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Hypericum swinkianum

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Species of plant

Hypericum swinkianum
Scientific classification Edit this 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

  1. ^ 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.
  2. ^ "Hypericum swinkianum". Michigan Flora. Retrieved 2018-12-11.
  3. ^ Wilhelm, Gerould; Rericha, Laura (2017). Flora of the Chicago Region: A Floristic and Ecological Synthesis.
Hypericum
List of species
subg. Hypericum
Adenosepalum
Adenosepalum
Aethiopica
Caprifolia
Huber-morathii
Pubescens
Adenotrias
Androsaemum
Arthrophyllum
Ascyreia
Camplyosporus
Coridium
Crossophyllum
Drosocarpium
Elodeoida
Graveolentia
Hirtella
Platyadenum
Stenadenum
Humifusoideum
Hypericum
Erecta
Hypericum
Hypericum
Senanensia
Monanthema
Oligostema
Olympia
Origanifolia
Roscyna
Sampsonia
Taeniocarpium
Takasagoya
Triadenoides
Monospecific
subg. Brathys
Brathys
Brathys
Phellotes
Spachium
Styphelioides
Elodea
Myriandra
Ascyrum
Brathydium
Centrosperma
Pseudobrathydium
Suturosperma
Thornea
Trigynobrathys
Connatum
Knifa
Paleospecies
Taxon identifiers
Hypericum swinkianum
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