Centaurium tenuiflorum (Hoffmanns. & Link) Fritsch

Annual herb. Stem usually branching from above middle, with 5–9 internodes below branches, 15–40 cm high. Basal leaves absent at flowering, or occasionally present in a superficial rosette. Stem leaves sessile, ovate to elliptic, becoming longer upwards, to 25 mm long, 10 mm wide, obtuse to subacute. Inflorescence usually a ±dense dichasium, often irregularly corymbose; branches divergent from axis at 15°–25°, rarely more; pedicels absent or to 2 mm long. Flowers (4-or) 5-merous, c. 7–9 mm diam. Calyx lobes to 6 mm long. Corolla magenta, rarely white; tube c. 7–9 mm long, not narrowly constricted; lobes c. 3–4.5 mm long. Stamens (4 or) 5; anthers 1–1.2 mm long, rarely more. Ovary 6–8 mm long; style 2–2.5 mm long; stigmas reniform to bluntly sagittate. Capsule c. 8–9 mm long. Seeds 0.25–0.35 mm diam., reticulate, yellow to reddish brown, sub-translucent.

Found in waste ground, lawns and pastures, and invasive of semi-naturalhabitats.