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Greater marsh (Triadenum walteri)


Herbs erect, to 10 dm, sometimes with ascending branches in distal 1/2+. Stems: internodes 4-lined at first, then terete. Leaves petiolate, petiole 2-15 mm; blade narrowly elliptic to narrowly oblong, 30-150 - 10-35 mm, base cuneate, apex rounded, gland dots laminar and intramarginal. Inflorescences interrupted spiciform-cylindric, 3-flowered from terminal node, sometimes with subsessile flowers or pedunculate triads and/or flowering branches from to 8 proximal nodes. Flowers 7-10 mm diam.; sepals narrowly oblong to narrowly elliptic or lanceolate, 3-5 - 1-1.5 mm, apex obtuse to rounded; petals narrowly obovate, 5-7 mm; stamen fascicles 3-5 mm; filaments 1/2+ connate; styles 0.8-1.2 mm. Capsules cylindric, 7-12 - 3-4 mm, apex subacute. Seeds 0.8-1.1 mm.

Taxonomic tree

  • Domain: Eukarya

    • Kingdom: Plantae

      • Phylum: Magnoliophyta

        • Class: Magnoliopsida

          • Order: Malpighiales

            • Family: Hypericaceae

              • Genus: Triadenum