.91.5.627. PMID 21653418. 
  2. ^ Crusio WE (20 February 1982). "Het geslacht Samolus L". Communications of the Dutch Waterplant Society (in Dutch). 2: 13–25. 
  3. ^ Crusio WE (26 May 1984). "Notes on the genus Samolus L. (Primulaceae)". Communications of the Dutch Waterplant Society. 6: 13–16. 
  4. ^ "Distribution of Samolus valerandi L.". Naturhistoriska riksmuseet, Stockholm, Sweden. Retrieved 2009-03-08.