Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales
WEAKLEY'S FLORA OF THE SOUTHEASTERN US (4/24/22):
Centaurea stoebe ssp. micranthos
FAMILY
Asteraceae__
Go to FSUS key
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.
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Centaurea stoebe ssp. micranthos
FAMILY
Asteraceae__
SYNONYMOUS WITH Floristic Synthesis of North America. BONAP (Kartesz, 2021)
Centaurea stoebe ssp. australis
SYNONYMOUS WITH Floristic Synthesis of North America. BONAP (Kartesz, 2015)
Centaurea stoebe ssp. micranthos
SYNONYMOUS WITH Flora of North America north of Mexico, vol. 19-20-21 (2006)
Centaurea stoebe ssp. micranthos
SYNONYMOUS WITH Floristic Synthesis of North America (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
)
USDA / Selected Weeds of the US. 1970 swus_page_383
)
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 (Radford, Ahles, & Bell, 1968).
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 (Smith, 1998).
)
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 (Horn, Cathcart, Hemmerly, & Duhl, 2005).
)
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 (Horn, Cathcart, Hemmerly, & Duhl, 2005).
)
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 (Radford, Ahles, & Bell, 1968).
)
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 (Horn, Cathcart, Hemmerly, & Duhl, 2005).
)
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 (Kaufman & Kaufman, 2007).
)
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 (Radford, Ahles, & Bell, 1968).
)
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 OF THE SOUTHEASTERN US (4/24/22):
Centaurea stoebe ssp. micranthos
FAMILY
Asteraceae__
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Centaurea stoebe ssp. micranthos
FAMILY
Asteraceae__
SYNONYMOUS WITH
Floristic Synthesis of North America. BONAP (Kartesz, 2021)
Centaurea stoebe ssp. australis
SYNONYMOUS WITH
Floristic Synthesis of North America. BONAP (Kartesz, 2015)
Centaurea stoebe ssp. micranthos
SYNONYMOUS WITH
Flora of North America north of Mexico, vol. 19-20-21
Centaurea stoebe ssp. micranthos
SYNONYMOUS WITH
Floristic Synthesis of North America (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
Habitat: Roadsides, disturbed areas, per Weakley's Flora
Non-native: Europe
Common in NC, rare in GA & SC
CLICK HERE to see a map, notes, and images from Weakley's Flora of the Southeastern US.
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
Inferior ovary
Bisexual, fertile (peripheral florets sterile)
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 (Kaufman & Kaufman, 2007) p290
- A Field Guide for the Identification of Invasive Plants in Southern Forests (Miller, Chambliss, & Lowenstein, 2010) p112
- Newcomb's Wildflower Guide (Newcomb, 1977) p234
- Wildflowers of the Atlantic Southeast (Cotterman, Waitt, & Weakley, 2019) p392
- Wildflowers of the Eastern United States (Duncan & Duncan, 1999) p132
- Wildflowers in the Field and Forest: Northeastern US (Clemants & Gracie, 2006) p024
- Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005) p331
- Wildflowers of the Southern Mountains (Smith, 1998) p186
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