Thunbergia annua, T fragrans and T laurifolia
Thunbergia laurifolia is a vigorous twining perennial vine.Thunbergia fragrans is a small vine with slender climbing stems.
Leaves are arranged opposite each other on the stem. The Thunbergia laurifolia has an oval narrowing to a pointed tip, up to 15 centimetres long and 10 centimetres wide. Smaller leaves are usually smooth-edged. The leaves of Thunbergia fragrans have entire to finely toothed sinuate margins. They are 5 to 10 centimetres long and have a blade ovate to arrowhead shape.
Flowers on the Thunbergia laurifolia are pale blue tubular with yellow throat petals up to 8 centimetres long. It flowers all year round. Thunbergia fragrans has white flowers that are 3 centimetres long and 5 centimetres wide.Thunbergia annua is an erect, annual herb which grows up to 35 centimetres high. The leaves are smooth and arranged in opposite pairs along the stem. Thunbergia annua has not been found in Australia to date.
Habitat occurs mostly along riparian zones and coastal streams.
Weed characteristics it climbs and blankets native vegetation often pulling down mature trees with its weight. It limits natural growth of lower layers of vegetation. It spreads quickly, and the large tubers may cause damage to structures.
Dispersal occurs when root pieces are transported along river banks during floods. It is also dispersed in earth removed for fill or other soil use.
These species are Class 1 declared plants under Queensland legislation.
How to act
A broad leaf herbicide is effective on this weed. Cut stumping can be used to allow access to large infestations. Hand pulling of plant material will usually require follow up foliar spraying of regrowth. Care should be taken to monitor site as underground tuberous root system can often need direct injection of herbicide to completely control infestation.
Refer to Weed Control Methods.
This is a legacy website. Content is not being updated but is kept as an archive.
Updated NRM information is now held in the NQ Dry Tropics NRM Information Portal at http://nrm.nqdrytropics.com.au/.
while corporate information about NQ Dry Tropics is held on our main website at http://www.nqdrytropics.com.au