Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales
WEAKLEY'S FLORA (10/20/20):
Silphium dentatum
FAMILY
Asteraceae
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
INCLUDING
PLANTS National Database
Silphium asteriscus var. angustatum
SYNONYMOUS WITH
Flora of North America
Silphium asteriscus var. dentatum
INCLUDED WITHIN
Tennessee Flora Committee (2015)
Silphium asteriscus
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
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.
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JK Marlow jkm200525_5288
May Greenville County SC
)
JK Marlow jkm200525_5289
May Greenville County SC
)
JK Marlow jkm200525_5291
May Greenville County SC
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.
)
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
Disk flowers staminate. Style yellow, undivided, well exserted, per www.missouriplants.com.
)
JK Marlow jkm220626_8694
June Greenville County SC
)
JK Marlow jkm120727_913
July Spartanburg County SC
)
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.
)
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.
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.
)
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 are called chaff.
)
JK Marlow jkm140719_998b
July Spartanburg County SC
Chaff apices stipitate-glandular [bearing stalked glands], per Vascular Flora of the Carolinas.
)
JK Marlow jkm140720_019b
July Spartanburg County SC
Pales [receptacular bracts in the Asteraceae] stipitate-glandular, per Weakley's Flora.
)
JK Marlow jkm140724_058b
July Greenville County SC
Swamp Rabbit Trail
Paleae puberulent and stipitate-glandular, per Flora of North America.
)
JK Marlow jkm190704_9806
July Greenville County SC
)
JK Marlow jkm190704_9809
July Greenville County SC
)
JK Marlow jkm151006_320321
October Greenville County SC
Swamp Rabbit Trail
Some of these leaves are in whorls of three... (?)
WEAKLEY'S FLORA (10/20/20):
Silphium dentatum
FAMILY
Asteraceae
INCLUDING
PLANTS NATIONAL DATABASE:
Silphium asteriscus var. laevicaule
FAMILY
Asteraceae
INCLUDING
PLANTS National Database
Silphium asteriscus var. angustatum
SYNONYMOUS WITH
Flora of North America
Silphium asteriscus var. dentatum
INCLUDED WITHIN
Tennessee Flora Committee (2015)
Silphium asteriscus
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
INCLUDING
Manual of the Southeastern Flora (Small, 1933, 1938)
Silphium nodum
1386
Forb
Perennial
Native to the Carolinas & Georgia
Documented growing wild in GA NC SC
Common (uncommon in GA Mountains & Carolina Piedmont)
Look for it in woodlands, on roadsides, per Weakley's Flora
Click here to see a more detailed map from University of North Carolina at Chapel Hill Herbarium,
or click here to see a map from SERNEC, a consortium of southeastern herbaria.
...Variable
...Dry
LEAVES:
Simple
Opposite or alternate (basal leaves absent or withered at flowering)
FLOWER:
Spring/Summer/Fall
Rays: Yellow
Disc: Yellow
Disc flowers functionally staminate/ Ray flowers pistillate & fertile
Flower heads with 8-13 ray flowers, notched at apex
Inferior ovary
FRUIT:
Spring/Summer/Fall
Achene
TO LEARN MORE about this plant, look it up in a good book!
- All About South Carolina Wildflowers p258?
- Forest Plants of the Southeast and Their Wildlife Uses p172?
- Guide to the Wildflowers of SC p206
- Wildflowers of the Eastern United States p118
- Wildflowers of Tennessee p324?
- Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians p375?
- Wildflowers of the Southern Mountains p199