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Hypericum mutilum

Hypericum mutilum L.

Hypericum mutilum L. var. latisepalum Fernald

Hypericum mutilum L. var. parviflorum (Willd.) Fernald

Dwarf St. John’s-wort

KingdomPlantaePlants, but not fungi, lichens, or algae (from Stearn’s Botanical Latin)
SubkingdomTracheobiontaVascular plants—plants with a “circulatory system” for delivering water and nutrients
DivisionMagnoliophytaFlowering plants, also known as angiosperms
ClassMagnoliopsidaDicotyledons—plants with two initial seed leaves
SubclassRosidaeRoses, legumes, proteas, dogwoods, hydrangeas, mistletoes, euphorbias, grapes, many more
OrderMalpighialesA broad group encompassing 16,000 species
FamilyHypericaceaeSt. John’s Wort family
GenusHypericumFrom ancient Greek hyper, “above,” and eikon, “picture,” from an old practice of putting flowers above a picture to ward off evil spirits
SpeciesmutilumDivided as though torn, said of some leaves

About plant names...

Dwarf St. John’s wort is native to portions of Europe and North America.

Identification: Plants are 4-18" (10-45 cm) tall, sometimes up to 31" (79 cm), heavily branched, with a shrublike habit. Branches may be 4-angled or smooth, tapering, and sometimes winged. Leaves are roughly oval in shape, and attached directly to the stem (sessile). They are opposite, unlobed, ½-1½" (1.3-3.8 cm) long and ¼-¾" (6.3-19 mm) across. Flowers are ¼" (6.3 mm) in size, yellow or yellow-orange, with five petals and 5-15 stamens. Beneath the petals of each flower there are somtimes green bracts that are narrower but roughly the same length, one for each petal. Blooms from July to October. Fruits are ¹/₁₆-⅛" (2-3.5 mm) in length.

Medical: Hypericin, a component all in species of St. John’s wort, has antidepressant properties. It can also cause photosensitivity if it is handled or ingested.

Below is a comparison of some species of St. John’s wort:

 

Hypericum mutilum (Dwarf St. John’s-wort)

7/19/2012 · Beaver Brook Association Conservation Lands, Rte. 130, Hollis, NH
≈ 8 × 5" (19 × 13 cm) ID is uncertain

Hypericum mutilum (Dwarf St. John’s-wort)

8/3/2012 · Bemis Rd Conservation Area, Pepperell, MA
≈ 5 × 3½" (13 × 9.2 cm) ID is uncertain

Hypericum mutilum (Dwarf St. John’s-wort)

7/19/2012 · Beaver Brook Association Conservation Lands, Rte. 130, Hollis, NH
≈ 5 × 3½" (13 × 9.2 cm) ID is uncertain

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Hypericum mutilum

Hypericum perforatum
Common Name

Dwarf St. John’s-wort

St. John’s Wort
Plant 4-18" (10-45 cm) tall, sometimes up to 31" (79 cm), heavily branched, with a shrublike habit. Branches may be 4-angled or smooth, tapering, and sometimes winged. Less than 3' (91 cm) in height.
Flowers ¼" (6.3 mm) in size, yellow or yellow-orange, with five petals and 5-15 stamens. Beneath the petals of each flower there are somtimes green bracts that are narrower but roughly the same length, one for each petal. Blooms from July to October. Bright yellow, star-shaped, with five petals and many yellow stamens about the length of the petals. Petals have serrated edges and small black dots on the serrations. Flowers are up to ⅞" (2.5 cm) across.
Leaves Roughly oval in shape, and attached directly to the stem (sessile). They are opposite, unlobed, ½-1½" (1.3-3.8 cm) long and ¼-¾" (6.3-19 mm) across. Oval, about ⅜" (1.2 cm) long, with smooth edges, occurring in opposing pairs.
Fruit ¹/₁₆-⅛" (2-3.5 mm) in length.  
Range/ Zones

Habitats Sandy forest floodplains, sandy swamps, moist to wed sandy prairies; damp, sandy, acidic areas in general  
Type Wild Wild
Occurrence   Common, sometimes invasive

 

Online References:

Hypericum mutilum at Illinois Wildflowers

Hypericum mutilum on Missouriplants.com

Hypericum mutilum on Southeastern Flora, the Southeastern U.S. Plant Identification Resource

Hypericum mutilum at the Lady Bird Johnson Wildflower Center

Hypericum mutilum on Discover Life

Hypericum mutilum on biology.burke.washington.edu

Hypericum mutilum on luirig.altervista.org

Hypericum mutilum (Dwarf St. John’s-wort)

8/3/2012 · Bemis Rd Conservation Area, Pepperell, MA
≈ 6 × 4½" (15 × 11 cm) ID is uncertain

Hypericum mutilum description by Thomas H. Kent, last updated 3 Nov 2013.

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Hypericum mutilum (Dwarf St. John’s-wort)

7/19/2012 · Beaver Brook Association Conservation Lands, Rte. 130, Hollis, NH
≈ 6 × 4" (15 × 10 cm) ID is uncertain

Range:

About this map...