Hypericum swinkianum | |
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Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Clade: | Rosids |
Order: | Malpighiales |
Family: | Hypericaceae |
Genus: | Hypericum |
Section: | H. sect. Myriandra |
Subsection: | H. subsect. Centrosperma |
Species: | H. swinkianum |
Binomial name | |
Hypericum swinkianum G.Wilh. & L.Rericha, 2016 | |
Known occurrences of Hypericum swinkianum |
Hypericum swinkianum, known as Swink's St. John's wort, is a shrub in the St. John's wort family. It was named after Chicago Region botanist Floyd Swink (1921-2000).
Description
Swink's St. John's wort is a many-branched shrub up to 1.8 meters (5.9 ft) high. It has exfoliating bark. The leathery, oblong leaves reach 2 centimeters (3⁄4 in) in width and 5 centimeters (2.0 in) in length, with weakly revolute edges. The flowers are produced in terminal flowerheads known as dichasia. Each dichasium produces 7-31 bright yellow flowers, each with 5 petals and numerous yellow stamens. The capsules are 5-parted. In the Chicago Region, it blooms between July and August.
Hypericum swinkianum differs from the closely related Hypericum kalmianum by its notably larger vegetative features, flowerheads each averaging more than 7 flowers, and an affinity toward acidic rather than calcareous habitats.
Distribution and habitat
Swink's St. Johns wort is known to occur in sand flatwoods and acidic wet to wet-mesic sand prairies in the western Great Lakes region in the United States, including Illinois, Indiana, and Michigan. It is a highly conservative species with a coefficient of conservatism of 10 in the Chicago Region and in Michigan.
References
- ^ Wilhelm, Gerould; Rericha, Laura (2016). "A new species of Hypericum (Hypericaceae) and some new combinations in the vascular flora of the Chicago Region" (PDF). The Michigan Botanist. 55: 89–96.
- ^ "Hypericum swinkianum". Michigan Flora. Retrieved 2018-12-11.
- ^ Wilhelm, Gerould; Rericha, Laura (2017). Flora of the Chicago Region: A Floristic and Ecological Synthesis.
Taxon identifiers | |
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Hypericum swinkianum |