Rumex sagittatus Thunb.

• a scrambling creeper or low climber with short-lived stems that grow each year from long-lived underground tubers.
• its stems are prominently ribbed and green or reddish-green in colour.
• its alternately arranged leaves are distinctively arrow-shaped and are often slightly fleshy in nature.
• its small greenish flowers are inconspicuous, but its bright reddish-pink immature fruit are very distinctive.
• these papery, three-winged, fruit turn pale brown as they mature and are borne in large cascading clusters.

[From: Environmental Weeds of Australia]