Centaurea melitensis

Linnaeus

Sp. Pl. 2: 917. 1753.

Common names: Tocalote Maltese star thistle or centaury Napa thistle croix de Malte
Introduced
Treatment appears in FNA Volume 19. Treatment on page 193. Mentioned on page 183.

Annuals, 10–100 cm, herbage loosely gray-tomentose and villous with jointed multicellular hairs, sometimes minutely scabrous, minutely resin-gland-dotted. Stems 1–few, few–many branched distally. Leaves: basal and proximal cauline petiolate or tapering to base, usually absent at anthesis, blades oblong to oblanceolate, 2–15 cm, margins entire to dentate or pinnately lobed; cauline long-decurrent, blades linear to oblong or oblanceolate, 1–5 cm, entire or dentate. Heads disciform, 1–few at branch tips, borne singly or in open leafy corymbiform arrays, sometimes clustered in distal axils, sessile or pedunculate. Involucres ovoid, 10–15 mm, loosely cobwebby-tomentose or becoming glabrous. Principal phyllaries: bodies ± stramineous, ovate, appendages purplish, spiny-fringed at base, each tipped by slender spine 5–10 mm. Inner phyllaries: appendages entire, acute or spine-tipped. Florets many; corollas yellow, those of sterile florets 10–12 mm, slender, inconspicuous, those of fertile florets 10–12 mm. Cypselae dull white or light-brown, ca. 2.5 mm, finely hairy; pappi of many white, unequal, stiff bristles 2.5–3 mm. 2n = 24.


Phenology: Flowering mostly spring–summer (Apr–Jul).
Habitat: Roadsides, fields, pine-oak woodlands, chaparral, agricultural areas
Elevation: 0–1500 m

Distribution

V19-225-distribution-map.gif

Introduced; Widely, B.C., Ala., Ariz., Calif., Ga., Idaho, Ill., Mass., Miss., Mo., Nev., N.J., N.Mex., Oreg., Pa., Tex., Utah, Wash., Wis., Mexico (Baja California), Europe, Asia, Africa

Discussion

Centaurea melitensis is native to the Mediterranean region. It is listed as a noxious weed in New Mexico.

Selected References

None.

Lower Taxa

None.

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

... more about "Centaurea melitensis"
with fine , 1-celled hairs +  and glabrous +
scarious +
tipped +  and spiny-fringed +
erect;spreading +
spine-tipped +, acute +  and entire +
corymbiform +, leafy +  and open +
indeterminate +  and determinate +
David J. Keil +  and Jörg Ochsmann +
Linnaeus +
decurrent +
Asteraceae tribe Cynareae +
compound +  and simple +
linear;oblong or oblanceolate +
1 cm10 mm <br />0.01 m <br /> (5 cm50 mm <br />0.05 m <br />) +
stramineous +
10-nerved or 20-nerved +  and rugose +
barbed +  and smooth +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
long-decurrent +
Tocalote +, Maltese star thistle or centaury +, Napa thistle +  and croix de Malte +
actinomorphic +
radial +  and bilateral +
white +  and blue pink purple or yellow +
inconspicuous +
expanded +  and slender +
light-brown +, white +  and dull +
compressed +  and barrel--shaped +
fertile +  and bisexual +
Widely +, B.C. +, Ala. +, Ariz. +, Calif. +, Ga. +, Idaho +, Ill. +, Mass. +, Miss. +, Mo. +, Nev. +, N.J. +, N.Mex. +, Oreg. +, Pa. +, Tex. +, Utah +, Wash. +, Wis. +, Mexico (Baja California) +, Europe +, Asia +  and Africa +
0–1500 m +
glandular-punctate +
puberulent +, strigose +, villous +, tomentose +  and glabrous +
pistillate +, staminate +  and neuter +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
fertile +  and sterile +
winged +  and beaked +
dispersed +
Roadsides, fields, pine-oak woodlands, chaparral, agricultural areas +
multicellular +  and jointed +
pedunculate +  and sessile +
in open leafy corymbiform arrays +  and singly +
indeterminate +
resin-gland-dotted +, villous +  and gray-tomentose +
each +  and sessile +
glabrous +  and cobwebby-tomentose +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
acute +  and linear-oblong +
lobed +  and dentate +
2-carpellate +
persistent +
Flowering mostly spring–summer (Apr–Jul). +
papillate +  and smooth +
distinct +  and fused +
flat;convex +
exalbuminous +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Introduced +
spreading +, ascending +  and erect +
few +  and many +
appendaged +  and truncate +
dilated +  and swollen +
enlarged +
Acosta +, Cnicus +, Grossheimia +, Jacea +  and Leucacantha +
Centaurea melitensis +
Centaurea +
species +
tomentose +  and glabrous +
10 cm100 mm <br />0.1 m <br /> (100 cm1,000 mm <br />1 m <br />) +
tree +, vine +, shrub +  and subshrub +
15 +, 13 +, 12 +, 11 +, 10 +, 9 +  and 8 +