Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales
WEAKLEY'S FLORA (11/30/12):
Centaurea stoebe ssp. micranthos
FAMILY
Asteraceae__
Dig deeper at SERNEC, a consortium of southeastern herbaria.
Check out EDDMapS.org to see where this has been reported.
Read more about Centaurea at Vascular Plants of North Carolina.
(?)
PLANTS NATIONAL DATABASE:
Centaurea stoebe ssp. micranthos
FAMILY
Asteraceae__
SYNONYMOUS WITH
Synthesis of the North American Flora (Kartesz, 1999)
Centaurea biebersteinii
SYNONYMOUS WITH (MISAPPLIED)
VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 179-24-003:
Centaurea maculosa
FAMILY
Asteraceae__
COMMON NAME:
Spotted Knapweed, Bushy Knapweed
To see larger pictures, click or hover over the thumbnails.
)
USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913 pnd_cema4_001_lvd
)
JK Marlow jkm140623_191b
June Greenville County SC
Swamp Rabbit Trail
Outer involucral bracts w pectinate (comb-like), scarious, blackish apices, per Vascular Flora of the Carolinas.
COMPARE
involucral bracts of Centaurea
)
JK Marlow jkm140623_199
June Greenville County SC
Swamp Rabbit Trail
)
JK Marlow jkm100702_004
July Greenville County SC
Swamp Rabbit Trail
Heads are discoid, but the large outer florets simulate ray flowers, per Wildflowers of the Southern Mountains.
)
JK Marlow jkm100702_007
July Greenville County SC
Swamp Rabbit Trail
)
JK Marlow jkm100702_008
July Greenville County SC
Swamp Rabbit Trail
Involucres urn-shaped, ~ 0.5" high, bracts tipped with a blackish fringe, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
)
JK Marlow jkm100702_009
July Greenville County SC
Swamp Rabbit Trail
Leaves pinnatifid with linear segments, downy-hairy, minutely roughened, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
)
JK Marlow jkm100702_011
July Greenville County SC
Swamp Rabbit Trail
Perennial 40-100cm tall, spreading-ascending, cespitose (tufted in clumps), per Vascular Flora of the Carolinas.
)
JK Marlow jkm100702_018
July Greenville County SC
Swamp Rabbit Trail
Central flowers narrow, bisexual; marginal flowers enlarged, sterile, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
)
JK Marlow jkm100702_050
July Greenville County SC
Swamp Rabbit Trail
)
JK Marlow jkm100702_052
July Greenville County SC
Swamp Rabbit Trail
)
JK Marlow jkm100702_064
July Greenville County SC
Swamp Rabbit Trail
The first year it has a basal rosette of deeply lobed leaves about 8" long, per Invasive Plants, Guide to Identification, Impacts and Control.
)
JK Marlow jkm130823_476
August Greenville County SC
Swamp Rabbit Trail
Stems floccose [bearing tufts of long soft tangled hairs], per Vascular Flora of the Carolinas.
)
JK Marlow jkm140831_142
August Greenville County SC
Swamp Rabbit Trail
)
Keith Bradley kab_c_stoebe_micran_78803
August Hamilton County NY
)
JK Marlow jkm121013_515516
October Greenville County SC
Swamp Rabbit Trail
)
Cindy Roche, Bugwood.org bug_1350048
Month Unknown
)
Ken Chamberlain, The Ohio State University, Bugwood.org bug_1553216
Month Unknown
)
John Cardina, The Ohio State University, Bugwood.org bug_1557011
Month Unknown
)
Montana Statewide Noxious Weed Awareness and Education Program Archive, Montana bug_2153083
Month Unknown
)
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org bug_5271008
Month Unknown
)
Joseph M. DiTomaso, University of California - Davis, Bugwood.org bug_5374337
Month Unknown
WEAKLEY'S FLORA (11/30/12):
Centaurea stoebe ssp. micranthos
FAMILY
Asteraceae__
(?)
PLANTS NATIONAL DATABASE:
Centaurea stoebe ssp. micranthos
FAMILY
Asteraceae__
SYNONYMOUS WITH
Synthesis of the North American Flora (Kartesz, 1999)
Centaurea biebersteinii
SYNONYMOUS WITH (MISAPPLIED)
VASCULAR FLORA OF THE CAROLINAS (Radford, Ahles, & Bell, 1968) 179-24-003:
Centaurea maculosa
FAMILY
Asteraceae__
299
Forb
Biennial/Short-lived perennial
Non-native: Europe
Documented growing wild in GA NC SC
Common (rare in GA & SC)
Look for it on roadsides, disturbed areas, 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.
This plant is causing problems in natural areas outside its native range, according to authorities such as:
- Kentucky Exotic Pest Plant Council, 2013
- SC Exotic Pest Plant Council, 2014
- Tennessee Exotic Pest Plant Council, 2009
- US Forest Service Southern Research Station
- Virginia Department of Conservation and Recreation, 2014
LEAVES:
Simple: pinnatifid
Basal rosette & alternate
FLOWER:
Summer/Fall
Disc: Pinkish-purple
Rays: Absent
Bisexual, fertile (peripheral florets sterile)
Inferior ovary
FRUIT:
Summer/Fall
Blackish-brown
Achene
TO LEARN MORE about this plant, look it up in a good book!
- Invasive Plants, Guide to Identification, Impacts and Control p290
- A Field Guide for the Identification of Invasive Plants in Southern Forests p112
- Newcomb's Wildflower Guide p234
- Southern Appalachian Wildflowers p131
- Wildflowers of the Atlantic Southeast p392
- Wildflowers of the Eastern United States p132
- Wildflowers in the Field and Forest p024
- Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians p331
- Wildflowers of the Southern Mountains p186