OF THE CAROLINAS & GEORGIA

Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Rosids: Fabids: Malpighiales

WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Triadenum walteri   FAMILY Hypericaceae   Go to FSUS key



SYNONYMOUS WITH PLANTS NATIONAL DATABASE:
Triadenum walteri   FAMILY Clusiaceae

SYNONYMOUS WITH Floristic Synthesis of North America. BONAP (Kartesz, 2021)

Hypericum walteri

SYNONYMOUS WITH Flora of North America

Triadenum walteri

SYNONYMOUS WITH Floristic Synthesis of North America (Kartesz, 1999)

Triadenum walteri

SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 126-01-007:

Hypericum walteri   FAMILY Hypericaceae

SYNONYMOUS WITH Britton & Brown Illus Flora of Northeast US & adjacent Canada (Gleason, 1952)

Triadenum walteri

SYNONYMOUS WITH Gray's Manual of Botany (Fernald, 1950)

Hypericum tubulosum var. walteri

SYNONYMOUS WITH Manual of the Southeastern Flora (Small, 1933, 1938)

Triadenum petiolatum

 

COMMON NAME:
Walter’s Marsh St. Johnswort, Greater Marsh St. Johnswort


         To see larger pictures, click or hover over the thumbnails.

image of Triadenum walteri, Walter’s Marsh St. Johnswort, Greater Marsh St. Johnswort

USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913    pnd_trpe12_001_lvd

        

image of Triadenum walteri, Walter’s Marsh St. Johnswort, Greater Marsh St. Johnswort

JK Marlow    jkm170320_160

March    Greenville County    SC

Cedar Falls Park

image of Triadenum walteri, Walter’s Marsh St. Johnswort, Greater Marsh St. Johnswort

JK Marlow    jkm210813_2751

August    Greenville County    SC

Blackwell Heritage Preserve

image of Triadenum walteri, Walter’s Marsh St. Johnswort, Greater Marsh St. Johnswort

JK Marlow    jkm210813_2754

August    Greenville County    SC

Blackwell Heritage Preserve

The lower surface of the leaves of my specimens are very glaucous, per Flora of Indiana (Deam, 1940).

image of Triadenum walteri, Walter’s Marsh St. Johnswort, Greater Marsh St. Johnswort

JK Marlow    jkm210813_2756

August    Greenville County    SC

Blackwell Heritage Preserve

Grows to an average of 2 feet tall and is typically is found in colonies, per Vascular Plants of North Carolina.

image of Triadenum walteri, Walter’s Marsh St. Johnswort, Greater Marsh St. Johnswort

JK Marlow    jkm230809_4939

August    Greenville County    SC

Core Bunched Arrowhead Heritage Preserve

Lvs mostly elliptic, to ~ 2-2.5" long, tip rounded, base rounded to tapered, petiole distinct, per Vascular Plants of North Carolina.

image of Triadenum walteri, Walter’s Marsh St. Johnswort, Greater Marsh St. Johnswort

JK Marlow    jkm230809_4952

August    Greenville County    SC

Core Bunched Arrowhead Heritage Preserve

image of Triadenum walteri, Walter’s Marsh St. Johnswort, Greater Marsh St. Johnswort

JK Marlow    jkm161013_936

October    Greenville County    SC

Cedar Falls Park

image of Triadenum walteri, Walter’s Marsh St. Johnswort, Greater Marsh St. Johnswort

JK Marlow    jkm161013_936b

October    Greenville County    SC

Cedar Falls Park

Leaves narrowed to cuneate or broadly cuneate... base. Lower leaves petiolate, per Weakley's Flora.

image of Triadenum walteri, Walter’s Marsh St. Johnswort, Greater Marsh St. Johnswort

JK Marlow    jkm161013_936c

October    Greenville County    SC

Cedar Falls Park

Petals pale pink; stamens in 3 fascicles of 3 stamen each; perianth 5-merous, per Weakley's Flora (2020).

 

 

WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Triadenum walteri   FAMILY Hypericaceae

SYNONYMOUS WITH PLANTS NATIONAL DATABASE:
Triadenum walteri   FAMILY Clusiaceae

SYNONYMOUS WITH Floristic Synthesis of North America. BONAP (Kartesz, 2021)
Hypericum walteri

SYNONYMOUS WITH Flora of North America
Triadenum walteri

SYNONYMOUS WITH Floristic Synthesis of North America (Kartesz, 1999)
Triadenum walteri

SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 126-01-007:
Hypericum walteri   FAMILY Hypericaceae

SYNONYMOUS WITH Britton & Brown Illus Flora of Northeast US & adjacent Canada (Gleason, 1952)
Triadenum walteri

SYNONYMOUS WITH Gray's Manual of Botany (Fernald, 1950)
Hypericum tubulosum var. walteri

SYNONYMOUS WITH Manual of the Southeastern Flora (Small, 1933, 1938)
Triadenum petiolatum

 

Find by SCIENTIFIC NAME:

2227

Forb
Perennial

Habitat: swamp forests and marshes, per Weakley's Flora

Native to the Carolinas & Georgia

Common in Coastal Plain, uncommon in Piedmont, rare in Mountains

map
CLICK HERE to see a map, notes, and images from Weakley's Flora of the Southeastern US.

LEAVES:
Simple
Opposite
Lower leaves have petioles

FLOWER:
Summer/Fall
Pinkish
Radially symmetrical
5-merous
5 persistent sepals
5 petals
9 stamens, persistent, in 3 clusters of 3
Superior ovary
Bisexual

FRUIT:
Summer/Fall
Capsule

 

TO LEARN MORE about this plant, look it up in a good book!



 


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