Hypericaceae2017-06-01T16:31:38+00:00

Hypericaceae: St John’s Wort Family

Creeping St John’s Wort – Hypericum anagalloides

Blooms:

June–Aug

Plant Height:

3–30 cm

Flower Size:

Small

Origin:

Native

Habitat:

Wet places

Notes:

A low-growing plant, spread by runners (stolons) and sometimes forming dense mats.  Flowers are small and (usually) golden yellow.  Leaves are green, sometimes red-tinged, oval to rounded and clasping the stem.

Klamath Weed – Hypericum perforatum subsp. perforatum

Blooms:

May–Aug

Plant Height:

3–12 dm

Flower Size:

Medium

Origin:

Europe

Invasive?

Yes – moderate

Habitat:

Open, disturbed areas, many communities

Notes:

An invasive weed which is poisonous to livestock. It is often found growing in large clumps. Each stem can bear many (25–100) bright yellow, 5-petaled flowers which often develop a row of tiny black dots along the petal margins. The leaves provide an important diagnostic feature; they appear to be perforated, the result of the presence of many small, clear oil glands. At first sight the leaves bear a resemblance to those of French Broom (Genista monspessulana) but the plants are unrelated.