Annual, much-branched, prostrate herb very similar to S. media. Leaves usually all petiolate, < 7 mm long. Flowers: sepals 2.0-3.5 mm long; petals absent or vestigial; stamens 1-3. Flowering time summer.
Like S. media but with a line of hairs down each internode, sepals 2-3.5 mm long, petals absent or vestigial, stamens 1-3.
Prostrate annual herb. Petals minute, shorter than sepals. Anthers 2 or 3. Flowers white.
Like S. media but sepals 2.0-3.5 mm long, petals absent or vestigial and stamens 1-3.