Hypericum perforatum ssp. perforatum

General:
Perennial herb from a rhizome; stems erect, much branched above, glabrous, 0.1-1.0 m tall.

Leaves:
Stem leaves lanceolate or oblanceolate, unstalked, obtuse, 1-3 cm long, 0.5-1.5 mm wide, glabrous with translucent glandular dots throughout and black marginal dots.

Flowers:
Inflorescence up to 100+ flowered; petals yellow, 8-10 mm long; sepals linear-lanceolate to lanceolate, abruptly sharp-pointed, 4-6 mm long; stamens 75-100, united basally into 3 groups; styles 3.

Fruits:
Membranous capsules, 5-8 mm long; seeds dark brownish, 1.0-1.3 mm long, pitted in longitudinal rows.

Source:  The Illustrated Flora of British Columbia