Hypericum maculatum 斑點金絲桃

Common name: Imperforate St John's-wort
Scientific name: Hypericum maculatum 斑點金絲桃
Genus: Hypericum 金絲桃屬
Family: Hypericaceae 金絲桃科, St. John's wort family

Remarks: 

Origin: native

Date: 24th (& 27th Aug)

An erect, glabrous, rhizomatous perennial, can reach up to 60 cm. (27th Aug)

Another plant, but it is still young without flower. Photo enlarged below to see the details of the stem. (27th Aug)

Stem with 4 raised lines, square in section. (vs stem with 2 raised lines in Hypericum perforatum 貫葉金絲桃, 貫葉連翹, 聖約翰草, perforate St John's-wort) There are black dots on the stem.

Another plant, see again the stem with 4 raised lines, square in section. (see the left part of the stem above)

Note the black dots on the margin of the leaf.

Note the black dots on the margin of the underside of the leaf.

Leaves are narrowed to base, not clasping stem. 18 (27th Aug)
(vs leaves with abundant small yellowish translucent glandular dots in Hypericum perforatum 貫葉金絲桃, 貫葉連翹, 聖約翰草, perforate St John's-wort)

The inflorescence, enlarged below to see the flower bud.

Sepals and petals with black glands. Sepals are blunt. (vs sepals are acute in Hypericum perforatum 貫葉金絲桃, 貫葉連翹, 聖約翰草, perforate St John's-wort)

Side view of the flower.

Flower is bright yellow, about 2 cm across.

Flower with numerous stamens, 3 styles.

The underside of the flowers. Photo enlarged below to see the details.

Petals are longer than or equal to 2 times of sepals.

The fruits are forming, with withering stamens.