kidney leaf mudplantain

Heteranthera reniformis
Aquatic
Alternate
Simple
White
Blue
Green

Distinguished by kidney-shaped leaves, non-rosette leaves on a stalk; flowers in spikes of 2-8, spikes about as long as the 0.8-5.5 cm long bract on one side (spathe); filaments of stamens with white hairs.

Common names 
Also known as: Mud Plantain,
Family 
Pontederiaceae
Deciduous 
No
Flowering time 
Year Round
Native/Exotic 
Exotic
Origin 
North and South America
Notifiable 
No
Council declaration 
Class R – Reduce populations
Known distribution 

Currently thought to be limited to South East Queensland and Northern NSW

Habitat 

Prefers shallow waterways and ponded pastures. Tends to be disturbed in flooding events leading to further dispersal.

Habit 

Mostly prostrate perennial to annual water plant

Impact and control methods 

This fast growing anchored aquatic weed quickly invades shallow water courses obstructing stream flow and threatenting infrastructure. Outcompetes native aquatic species forming dense monocultures and impacting on aquatic animal habitat.

Stem and leaves 

Stems submerged or prostrate on land. Leaves bright green kidney shaped and of two types, leaves without a stalk in a basal rosette, leaves on a stalk 2-13 cm long on trailing or immersed stems. Latter leaves on stems 1-4.5 cm long and 1-5 cm wide.

Flowers and fruits 

Inflorescence spike-like, axillary. Flowers with spreading white limbs 3-6.5 mm long and shorter upper limb yellow or green at base and mauve towards apex; lasting for a few hours. Flowers summer and autumn in temperate to subtropical areas, all year round in the tropics.

Reproduction and dispersal 

Reproduces both from seed and vegetative fragmentation, typically dispersed by water movement. Seeds thought to have prolonged viability when trapped in wet muds.

Similar species 

Mud Plantain closely resembles Water Hyacinth (Eichornia crassipes) in leaf form and habitat. Can be distinguised by its anchored, prostrate form as opposed to the free-floating upright form of water hyacinth and its non-distinct white flowers as opposed to water hyacinth showy purple and white flowers.