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Hypericum kalmianum (Kalm's st. john's-wort)
Smith, R.W.

Hypericum kalmianum

Hypericum kalmianum L.

Kalm's St. John's-wort

Clusiaceae (Mangosteen Family)



USDA Native Status: L48 (N), CAN (N)

A low shrub with bright yellow flowers in small clusters at ends of 4-sided branches; bark papery, peeling when older.

The species and common names honor Peter Kalm, a student of Linnaeus, who discovered the plant in America around 1750. This is one of several shrubby St. John's-worts with yellow flowers and small axillary clusters of leaves. Many species of St. John's-wort are found throughout the South.


From the Image Gallery

6 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Perennial
Habit: Shrub
Fruit Type: Capsule
Size Notes: Up to about 3 feet tall.
Fruit: Brown

Bloom Information

Bloom Color: Yellow
Bloom Time: Jul , Aug


USA: DC , IL , IN , MI , NY , OH , WI
Canada: ON , QC
Native Distribution: Ontario and Quebec south to New York, Ohio, Indiana, Illinois, and Wisconsin.
Native Habitat: Rocky or sandy soil.

Growing Conditions

Light Requirement: Sun
Soil Moisture: Dry
Soil Description: Sandy loam


Conspicuous Flowers: yes

Mr. Smarty Plants says

Evergreen shrubs for Michigan
June 17, 2008
I'm seeking a small-medium, ornamental, fairly compact, evergreen shrub to complement my front yard woodland wildflower garden. I want a shrub that will flank both sides of my front porch steps. I wa...
view the full question and answer

National Wetland Indicator Status

This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1 (Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here for map of regions.

Web Reference

Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter

Additional resources

USDA: Find Hypericum kalmianum in USDA Plants
FNA: Find Hypericum kalmianum in the Flora of North America (if available)
Google: Search Google for Hypericum kalmianum


Record Modified: 2023-03-21
Research By: TWC Staff

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