OF THE CAROLINAS & GEORGIA

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



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.

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm200525_5288

May    Greenville County    SC

Tall Pines Wildlife Management Area

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm200525_5289

May    Greenville County    SC

Tall Pines Wildlife Management Area

image of Silphium dentatum, Starry Rosinweed

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).

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm210603_0923

June    Greenville County    SC

Blackwell Heritage Preserve

Bracts ciliate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm210603_0926

June    Greenville County    SC

Blackwell Heritage Preserve

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm210610_1180

June    Greenville County    SC

Blackwell Heritage Preserve

image of Silphium dentatum, Starry Rosinweed

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).

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm220626_8694

June    Greenville County    SC

Tall Pines Wildlife Management Area

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm120727_913

July    Spartanburg County    SC

image of Silphium dentatum, Starry Rosinweed

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).

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm140711_837

July    Greenville County    SC

Swamp Rabbit Trail

Ray florets 8-13 per head, per Flora of North America.

image of Silphium dentatum, Starry Rosinweed

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).


click here to see other plants that look similar to this COMPARE involucral bracts of Silphium

image of Silphium dentatum, Starry Rosinweed

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).

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm140711_847

July    Greenville County    SC

Swamp Rabbit Trail

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm140718_942

July    Spartanburg County    SC

Basal leaves caducous; cauline leaves opposite or alternate, per Flora of North America.

image of Silphium dentatum, Starry Rosinweed

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.

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm140718_971

July    Spartanburg County    SC

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm140718_976

July    Spartanburg County    SC

Basal leaves caducous; cauline leaves opposite or alternate, per Flora of North America.

image of Silphium dentatum, Starry Rosinweed

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).

image of Silphium dentatum, Starry Rosinweed

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).

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm140720_019b

July    Spartanburg County    SC

Pales [receptacular bracts in the Asteraceae] stipitate-glandular, per Weakley's Flora.

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm140724_058b

July    Greenville County    SC

Swamp Rabbit Trail

Paleae puberulent and stipitate-glandular, per Flora of North America.

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm190704_9806

July    Greenville County    SC

Tall Pines Wildlife Management Area

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm190704_9809

July    Greenville County    SC

Tall Pines Wildlife Management Area

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm210806_2440

August    Spartanburg County    SC

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm210806_2442

August    Spartanburg County    SC

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm220927_0051

September    Greenville County    SC

Chestnut Ridge Heritage Preserve

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm220927_0052

September    Greenville County    SC

Chestnut Ridge Heritage Preserve

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm220927_0071

September    Greenville County    SC

Chestnut Ridge Heritage Preserve

image of Silphium dentatum, Starry Rosinweed

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

 

Find by SCIENTIFIC NAME:

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)

map
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!



 


Find by SCIENTIFIC NAME: