Hypericum swinkianum

Hypericum swinkianum, known as Swink's St. John's wort,[3] is a shrub in the St. John's wort family. It was named after Chicago Region botanist Floyd Swink (1921-2000).[3]

Hypericum swinkianum
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
Known occurrences of Hypericum swinkianum[1][2]

Description

Swink's St. John's wort is a many-branched shrub up to 1.8 meters (5.9 ft) high.[1] 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.[3]

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.[1]

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.[1][3] It is a highly conservative species with a coefficient of conservatism of 10 in the Chicago Region[3] and in Michigan.[2]

gollark: Many American systems are weirdly broken in exciting ways.
gollark: But it's the ability to pay more money *specifically* for colleges, via loans and stuff.
gollark: The problem is that if people's ability to pay increasingly high prices is increased a lot, then the ability of colleges to charge high prices is also increased.
gollark: I think that if the price does go massively higher, people will just talk about how important it is and how everyone needs an education and stuff, and it'll be subsidized somehow and/or you'll just have to take out giant loans, instead of just not doing college.
gollark: I'm reading through the backlogs here.

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.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.