This month we consider an interesting plant that turned up in our wetland and looks a bit like a cross between a rush and a small, leafless bamboo.

Species name: Eleocharis sphacelata, also known by the common names of Bamboo Sedge and Tall Spike Sedge.

Family: Cyperaceae

Origin and Distribution: Endemic to Australia, Papua New Guinea and New Zealand

Status: Relatively common in still or slow-moving fresh water. Sea level to sub alpine regions.

Growth Habit: Tall, round spikes growing up from an underground rhizome – to 12 mm diameter and 1.5-2 m above the water – may grow in water up to 5 m deep. Excellent bird, fish, and frog habitat.

Reproduction: Capped by a spike-like flower that is white to light green/brown. Flowers in spring-summer and sets seed thereafter.

Dispersal: By water, seeds typically germinate better after a dormancy period and may last up to 50 years in the soil.

Toxicity: None known.

Similar Plants: Some rushes. The common spike sedge Eleocharis acuta is quite similar, though smaller.

Further reading: Here

• Article and images by Greg Holland; distribution from Atlas of Living Australia.