species 9,119 observations
Dwarf St. John's Wort
Hypericum mutilum
Field notes
Hypericum mutilum is a species of St. John's wort known by the common name dwarf St. John's wort. It is native to parts of North America and is present in other parts as an introduced species. It is an annual or perennial herb taking a multibranched erect form up to about 60 centimeters tall. The oval green leaves are one or two centimeters long and are covered in tiny glands. The inflorescence is a compound cyme of tiny flowers. H. mutilum subsp. mutilum and subsp. boreale have a diploid number of 16, and H. mutilum subsp. boreale can have a diploid number of 18.
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Caterpillars
Moths and butterflies raised on it
Gray Half-Spot, Setaceous Hebrew Character, Grey Pug Moth, Pallid Leafroller Moth
5
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Plant eaters
Animals that feed on it
Greater St. John's Wort Beetle, Ring-necked Duck, Alconeura macra
3
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Flower visitors
Pollinators and other flower visitors
Common Eastern Bumble Bee, Brown-belted Bumble Bee, Two-spotted Bumble Bee, Andrena gardineri
37
Range
Greener is more native, amber more introduced; paler is less certain. How this was decided
Key traits
- Layer
- Herbaceous plants
- Light
- Part shade
- Water use
- Medium
- Plant type
- Annual Perennial Wildflower
From USDA PLANTS and the Lady Bird Johnson Wildflower Center.