Posidonia australis

Rhizomes and older stems covered with fibrous remains of decaying leaf-sheaths. Leaves 2 or 3(or 4) per shoot; sheaths overlapping for about one-third of their length, persistent; ligule 0.5–1 mm long; auricle 3–4 mm long; lamina (15–)20–50(–90) X 0.5–1.5(–2) cm. Inflorescence borne about the same height as, or extended above, the canopy of leaves on an axis 15–45(–60)cm long. Flowers (2–)4(–6) per spike. Stamens with anther connective ovate, extended beyond locules, persistent and bract-like at base of fruit.