Native & Naturalized Plants of the Carolinas & Georgia


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

map
To see a detailed map, click here

 

partial shade ...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!



Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales

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)
Silphium elliottii

INCLUDING Manual of the Southeastern Flora (Small, 1933)
Silphium incisum

INCLUDING Manual of the Southeastern Flora (Small, 1933)
Silphium nodum

 

COMMON NAME:
Starry Rosinweed


Click or hover over the thumbnails to see larger pictures.

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm200525_5288

May    Greenville County    SC

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm200525_5289

May    Greenville County    SC

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm200525_5291

May    Greenville County    SC

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.

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    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.

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.


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.

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_964

July    Spartanburg County    SC

Disk flowers staminate. Style yellow, undivided, well exserted, per www.missouriplants.com.

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm140718_971

July    Spartanburg County    SC

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm140718_972

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 are called chaff.

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.

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

image of Silphium dentatum, Starry Rosinweed

JK Marlow    jkm190704_9809

July    Greenville County    SC

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... (?)