2 species
1 subspecies and varieties
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Arenaria paludicolamarsh sandwort
Distribution: Presumed extirpated from Washington; historically west of the Cascades crest along the coast. California to Central America.
Habitat: Swampy places, mostly along coast.
Origin: Native
Flowers: May-August
Arenaria serpyllifoliathyme-leaf sandwort
Distribution: Widely distributed across Washington; introduced in most of North America.
Habitat: Weed in various habitats.
Origin: Introduced from Europe
Flowers: May-July
var. serpyllifolia – thyme-leaf sandwort