Stellaria angustifolia subsp. rotundisepala

Glabrous annual herb; stems erect, to 25 cm long, usually single stemmed. Leaves (3.5–)6–9.5(–13) mm long. Pedicles slender, (22–)27–40 mm long, erect in fruit. Sepals round to broadly elliptic, 1.5–2.1 mm long, obtuse, apex folded over to form a hood, sometimes the hood thickened; petals 2.4–3 mm long, bifid; stamens 10, filaments to 3 mm long. Seeds 2–5(–7), suborbicular; tubercules rounded, giving seeds a spiny appearance.