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Smith, R.W.

Hypericum kalmianum

Hypericum kalmianum L.

Kalm's St. John's-wort

Clusiaceae (Mangosteen Family)

Synonym(s):

USDA Symbol: hyka

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

Distribution

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

Benefit

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

Region:	AGCP	AK	AW	CB	EMP	GP	HI	MW	NCNE	WMVE
Status:								FACW	FACW

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

Metadata

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

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