Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Silphium pinnatifidum
FAMILY
Asteraceae
Go to FSUS key
Dig deeper at SERNEC, a consortium of southeastern herbaria.
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Silphium pinnatifidum
FAMILY
Asteraceae
SYNONYMOUS WITH Flora of North America north of Mexico, vol. 19-20-21 (2006)
Silphium terebinthinaceum var. pinnatifidum
INCLUDED WITHIN Britton & Brown Illus Flora of Northeast US & adjacent Canada (Gleason, 1952)
Silphium terebinthinaceum
SYNONYMOUS WITH Manual of the Southeastern Flora (Small, 1933, 1938)
Silphium pinnatifidum
COMMON NAME:
Tansy Rosinweed, Cutleaf Prairie-dock
To see larger pictures, click or hover over the thumbnails.
)
Richard and Teresa Ware rtw_silphium_pinnatifidum
August
Basal leaves elliptic, half as wide as long, pinnatifid, long-stalked, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
)
Stephanie C. Brundage scb_081521hayesville05
August Clay County NC
)
Stephanie C. Brundage scb_081521hayesville06
August Clay County NC
)
Stephanie C. Brundage scb_081521hayesville07
August Clay County NC
)
Richard and Teresa Ware rtw_s_pinnatifidum_2
September
Rays 13-21, about 1" long; disk 0.6-1.4" wide; both yellow, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Silphium pinnatifidum
FAMILY
Asteraceae
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Silphium pinnatifidum
FAMILY
Asteraceae
SYNONYMOUS WITH
Flora of North America north of Mexico, vol. 19-20-21
Silphium terebinthinaceum var. pinnatifidum
INCLUDED WITHIN
Britton & Brown Illus Flora of Northeast US & adjacent Canada (Gleason, 1952)
Silphium terebinthinaceum
SYNONYMOUS WITH
Manual of the Southeastern Flora (Small, 1933, 1938)
Silphium pinnatifidum
3788
Forb
Perennial
Habitat: limestone glades and woodlands, blackland prairies, per Weakley's Flora
Native to Georgia
Rare
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
Alternate & basal
FLOWER:
Summer/Fall
Rays: Yellow
Disc: Yellow
Flower heads with 17-29 ray flowers, notched at apex
Inferior ovary
Disc flowers functionally staminate/ Ray flowers pistillate & fertile
FRUIT:
Summer/Fall
Achene
TO LEARN MORE about this plant, look it up in a good book!
- Wildflowers of Tennessee (Carman, 2005) p325
- Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005) p377
If a search such as "Carex leptalea var. leptalea" doesn't deliver the results you want, try "Carex leptalea".
Or, to minimize chances of a misspelling, try just "Carex le".
Less is more: If "pencil flower" doesn't deliver the results you want, try "pencil".