Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/14/23):
Silphium dentatum
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.
INCLUDING
PLANTS NATIONAL DATABASE:
Silphium asteriscus var. laevicaule
FAMILY
Asteraceae
SYNONYMOUS WITH Floristic Synthesis of North America. BONAP (Kartesz, 2021)
Silphium asteriscus var. dentatum
INCLUDED WITHIN Tennessee Flora Committee (2015)
Silphium asteriscus
SYNONYMOUS WITH Flora of North America north of Mexico, vol. 19-20-21 (2006)
Silphium asteriscus var. dentatum
INCLUDING Floristic Synthesis of North America (Kartesz, 1999)
Silphium asteriscus var. angustatum
INCLUDING Floristic Synthesis of North America (Kartesz, 1999)
Silphium asteriscus var. laevicaule
INCLUDING Vascular Flora of the Southeastern States (Cronquist 1980, Isely 1990)
Silphium dentatum
SYNONYMOUS WITH VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 179-54-004a:
Silphium dentatum var. dentatum FAMILY Asteraceae
INCLUDING Manual of the Southeastern Flora (Small, 1933, 1938)
Silphium elliottii
INCLUDING Manual of the Southeastern Flora (Small, 1933, 1938)
Silphium incisum
~ Manual of the Southeastern Flora (Small, 1933, 1938)
Silphium nodosum
INCLUDING Manual of the Southeastern Flora (Small, 1933, 1938)
Silphium nodum
COMMON NAME:
Starry Rosinweed
To see larger pictures, click or hover over the thumbnails.
)
JK Marlow jkm200525_5288
May Greenville County SC
Tall Pines Wildlife Management Area
)
JK Marlow jkm200525_5289
May Greenville County SC
Tall Pines Wildlife Management Area
)
JK Marlow jkm200525_5291
May Greenville County SC
Tall Pines Wildlife Management Area
This highly variable species is poorly understood, per Weakley's Flora (2020).
)
JK Marlow jkm210603_0923
June Greenville County SC
Blackwell Heritage Preserve
Bracts ciliate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
)
JK Marlow jkm210603_0926
June Greenville County SC
Blackwell Heritage Preserve
)
JK Marlow jkm210610_1180
June Greenville County SC
Blackwell Heritage Preserve
)
JK Marlow jkm220626_8693
June Greenville County SC
Tall Pines Wildlife Management Area
Disk flowers staminate. Style yellow, undivided, well exserted, per www.missouriplants.com (Tenaglia).
)
JK Marlow jkm220626_8694
June Greenville County SC
Tall Pines Wildlife Management Area
)
JK Marlow jkm250618_1117
June Greenville County SC
Poinsett Bridge Heritage Preserve
Paleae [pales/receptacular bracts in the Asteraceae/chaff] puberulent and stipitate-glandular, per Flora of North America.
)
JK Marlow jkm250618_1161
June Greenville County SC
Poinsett Bridge Heritage Preserve
)
JK Marlow jkm120728_987
July Abbeville County SC
Parson's Mountain Recreation Area
Stems glabrous or less often scabrous or spreading pubescent, leafy to summit, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
)
JK Marlow jkm140711_837
July Greenville County SC
Swamp Rabbit Trail
Ray florets 8-13 per head, per Flora of North America.
)
JK Marlow jkm140711_842
July Greenville County SC
Swamp Rabbit Trail
Involucral bracts of the genus Silphium are wide and usually squarrose, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
COMPARE
involucral bracts of Silphium
)
JK Marlow jkm140711_844
July Greenville County SC
Swamp Rabbit Trail
Leaves coarsely serrate to dentate, harshly scabrous, often hirsute, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
)
JK Marlow jkm140711_847
July Greenville County SC
Swamp Rabbit Trail
)
JK Marlow jkm140718_942
July Spartanburg County SC
Basal leaves caducous; cauline leaves opposite or alternate, per Flora of North America.
)
JK Marlow jkm140718_944
July Spartanburg County SC
Lvs petiolate or sessile/lanceolate, falcate or ovate/bases attenuate to round, per Flora of North America.
)
JK Marlow jkm140718_971
July Spartanburg County SC
)
JK Marlow jkm140718_976
July Spartanburg County SC
Basal leaves caducous; cauline leaves opposite or alternate, per Flora of North America.
)
JK Marlow jkm140719_998
July Spartanburg County SC
The bracts on the receptacle of the heads of Asteraceae can be called chaff, per Plant Identification Terminology (Harris & Harris, 1994).
)
JK Marlow jkm140719_998b
July Spartanburg County SC
Chaff apices stipitate-glandular [bearing stalked glands], per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
)
JK Marlow jkm140720_019b
July Spartanburg County SC
Pales [receptacular bracts in the Asteraceae] stipitate-glandular, per Weakley's Flora.
)
JK Marlow jkm190704_9806
July Greenville County SC
Tall Pines Wildlife Management Area
)
JK Marlow jkm190704_9809
July Greenville County SC
Tall Pines Wildlife Management Area
)
JK Marlow jkm210806_2440
August Spartanburg County SC
In cultivation
)
JK Marlow jkm210806_2442
August Spartanburg County SC
In cultivation
)
JK Marlow jkm220927_0051
September Greenville County SC
Chestnut Ridge Heritage Preserve
)
JK Marlow jkm220927_0052
September Greenville County SC
Chestnut Ridge Heritage Preserve
)
JK Marlow jkm220927_0071
September Greenville County SC
Chestnut Ridge Heritage Preserve
)
JK Marlow jkm151006_320321
October Greenville County SC
Swamp Rabbit Trail
Some of these leaves are in whorls of three...
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/14/23):
Silphium dentatum
FAMILY
Asteraceae
INCLUDING
PLANTS NATIONAL DATABASE:
Silphium asteriscus var. laevicaule
FAMILY
Asteraceae
SYNONYMOUS WITH
Floristic Synthesis of North America. BONAP (Kartesz, 2021)
Silphium asteriscus var. dentatum
INCLUDED WITHIN
Tennessee Flora Committee (2015)
Silphium asteriscus
SYNONYMOUS WITH
Flora of North America north of Mexico, vol. 19-20-21
Silphium asteriscus var. dentatum
INCLUDING
Floristic Synthesis of North America (Kartesz, 1999)
Silphium asteriscus var. angustatum
INCLUDING
Floristic Synthesis of North America (Kartesz, 1999)
Silphium asteriscus var. laevicaule
INCLUDING
Vascular Flora of the Southeastern States (Cronquist 1980, Isely 1990)
Silphium dentatum
SYNONYMOUS WITH
VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 179-54-004a:
Silphium dentatum var. dentatum
FAMILY
Asteraceae
INCLUDING
Manual of the Southeastern Flora (Small, 1933, 1938)
Silphium elliottii
INCLUDING
Manual of the Southeastern Flora (Small, 1933, 1938)
Silphium incisum
~
Manual of the Southeastern Flora (Small, 1933, 1938)
Silphium nodosum
INCLUDING
Manual of the Southeastern Flora (Small, 1933, 1938)
Silphium nodum
1386
Forb
Perennial
Habitat: woodlands, roadsides, per Weakley's Flora
Native to the Carolinas & Georgia
Common in GA Piedmont & GA Coastal Plain (rare in Carolina Mtns) (uncommon elsewhere in GA-NC-SC)
CLICK HERE to see a map, notes, and images from Weakley's Flora of the Southeastern US.
LEAVES:
Simple
Opposite or alternate (basal leaves absent or withered at flowering)
FLOWER:
Spring/Summer/Fall
Rays: Yellow
Disc: Yellow
Flower heads with 8-13 ray flowers, notched at apex
Inferior ovary
Disc flowers functionally staminate/ Ray flowers pistillate & fertile
FRUIT:
Spring/Summer/Fall
Achene
TO LEARN MORE about this plant, look it up in a good book!
- All About South Carolina Wildflowers (Midgley, 1999) p258?
- Forest Plants of the Southeast and Their Wildlife Uses (Miller & Miller, 2005) p172?
- Guide to the Wildflowers of SC, 1st ed. (Porcher & Rayner, 2001) p206
- Guide to the Wildflowers of SC, 2nd ed. (McMillan, Porcher, Rayner, & White; 2022) p263
- Wildflowers of the Eastern United States (Duncan & Duncan, 1999) p118
- Field Guide to the Wildflowers of Georgia (Chafin, 2016) p113
- Wildflowers of Tennessee (Carman, 2005) p324?
- Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005) p375?
- Wildflowers of the Southern Mountains (Smith, 1998) p199
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