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
Dig deeper at SERNEC, a consortium of southeastern herbaria.
Read more about Silphium at Vascular Plants of North Carolina.
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.
)
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).
)
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.
)
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
2910
Forb
Perennial
Habitat: woodlands, roadsides, river scours, per Weakley's Flora
Native to the Carolinas & Georgia
Uncommon (rare in Coastal Plain)
CLICK HERE to see a map, notes, and images from Weakley's Flora of the Southeastern US.
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!
- All About South Carolina Wildflowers (Midgley, 1999) p259
- Wildflowers of Tennessee (Carman, 2005) p326
- Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005) p377
- Wildflowers of the Southern Mountains (Smith, 1998) p199
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