OF THE CAROLINAS & GEORGIA

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

WEAKLEY'S FLORA (2/8/20):
Silphium asteriscus var. trifoliatum   FAMILY Asteraceae   NEW! Click to go to FSUS key


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

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.

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 (2/8/20):
Silphium asteriscus var. trifoliatum   FAMILY Asteraceae

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

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

Native to the Carolinas & Georgia

Common in NC-SC Mountains & NC Piedmont, rare in NC Coastal Plain, uncommon elsewhere in GA-NC-SC

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

map
NEW! Click here to see a map from Weakley's Flora of the Southeastern US showing range and abundance.

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
Disc flowers functionally staminate/ Ray flowers pistillate & fertile
Flower heads with 11-16 ray flowers, notched at apex
Inferior ovary

FRUIT:
Summer/Fall
Achene

 

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



 


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