Weeds - Goulburn Broken Catchment Management Authority

Restricted Weed
St Peter’s Wort
Description: Erect, branching herb to 1 m tall.
flowers: Yellow, 1-1.5 cm wide, in clusters at the end of
upper branches with 5 petals. Tiny black dots along the
edges. Occurring between late Spring and Summer.
fruit: 3-celled capsule, 5-10 mm long with many seeds.
leaves: Opposite, stem-clasping, light green, to 3 cm long
with visible veins and black dots along the edges.
stems: Prostrate at base becoming erect, green to reddish
brown with tiny black dots (glands). Branched, almost square
with wings along the edges.
Roots: Numerous rhizomes producing new plants.
Note: Differs from St John’s wort by having a square stem
and prostrate stems at the base.
similar Native species: Could be confused with native
Hypericum species, such as Matted St. John’s wort (H.
japonicum) or Small St. John’s wort (H. gramineum).
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Hypericum tetrapterum
(Square Stemmed St John’s Wort, Winged St John’s Wort)
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