Olympic St John's-wort - Hypericum olympicum
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Species Description
Rarely naturalised but scattered throughout the UK. Habitat includes: wasteland.
Stace 4:
Hypericum olympicum L. - Olympic St John's-wort.
Densely tufted with thin, woody, little-branched stems to 50cm; leaves 5-30mm, glaucous, narrowly oblong to narrowly elliptic, with many translucent glands; flowers 20-60mm across; petals 1.5-3x as long as sepals, bright yellow; (2n=18). Neophyte-naturalised; readily self-sowing on walls, paths and barish ground near gardens; scattered throughout most of Britain North to West Ross, County Wexford, County Waterford; Balkans.
Key:
- Stems glabrous; leaves glabrous to hairy
- Some (often few) glands on leaves; sepals and/or petals black
- Stems with 0-2 ridges; ridges not winged
- Leaves glabrous; petals bright yellow
- Stems woody at least at base and overwintering