Hypericum triquetrifolium Turra
Tangled hypericum is a State prohibited weed
State prohibited weeds are the highest category of declared noxious weeds in Victoria. By definition, they are either not yet in Victoria, or are here in small numbers, where their eradication is still possible.
All sightings should be reported to Agriculture Victoria immediately by calling 136 186 or emailing firstname.lastname@example.org.
Why is it important to report tangled hypericum sightings to Agriculture Victoria?
Tangled hypericum is a very competitive plant with the ability to eliminate most other vegetation. It can be easily spread throughout a paddock and to new locations by contaminated cultivation equipment.
Although unconfirmed, it is suspected to be poisonous to stock. It has a very high potential of infesting much of central Victoria.
It is native to Europe and the Mediterranean, and believed to have entered Victoria during the gold rush, where it has occurred at Tarnagulla since 1910. It can propagate by roots and rhizomes (underground stems) being spread by cultivation equipment and potentially also by seed.
How to identify tangled hypericum
Tangled hypericum is an erect perennial herb to 45 cm tall with many tangled branches. It reproduces from rhizomes and seed. It could invade open woodlands and agricultural land.
Arrowhead-shaped leaves (5–15 mm long) are arranged opposite each other along much-branched stems. Stems and leaves both have minute black glands, while only the leaves have translucent oil glands.
Short-stalked yellow flowers occur in clusters at branch ends in summer. Each flower (1–1.5cm wide) has five petals.
The fruit (3–4 mm long) is a capsule with three compartments. It is closely related to the common weed, St John's Wort (H. perforatum), which tends to be taller (up to 1.2 m) and has larger flowers (1–3 cm).
What should you do if you find tangled hypericum?
If you think you have seen tangled hypericum, please contact Agriculture Victoria on 136 186 or send an email to email@example.com.
Please do not attempt to treat or dispose of this weed yourself. Agriculture Victoria will treat, remove and dispose of tangled hypericum safely, at no cost to the land owner.