Centaurea diluta

Aiton

Hort. Kew. 3: 261. 1789.

Common names: North African knapweed
Introduced
Treatment appears in FNA Volume 19. Treatment on page 192. Mentioned on page 182, 183, 184, 193.

Annuals or perennials, to 200 cm. Stems simple proximally, openly branched distally, glabrous or thinly hairy. Leaves thinly pubescent, basal and proximal cauline petiolate, blades 10–15 cm, margins coarsely pinnately lobed; mid cauline sessile or short-petiolate, short-decurrent, blades obovate or narrowly oblong, 2–8 cm, entire to pinnately lobed; distal cauline oblong, entire to irregularly lobed. Heads radiant, in open cymiform arrays, pedunculate. Involucres ovoid, 8–15 mm diam. Principal phyllaries: bodies greenish, ovate, scarious-margined, appendages stramineous to brown, scarious, fringed with slender teeth, tipped by slender spines 1–5 mm. Innermost phyllaries unarmed with brown, expanded, lacerate appendages. Florets many; corollas pink-purple, those of sterile florets 25–30 mm, enlarged, raylike, those of fertile florets ± 20 mm. Cypselae tan, 3–3.5 mm; pappi many, white, unequal bristles 3–5 mm. 2n = 20.


Phenology: Flowering spring (Apr–Jun).
Habitat: Escaped from cultivation in disturbed sites
Elevation: 0–100 m

Distribution

V19-224-distribution-map.gif

Introduced; Calif., Mo., N.Y., sw Europe, n Africa

Discussion

Selected References

None.

Lower Taxa

None.

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

... more about "Centaurea diluta"
with fine , 1-celled hairs +  and glabrous +
scarious +
brown +  and stramineous +
erect;spreading +
lacerate +  and fringed +
cymiform +  and open +
indeterminate +  and determinate +
David J. Keil +  and Jörg Ochsmann +
decurrent +
Asteraceae tribe Cynareae +
compound +  and simple +
entire;irregularly lobed +
2 cm20 mm <br />0.02 m <br /> (8 cm80 mm <br />0.08 m <br />) +
scarious-margined +
10-nerved or 20-nerved +  and rugose +
barbed +  and smooth +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
North African knapweed +
actinomorphic +
radial +  and bilateral +
white +  and blue pink purple or yellow +
inconspicuous +
expanded +  and slender +
compressed +  and barrel--shaped +
fertile +  and bisexual +
Calif. +, Mo. +, N.Y. +, sw Europe +  and n Africa +
0–100 m +
glandular-punctate +
puberulent +, strigose +, villous +, tomentose +  and glabrous +
pistillate +, staminate +  and neuter +
20 cm200 mm <br />0.2 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
fertile +  and sterile +
winged +  and beaked +
dispersed +
Escaped from cultivation in disturbed sites +
pedunculate +
disciform +  and discoid +
indeterminate +
each +  and sessile +
0.8 cm8 mm <br />0.008 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
acute +  and linear-oblong +
entire +  and dentate +
2-carpellate +
persistent +
Flowering spring (Apr–Jun). +
papillate +  and smooth +
distinct +  and fused +
flat;convex +
exalbuminous +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Introduced +
branched +  and simple +
spreading +, ascending +  and erect +
appendaged +  and truncate +
dilated +  and swollen +
enlarged +
Acosta +, Cnicus +, Grossheimia +, Jacea +  and Leucacantha +
Centaurea diluta +
Centaurea +
species +
short-decurrent +, short-petiolate +  and sessile +
perennial +  and annual +
tomentose +  and glabrous +
0 cm0 mm <br />0 m <br /> (200 cm2,000 mm <br />2 m <br />) +
tree +, vine +, shrub +  and subshrub +
15 +, 13 +, 12 +, 11 +, 10 +, 9 +  and 8 +