Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (2/8/20):
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 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.
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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 (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
2910
Forb
Perennial
Habitat: woodlands, roadsides, river scours, per Weakley's Flora
Native to the Carolinas & Georgia
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
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!
- 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