Scientific name:

Hypericum undulatum

Vernacular name:

St John's-wort, Wavy

Use the links below to jump to previous and next taxa in a text browser:
Hypericum maculatum subsp. obtusiusculum
Hypericum tetrapterum - St John's-wort, Square-stalked

Wavy St John's-wort

Scientific name: Hypericum undulatum Schousb. ex Willd.

Diagnostic features
Erect rhizomatous glabrous perennial.
Stems to 60cm, square in section, with narrow wings up to 0.25mm wide.
Leaves undulate, with abundant translucent glands.
Flowers 12-20mm across.
Petals bright yellow, red-tinged on lowerside.
Black glands on leaves, sepals and sometimes petals, sessile.

Chromosome number: 2n=16.

Habitat
Native; marshy fields and streamsides.

Distribution
Very local in Southwest England and West Wales.

This species is keyed out on Page 3872 in the Text Key.

Hypericum undulatum Schousb. ex Willd.

Wavy St John's-wort (English)
St John's-wort, Wavy [English]

Hypericum undulatum 2 (Flowering habit, picture taken in British Islands by R.E.N. Smith)
Hypericum undulatum 3 (Flowers, picture taken in British Islands by R.E.N. Smith)
Hypericum undulatum 4 (Flowering habit, picture taken in N Devon by J. Mason)
Hypericum undulatum 5 (Flowering, picture taken in Cards by C.A. Stace)

Description provides information about characters, distribution and habitat of the selected species or higher group. You can search using vernacular or scientific name.