OF THE CAROLINAS & GEORGIA

Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales

WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/14/23):
Silphium asteriscus var. trifoliatum   FAMILY Asteraceae   Go to FSUS key



SYNONYMOUS WITH PLANTS NATIONAL DATABASE:
Silphium trifoliatum var. trifoliatum   FAMILY Asteraceae

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

Silphium asteriscus var. trifoliatum

SYNONYMOUS WITH Flora of North America

Silphium asteriscus var. trifoliatum

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

Silphium trifoliatum var. trifoliatum

SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 179-54-006:

Silphium trifoliatum   FAMILY Asteraceae

 

COMMON NAME:
Whorled Rosinweed


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

image of Silphium asteriscus var. trifoliatum, Whorled Rosinweed

Terry Holdsclaw    tdh_s_asteriscus_tri_3

June    Iredell County    NC

Stems 1.5-3m tall, terete, leafy to the summit. Leaves harshly scabrous, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).

image of Silphium asteriscus var. trifoliatum, Whorled Rosinweed

Terry Holdsclaw    tdh_s_asteriscus_tri_7446

June    Iredell County    NC

Cauline leaves predominately in whorls of 3. Leaf surfaces glabrous, per Weakley's Flora.

image of Silphium asteriscus var. trifoliatum, Whorled Rosinweed

Terry Holdsclaw    tdh_s_asteriscus_tri_1

July    Iredell County    NC

Ray florets 11-16 per head, per Flora of North America.

 

 

WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/14/23):
Silphium asteriscus var. trifoliatum   FAMILY Asteraceae

SYNONYMOUS WITH PLANTS NATIONAL DATABASE:
Silphium trifoliatum var. trifoliatum   FAMILY Asteraceae

SYNONYMOUS WITH Floristic Synthesis of North America. BONAP (Kartesz, 2021)
Silphium asteriscus var. trifoliatum

SYNONYMOUS WITH Flora of North America
Silphium asteriscus var. trifoliatum

SYNONYMOUS WITH Floristic Synthesis of North America (Kartesz, 1999)
Silphium trifoliatum var. trifoliatum

SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 179-54-006:
Silphium trifoliatum   FAMILY Asteraceae

 

Find by SCIENTIFIC NAME:

2910

Forb
Perennial

Habitat: woodlands, roadsides, river scours, per Weakley's Flora

Native to the Carolinas & Georgia

Uncommon (rare in Coastal Plain)

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

Click here to see a map showing all occurrences known to SERNEC, a consortium of southeastern herbaria. (Zoom in to see more detail.)

LEAVES:
Simple
Whorls of 3 (rarely opposite)

FLOWER:
Summer/Fall
Rays: Yellow
Disc: Yellow
Flower heads with 11-16 ray flowers, notched at apex
Inferior ovary
Disc flowers functionally staminate/ Ray flowers pistillate & fertile

FRUIT:
Summer/Fall
Achene

 

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



 


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