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Hypericum punctatum

Hypericum punctatum Lam.

Hypericum subpetiolatum E.P. Bicknell ex Small

Spotted 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
SpeciespunctatumSpotted, referring (at least in the case of P. punctatum) to the gland-dotted calyx

About plant names...

Spotted St. John’s-wort is a fairly uncommon North Amer­ican native plant. It is named for the presence of num­erous tiny black spots—glands—on new leaves. This species prefers black soil or gravel prairies, open wood­lands, savannas, river and lake banks, railroads, and roadsides.

Plants: 5-41" (13-105 cm) tall, with hairless red or green stems. Stems often branch from the base.

Leaves: Leaves are simple (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), but may be on ¹/₃₂" (1 mm) stems (petioles). Leaves turn brilliant reddish purple with age.

Flowers: Yellow, five-petaled flowers and densely clustered at stem tips, are ¼-½" (8-15 mm) around. The sepals, most easily seen enclosing the unopened buds, are also dotted with rows of black dots. At the center of each flower is a round central ovary, from which 3 styles extend, like an inverted tripod. The tip of each style is often red. Surrounding this are more than 13 stamens. Flowers lack a scent, and appear from May to September.

Fruits: Upright, ovoid or teardrop-shaped capsule ⅛-¼" (4-6.3 mm) long, reddish to deep purple. They split into three sections, releasing a lot of tiny seeds.

There are several varieties of St. John’s-wort, a few of which are shown below:

 

Hypericum punctatum (Spotted St. John’s-wort)

7/15/2019 · Beaver Brook Conservation Area, New Long Loop, Hollis, NH
≈ 5 × 4" (12 × 11 cm)

Hypericum punctatum (Spotted St. John’s-wort)

7/23/2017 · Pine Grove Furnace State Park, PA
≈ 3½ × 2½" (9.5 × 7 cm)

Hypericum punctatum (Spotted St. John’s-wort)

7/15/2019 · Beaver Brook Conservation Area, New Long Loop, Hollis, NH
≈ 3 × 2½" (8 × 6.7 cm)

 
Hypericum ellipticum

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

 

  You are here
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 punctatum on missouriplants.com

Hypericum punctatum on illinoiswildflowers.info

Hypericum punctatum at Minnesota Wildflowers

Hypericum punctatum on Wildflowers of the United States

Hypericum punctatum on eFloras

Hypericum punctatum (Spotted St. John’s-wort)

7/23/2017 · Pine Grove Furnace State Park, PA
≈ 5 × 3½" (13 × 9.2 cm)

Hypericum punctatum (Spotted St. John’s-wort)

7/15/2019 · Beaver Brook Conservation Area, New Long Loop, Hollis, NH
≈ 4 × 3½" (11 × 8.9 cm)

Hypericum punctatum (Spotted St. John’s-wort)

7/15/2019 · Beaver Brook Conservation Area, New Long Loop, Hollis, NH
≈ 4½ × 3" (11 × 8.1 cm)

Hypericum punctatum description by Thomas H. Kent, last updated 4 Aug 2019.

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Hypericum punctatum (Spotted St. John’s-wort)

7/15/2019 · Beaver Brook Conservation Area, New Long Loop, Hollis, NH
≈ 5 × 4" (13 × 11 cm)

Hypericum punctatum (Spotted St. John’s-wort)

7/23/2017 · Pine Grove Furnace State Park, PA
≈ 4 × 6" (11 × 16 cm)

Range:

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