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Hypericum forrestii (Chitt.) N. Robson

Brief Summary

    Hypericum forrestii: Brief Summary
    provided by wikipedia

    Hypericum forrestii is a species of flowering plant in the family Hypericaceae native to Yunnan and Sichuan provinces in China, and northeastern Myanmar. It is a semi-evergreen shrub growing to 1.2 m (4 ft) tall by 1.5 m (5 ft) broad, with oval leaves which turn red in autumn, and bowl-shaped yellow flowers with prominent stamens in late summer.

    Common names include Forrest's tutsan and Forrest's St. John's wort.

    It has been recorded as a garden escape in locations in the British Isles, and as an invasive species. It may be under-recorded due to confusion with other hypericums such as Hypericum 'Hidcote'.

    This plant has gained the Royal Horticultural Society's Award of Garden Merit. It was named in honour of George Forrest (1873-1932), who discovered it.

Comprehensive Description

Distribution

    Distribution
    provided by eFloras
    WC Sichuan (Kangding, Tianquan), N and SW Yunnan [NE Myanmar].

Morphology

    Description
    provided by eFloras
    Shrubs, 0.3-1.5 m tall, bushy; branches erect or somewhat spreading. Stems 4-angled and slightly ancipitous when young, soon terete; internodes 1-4.5(-6) cm, usually shorter than leaves. Leaves with petiole 0.5-2 mm, rather broad; blade lanceolate or triangular-ovate to ± broadly ovate, 2.5-3(-6) × 0.9-3.2(-3.5) cm, thickly papery, abaxially paler but not glaucous; laminar glands short streaks and dots; abaxial glands dense, especially near midvein; main lateral veins 4- or 5-paired, tertiary reticulation obscure or invisible; base broadly cuneate to rounded, apex obtuse to rounded or slightly retuse. Inflorescence 1- to ca. 20-flowered, from 1(or 2) nodes, nearly flat-topped; bracts lanceolate or ± leaflike, persistent. Pedicels 4-10 mm. Flowers (2.5-)3.5-6 cm in diam., ± deeply cupped; buds broadly ovoid, apex obtuse to rounded. Sepals erect, subequal to equal, ovate or ± broadly elliptic to subcircular, 6-9 × 3-8 mm; laminar glands lines, ± interrupted distally; margin entire or finely eroded-denticulate toward apex with margin often hyaline, apex rounded or rarely subapiculate. Petals golden yellow, broadly obovate, 1.8-3 × 1.1-2.5 cm, 3-3.5 × as long as sepals; margin entire or remotely glandular-subdenticulate; apiculus rounded. Stamen fascicles each with 40-65 stamens, longest 1-1.5 cm, 0.4-0.6 × as long as petals. Ovary broadly ovoid, (4.5-)6-8 × 4-4.5 mm; styles 4-7 mm, 0.7-0.9(-1) × as long as ovary, free, suberect, outcurved near apex. Capsule ± broadly ovoid, 1.2-1.8 × 0.8-1.4 cm. Seeds dark reddish brown, 1.2-1.7 mm, distally slightly carinate or winged; testa scalariform-reticulate. Fl. May-Sep, fr. Aug-Oct. 2n = 36, 38.

Diagnostic Description

    Synonym
    provided by eFloras
    Hypericum patulum Thunberg var. forrestii Chittenden, J. Roy. Hort. Soc. 48: 234. 1923; H. patulum f. forrestii (Chittenden) Rehder.

Habitat

    Habitat
    provided by eFloras
    Open stony situations on hillsides, sometimes beside streams, at Pinus forest margins; 1500-3000(-4000) m.