FloraFinder.org
Home   About Us   Want to Help?   FAQ  
Searching   Image Use Biblio

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
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, Hollis, NH
≈ 8 × 5" (19 × 13 cm) ID is uncertain

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

8/13/2017 · Burges Pond, Westford, MA
≈ 7 × 4½" (18 × 12 cm)

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 ellipticum
You are here
Hypericum mutilum

Hypericum perforatum
Common Name

Pale St. John’s-wort

Dwarf St. John’s-wort

St. John’s Wort
Plant 8-20" (20-50 cm) tall. Stems are hairless, somewhat 4-angled.< 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 Yellow, in clusters of 1 to a few at stem and branch tips. Each flower is ⅜-½" (1-1.4 cm) around, with 5 yellow petals and 5 pale green sepals, a fountain of yellow stamens, and three styles fused into one in the center. (Rarely, the number of sepals and petals may be 4 or 6.) There are in excess of 100 stamens. Flowers appear from July to August. 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 ⅜-1½" (1-4 cm) × ⅛-¾" (3-20 mm), and elliptical-oblong in shape, generally rounded at leaf tips, and attached directly to the stem (sessile). 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 Capsules are ⅛-³/₁₆" (4-6 mm) × ⅛-³/₁₆" (3.5-5 mm), ellipsoid, and rounded to a tip. 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 Wild
Occurrence     Common, sometimes invasive

 

 
Hypericum punctatum
Common Name

Spotted St. John’s-wort
Plant 5-41" (13-105 cm) tall, with hairless red or green stems.
Flowers Yellow, 5-petaled flowers, densely clustered at stem tips, are ¼-½" (8-15 mm) around. Sepals are also dotted with rows of black dots. At the center of each flower is a round central ovary, from which 3 styles extend. The tip of each style is often red. Surrounding this are more than 13 stamens. Flowers appear from May to Sep.
Leaves Leaves are unlobed, hairless, opposite, oblong to oval elliptic, ¾-2" (1.9-5.7 cm) long × ¼-½" (8.3-12 mm) wide. New leaves are spotted with tiny black glands. They are typically widest somewhat past the midpoint. Leaves are usually attached to the stem (sessile).
Fruit Upright, ovoid or teardrop-shaped capsule ⅛-¼" (4-6.3 mm) long, reddish to deep purple.
Range/ Zones

Type Wild

 

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)

8/13/2017 · Burges Pond, Westford, MA
≈ 4 × 4" (11 × 10 cm)

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

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

Hypericum mutilum description by Thomas H. Kent, last updated 29 Aug 2019.

© FloraFinder.org. All rights reserved.


 

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

8/13/2017 · Burges Pond, Westford, MA
≈ 6 × 4" (16 × 11 cm)

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 (Dwarf St. John’s-wort)

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

Range:

About this map...