Difference between revisions of "Centaurea macrocephala"
Sp. Pl., ed. 4 [Willdenow] 3(3): 2298 (-2299). 1803 [Apr-Dec 1803].
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|elevation=400–2000 m | |elevation=400–2000 m | ||
|distribution=Ont.;Que.;Colo.;Mich.;Wash.;Wis.;e Europe;w Asia. | |distribution=Ont.;Que.;Colo.;Mich.;Wash.;Wis.;e Europe;w Asia. | ||
| − | |discussion=<p>Although Centaurea macrocephala is cultivated as an ornamental and for cut flowers in many areas, it has been declared a noxious weed by the state of Washington because of its potential status as an invader.</p> | + | |discussion=<p>Although <i>Centaurea macrocephala</i> is cultivated as an ornamental and for cut flowers in many areas, it has been declared a noxious weed by the state of Washington because of its potential status as an invader.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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|publication year= | |publication year= | ||
|special status= | |special status= | ||
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V19-20-21/V19_209.xml |
|tribe=Asteraceae tribe Cardueae | |tribe=Asteraceae tribe Cardueae | ||
|genus=Centaurea | |genus=Centaurea | ||
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| − | --> | + | -->[[Category:Treatment]][[Category:Centaurea]] |
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Revision as of 16:09, 18 September 2019
Perennials, 50–170 cm. Stems usually several, erect, unbranched or sparingly branched distally, villous with septate hairs, thinly arachnoid-tomentose, fistulose proximal to heads. Leaves short-villous and thinly arachnoid, ± glabrate, resin-gland-dotted; basal and proximal cauline petiolate, blades oblanceolate to narrowly ovate, 10–30 cm, margins entire or shallowly dentate; cauline sessile, shortly decurrent, not much smaller except those crowded proximal to heads, blades lanceolate to ovate, 5–10 cm, entire, often ± undulate, apices acute. Heads disciform or weakly radiant, borne singly, sessile, closely subtended by clusters of reduced leaves. Involucres ovoid to hemispheric, 25–35 mm. Phyllaries: bodies pale green or stramineous, ovate or broadly lanceolate, glabrous, appendages erect to spreading, brown, scarious, abruptly expanded, 1–2 cm wide, ± covering phyllary bodies, lacerate fringed, sometimes tipped by weak spines 1–2 mm, glabrous. Florets many; corollas yellow; corollas of sterile florets slightly expanded, ca. 4 mm; corollas of disc florets ca. 3.5 mm. Cypselae 7–8 mm; pappi of many setiform scales (“flattened bristles”), 5–8 mm. 2n = 18 (Russia).
Phenology: Flowering summer (Jun–Sep).
Habitat: Garden escape in meadows, grassy clearings
Elevation: 400–2000 m
Distribution
Ont., Que., Colo., Mich., Wash., Wis., e Europe, w Asia.
Discussion
Although Centaurea macrocephala is cultivated as an ornamental and for cut flowers in many areas, it has been declared a noxious weed by the state of Washington because of its potential status as an invader.
Selected References
None.