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Fraser'S Marsh St. Johnswort (Triadenum fraseri)


Triadenum fraseri is a perennial forb (an herb that flowers) can grow to heights of 1 foot (0.30 m) to 2 feet (0.61 m). The plant has blue-green (sometimes purple-tinged) stalkless, elliptical, opposite leaves that are typically 2.5 inches (6.4 cm) long and to 1.75 inches (4.4 cm) wide, with prominent, often red stems and veins.The plant displays clusters of a few to several flowers arising from leaf axils, at the end of branching stems. The pink five-petal flowers with green or purplish sepals that range from 0.25 inches (0.64 cm) to 0.75 inches (1.9 cm) wide when fully open (but they are rarely open). The flower typically appears closed like a bud. Each flower features 9 to 12 yellow stamens. The plant's fruit is a three-sectioned dark-red or orange pointed capsule, 0.25 inches (0.64 cm) to 0.5 inches (1.3 cm) long. Triadenum fraseri is typically in flower each year from July through September.The plant is autotrophic and employs C3 carbon fixation.The C3 plants originated during Mesozoic and Paleozoic eras and tend to thrive in areas where sunlight intensity is moderate, temperatures are moderate, and ground water is plentiful. C3 plants lose 97% of the water taken up through their roots to transpiration.

Taxonomic tree

  • Domain: Eukarya

    • Kingdom: Plantae

      • Phylum: Magnoliophyta

        • Class: Magnoliopsida

          • Order: Malpighiales

            • Family: Hypericaceae

              • Genus: Triadenum