pg . 56
NQ DRY TROPICS WEED FREE
KNOBWEED
Hyptis capitata
KNOBWEED
FORBS
DESCRIPTION
This is an erect , aromatic , robust perennial herb .
Stems it has several quadrangular branching stems that grow between 1 and 2.5 metres high .
Leaves are bright green with irregularly toothed edges . They are arranged opposite each other and are widely spaced on the stems . The leaves grow up to 12 centimetres long and 5 centimetres wide , tapering at both ends .
Flowers are small and white in compact globular heads about 1.5 centimetres wide on stalks to 5 centimetres long in leaf axils . It flowers during autumn .
Fruit is a four-lobed capsule dividing into 4 seed-like nutlets which , when ripe , rattle if the plant is shaken .
Habitat knobweed grows in disturbed areas in full sunlight on heavy soils . It retains above average moisture levels . It usually occurs on roadsides , creek banks , cultivated headlands and run-down pastures .
Weed characteristics invasive in a large number of environments .
Dispersal seeds are spread by water and by adhering to animals , people and vehicles .
BIOSECURITY MATTER
This species is not listed under Queensland Legislation however it may be listed under local government law and control is highly recommended .
HOW TO ACT
Slashing and spraying of this weed are effective treatments . The spraying should be conducted at separate times but used in conjunction with slashing . Slashing on its own will not remove this weed . Correct grazing practices can also help to control this weed .