Centaurea macrocephala

Muss. Puschk. ex Willd.

Sp. Pl., ed. 4 [Willdenow] 3(3): 2298 (-2299). 1803 [Apr-Dec 1803].

Common names: Globe centaurea big-head knapweed yellow bachelor’s button or cornflower centaurée à gros capitules
Introduced
Synonyms: Grossheimia macrocephala (Puschkarew ex Willdenow) Sosnowsky & Takhtajan
Treatment appears in FNA Volume 19. Treatment on page 185. Mentioned on page 183.
Revision as of 14:27, 15 December 2020 by RevisionBot (talk | contribs) (Bot: Adding category Revised Since Print)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

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

V19-209-distribution-map.gif

Introduced; 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.

Lower Taxa

None.

"glabrous" is not a number."fine" is not a number."fine" is not a number.

... more about "Centaurea macrocephala"
with fine , 1-celled hairs +  and glabrous +
scarious +
erect;spreading +
fringed +  and lacerate +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
indeterminate +  and determinate +
David J. Keil +  and Jörg Ochsmann +
Muss. Puschk. ex Willd. +
decurrent +
Asteraceae tribe Cynareae +
compound +  and simple +
undulate;lanceolate;ovate +
5 cm50 mm <br />0.05 m <br /> (10 cm100 mm <br />0.1 m <br />) +
stramineous +  and pale green +
10-nerved or 20-nerved +  and rugose +
lanceolate;ovate +
barbed +  and smooth +
Globe centaurea +, big-head knapweed +, yellow bachelor’s button or cornflower +  and centaurée à gros capitules +
actinomorphic +
radial +  and bilateral +
inconspicuous +
expanded +  and slender +
compressed +  and barrel--shaped +
fertile +  and bisexual +
Ont. +, Que. +, Colo. +, Mich. +, Wash. +, Wis. +, e Europe +  and w Asia +
400–2000 m +
glandular-punctate +
puberulent +, strigose +, villous +, tomentose +  and glabrous +
pistillate +, staminate +  and neuter +
4 cm40 mm <br />0.04 m <br /> (?) +
winged +  and beaked +
dispersed +
Garden escape in meadows, grassy clearings +
singly +  and radiant +
indeterminate +
each +  and sessile +
ovoid;hemispheric +
2.5 cm25 mm <br />0.025 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
resin-gland-dotted +, glabrate +, arachnoid +  and short-villous +
reduced +
acute +  and linear-oblong +
dentate +  and entire +
usually lobed +  and dissected +
2-carpellate +
persistent +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
Flowering summer (Jun–Sep). +
papillate +  and smooth +
distinct +  and fused +
Sp. Pl., ed. 4 [Willdenow] +
1753 +  and 1754 +
flat;convex +
setiform +
exalbuminous +
Introduced +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
branched +  and unbranched +
arachnoid-tomentose +  and villous +
fistulose +
appendaged +  and truncate +
dilated +  and swollen +
enlarged +
Grossheimia macrocephala +
Centaurea macrocephala +
Centaurea +
species +
tomentose +  and glabrous +
50 cm500 mm <br />0.5 m <br /> (170 cm1,700 mm <br />1.7 m <br />) +
tree +, vine +, shrub +  and subshrub +
15 +, 13 +, 12 +, 11 +, 10 +, 9 +  and 8 +