Hypericum kalmianum

Hypericum kalmianum
Scientific classification
Kingdom:Plantae
Clade:Angiosperms
Clade:Eudicots
Clade:Rosids
Order:Malpighiales
Family:Hypericaceae
Genus:Hypericum
Section:H. sect. Myriandra
Subsection:H. subsect. Centrosperma
Species: H. kalmianum
Binomial name
Hypericum kalmianum
Synonyms [1]
  • Norysca kalmiana (L.) K. Koch

Hypericum kalmianum, commonly called Kalm's St. Johns wort[2] or Kalm's St. Johnswort,[3] is a small shrub in the St. John's wort family. It was named after its discoverer, Swedish botanist Pehr Kalm (1715-1779).[2]

Description

Hypericum kalmianum is a slender shrub that grows to a height of 20–60 cm (7.9–23.6 in). Its bark is whitish and papery. It has ascending four-edged branches that bear two-edged branchlets. The crowded bluish-green leaves are linear to oblanceolate and 3–4.5 cm (1.2–1.8 in) long. One to ten flowers are borne on terminal and open corymbs, with each flower measuring 2–3.5 cm (0.79–1.38 in) wide. The leaf-like sepals are oblong and 5–15 mm (0.20–0.59 in) long. The ovoid capsules typically have five carpels and styles, though they can occasionally bear three, four, or six. The capsules are 7–10 mm (0.28–0.39 in) long and 4–7 mm (0.16–0.28 in) thick.[4]

The plant flowers between June and August.[5]

Distribution and habitat

Kalm's St. Johns wort is primarily found near the Great Lakes, including Ontario, Quebec, Illinois, Indiana, Michigan, New York, Ohio, and Wisconsin.[1] In the Chicago Region, it is a highly conservative species that occurs near Lake Michigan in calcareous sand prairies and marly pannés, and though rarely seen inland, can be found in prairie fens and mesic prairies.[2] It is classified as an endangered species in Illinois and threatened in Ohio.[3]

References

  1. 1 2 "Hypericum kalmianum". www.efloras.org. Retrieved 2018-02-16.
  2. 1 2 3 Wilhelm, Gerould; Rericha, Laura (2017). Flora of the Chicago Region: A Floristic and Ecological Synthesis.
  3. 1 2 "Hypericum kalmianum L." plants.usda.gov. Retrieved 2018-02-20.
  4. Merrit Lyndon Fernald (1970). R. C. Rollins, ed. Gray's Manual of Botany (Eighth (Centennial) - Illustrated ed.). D. Van Nostrand Company. p. 1011. ISBN 0-442-22250-5.
  5. "Hypericum kalmianum (Kalm's St. Johns wort): Plant Phenology". iNaturalist.org. Retrieved 2018-08-19.


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