Centaurea phrygia

Linnaeus

Sp. Pl. 2: 910. 1753.

Common names: Wig knapweed
Introduced
Synonyms: Centaurea austriaca Willdenow
Treatment appears in FNA Volume 19. Treatment on page 188. Mentioned on page 182, 183, 189.

Perennials, 15–80 cm. Stems few–many, erect, simple or branched. Leaves ± arachnoid-tomentose; basal and proximal cauline winged-petiolate, blades lanceolate to ovate, 3–15 cm, margins entire or dentate; distal cauline sessile, sometimes clasping, not decurrent, well developed. Heads usually radiant, usually borne singly. Involucres ovoid to ± spheric, 15–20 mm. Principal phyllaries: bodies lanceolate to ovate, loosely tomentose or glabrous, appendages brown or blackish, lanceolate to ovate, ± covering bodies of adjacent phyllaries, tips often recurved, elongate, featherlike, pectinately dissected into long, filiform lobes. Inner phyllaries: tips erect, ovate or orbiculate, irregularly dentate or lobed. Florets many, the peripheral sterile; corollas pink or purple, those of sterile much expanded and exceeding corollas of fertile florets, those of fertile 20–25 mm. Cypselae tan, 3–4 mm, finely hairy; pappi 0 or of many unequal bristles 0.5–2 mm. 2n = 22 (Russia), 44 (Slovenia).


Phenology: Flowering summer (Jul–Sep).
Habitat: Disturbed sites
Elevation: 100–300 m

Distribution

V19-215-distribution-map.gif

Introduced; Fla., Ill., Mo., N.J., N.Y., Ohio, Pa., Vt., Va., W.Va., Europe

Discussion

According to R. J. Moore (1972), reports of Centaurea nervosa Willdenow [C. uniflora Turra subsp. nervosa (Willdenow) Bonnier & Layens] from New York were based on a specimen referable to C. phrygia subsp. phrygia. Moore called these plants C. austriaca Willdenow, which J. Dostál (1976) treated as a synonym of C. phrygia subsp. phrygia.

Specimens of Centaurea phrygia are sometimes misidentified as C. nigrescens (or one or another of its synonyms) or as C. nigra. The elongate, often recurved, setose-ciliate tips of the phyllary appendages are a readily recognizable characteristic of this species. Considerable morphologic variation occurs in vegetative features and head dimensions in American material of the species, and it is possible that one or more of the specimens we have identified as C. phrygia represent an extreme variant of one of the members of the C. jacea complex. J. Dostál (1976) recognized 10 subspecies of C. phrygia in Europe. We have chosen not to assign the sparse North American material to subspecies.

Selected References

None.

Lower Taxa

None.

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

... more about "Centaurea phrygia"
with fine , 1-celled hairs +  and glabrous +
scarious +
blackish +  and brown +
erect;spreading +
lanceolate +  and ovate +
indeterminate +  and determinate +
David J. Keil +  and Jörg Ochsmann +
Linnaeus +
decurrent +
Asteraceae tribe Cynareae +
compound +  and simple +
lanceolate;ovate +
3 cm30 mm <br />0.03 m <br /> (15 cm150 mm <br />0.15 m <br />) +
glabrous +  and tomentose +
10-nerved or 20-nerved +  and rugose +
lanceolate;ovate +
barbed +  and smooth +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Wig knapweed +
actinomorphic +
radial +  and bilateral +
white +  and blue pink purple or yellow +
purple +  and pink +
2 cm20 mm <br />0.02 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
inconspicuous +
expanded +
compressed +  and barrel--shaped +
fertile +  and bisexual +
Fla. +, Ill. +, Mo. +, N.J. +, N.Y. +, Ohio +, Pa. +, Vt. +, Va. +, W.Va. +  and Europe +
100–300 m +
glandular-punctate +
puberulent +, strigose +, villous +, tomentose +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Disturbed sites +
disciform +  and discoid +
singly +  and radiant +
indeterminate +
each +  and sessile +
ovoid;more or less spheric +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
arachnoid-tomentose +
filiform +
dentate +  and entire +
usually lobed +  and dissected +
2-carpellate +
persistent +
of many unequal bristles +
Flowering summer (Jul–Sep). +
papillate +  and smooth +
distinct +  and fused +
flat;convex +
exalbuminous +
Introduced +
branched +  and simple +
few +  and many +
appendaged +  and truncate +
dilated +  and swollen +
enlarged +
Centaurea austriaca +
Centaurea phrygia +
Centaurea +
species +
erect +  and recurved +
lobed +, dentate +, orbiculate +, ovate +, dissected +, featherlike +  and elongate +
tomentose +  and glabrous +
15 cm150 mm <br />0.15 m <br /> (80 cm800 mm <br />0.8 m <br />) +
tree +, vine +, shrub +  and subshrub +
15 +, 13 +, 12 +, 11 +, 10 +, 9 +  and 8 +