Brookweed

Samolus
S. valerandi
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Asterids
Order:	Ericales
Family:	Primulaceae
Genus:	Samolus L.
Species
Samolus cinerascens Samolus dichondrifolius Samolus ebracteatus Samolus junceus Samolus porosus Samolus pyrolifolius Samolus repens Samolus junceus Samolus spathulatus Samolus subnudicaulis Samolus vagans Samolus valerandi

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, 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:

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

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Wikipedia