< BCP

Hypericum perforatum

Closeup of flowers

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 Profile for Hypericum perforatum (St. John's wort)
Identifying Characteristics
Habit:Erect
Flowers:Yellow, five petaled flowers approximately 20mm across occur between late Spring and early to mid Summer. The flowers appear in in broad cymes at the ends of the upper branches. The sepals are pointed, with glandular dots in the tissue. There are many stamens, which are united at the base into three bundles.
Foliage:Leaves exhibit obvious translucent dots when held up to the light, giving them a ‘perforated’ appearance, hence the plant's Latin name. The yellow-green leaves are sessile (having no stem), narrow, oblong leaves which are 12mm long or slightly larger.
Stem:Erect, branched in the upper section, and can grow to 1m high.
Life Cycle: Perennial
Similar Plants:Oenothera biennis which has four petals rather than five.
Recent Logs

Global data:
Temperate zone season(s): Early Summer, Mid Summer, Late Summer, Early Fall, Mid Fall

Regional data:
Southeastern Pennsylvania: (invasive or naturalized) June, July, August, September
New Hampshire: June, July, August , September, October
Manchester, England: November

Additional images:
Please contribute!
This page is a profile for the plant species Hypericum perforatum, used to collect records of where and when this plant was observed blooming, and for providing identification information for use in dichotomous keys. If you would like to help collect data for this or other plants, see Bloom clock project/How to Contribute for orientation.
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