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Blue Ridge St. Johnswort (Hypericum mitchellianum)


Herbs erect, with rooting, creeping base, 2-6.5 dm. Stems: internodes usually 2-lined, sometimes 4-lined or not lined, with black glands scattered on and near lines or all over. Leaves spreading, usually sessile, rarely petiolate (to 0.8 mm); blade ovate-oblong to oblong or elliptic, 30-42(-52) - 8-22 mm, base subcordate to rounded, margins plane, apex usually rounded, rarely obtuse or subretuse, midrib with 4-5 pairs of branches, , black glands intramarginal (dense) and laminar (scattered). Inflorescences corymbiform to broadly pyramidal, (5-)13-61(-124)-flowered, . Flowers 15-20 mm diam.; sepals not imbricate, erect in fruit, lanceolate to ovate-elliptic or elliptic, subequal, (3-)3.6-4.6(-5.5) - 1-2 mm, apex acute to obtuse; petals golden yellow, narrowly obovate or oblanceolate to elliptic, 6-11 mm; stamens (37-)42-56(-62); anther gland black; styles 1.5-5 mm. Capsules ellipsoid to subglobose, 3-7 - 3-4.5 mm, with longitudinal vittae. Seeds not carinate, 0.7-0.9 mm; testa not seen. 2N = 16.

Taxonomic tree

  • Domain: Eukarya

    • Kingdom: Plantae

      • Phylum: Magnoliophyta

        • Class: Magnoliopsida

          • Order: Malpighiales

            • Family: Hypericaceae

              • Genus: Hypericum