Imperforate St John's-wort - Hypericum maculatum

Description

Hairless erect plant with square, four lined but not winged stems, spreading and rooting at the base. Leaves opposite, unstalked, net veined mostly without translucent dots and edged with black dots. Flowers golden yellow, 18 to 20 mm in broad panicles. 

Similar Species

Other St.John's-worts. See ID Aids below.

Identification difficulty
ID guidance

Stems with 4 ridges, but not winged; square in cross section. Leaves with no (or very few) translucent glands (hold the leaf up to the light); black glands on leaves and petals, and sometimes sepals.

Identification aids

The St John's Wort (Hypericum) family are attractive, yellow-flowered perennials. They can look confusingly similar but can be distinguished by careful examination of key features. A hand-lens may be required (depending how good your eyesight is!). The leaf perforations are visible as translucent dots if the leaf is held up to the light.

Hypericum guide

 

Recording advice

A photo of the plant in its habitat; confirmation that leaves have no translucent dots

Habitat

Grass verges and rough grassland.

When to see it

June to September.

Life History

Perennial.

UK Status

Widespread in Britain, but sometimes local in distribution.

VC55 Status

Not common in Leicestershire and Rutland. In the 1979 Flora survey of Leicestershire it was found in 36 of the 617 tetrads.

In the current checklist (Jeeves, 2011) it is listed as subspecies obtusiusculum; Native; now nearly scarce. 

It is on the VC55 Rare Plant Register

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Leicestershire & Rutland Map

MAP KEY:

Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map