Hypericum kalmianum L.
Kalm's St. John's-wort
Clusiaceae (Mangosteen Family)
USDA Symbol: hyka
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
Plant CharacteristicsDuration: Perennial
Fruit Type: Capsule
Size Notes: Up to about 3 feet tall.
Bloom InformationBloom Color: Yellow
Bloom Time: Jul , Aug
DistributionUSA: 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 ConditionsLight Requirement: Sun
Soil Moisture: Dry
Soil Description: Sandy loam
BenefitConspicuous Flowers: yes
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National Wetland Indicator Status
Web ReferenceWebref 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 resourcesUSDA: Find Hypericum kalmianum in USDA Plants
FNA: Find Hypericum kalmianum in the Flora of North America (if available)
Google: Search Google for Hypericum kalmianum
MetadataRecord Modified: 2023-03-21
Research By: TWC Staff