Cynara cardunculus subsp. flavescens

Wiklund

Bot. J. Linn. Soc. 109: 120, fig. 15A–D, F–J. 1992

Treatment appears in FNA Volume 19. Treatment on page 90. Mentioned on page 89.
Click plate for higher resolution version.
Illustrator: John Myers
Leaves armed with spines 1–3 cm. Middle phyllaries acute to short-acuminate at apex with point 10–21 mm and spine tip 2–5(–6) mm, distal margins with prominent yellowish margins 0.5–1+ mm.

Phenology: Flowering spring–summer (Apr–Jul).
Habitat: Disturbed areas in grasslands, coastal scrub, chaparral, riparian habitats, fallow fields, roadsides
Elevation: 0–500 m

Distribution

V19-42-distribution-map.gif

Calif., w Mediterranean region, Macaronesia.

Discussion

Artichoke thistle is a noxious weed that tends to spread aggressively in overgrazed range lands and may invade undisturbed natural vegetation as well. Dense infestations form pure stands, sometimes several hec-tares in extent. The long, needlelike spines deter herbivores and the large rosettes suppress the growth of other plants. Vigorous root sprouts can develop from fragments of the deep taproots left in the soil by cultivation or mechanical clearing.

References

None.

Lower Taxa

No lower taxa listed.

AuthorDavid J. Keil +
AuthorityWiklund +
BasionymsAsteraceae tribe Cynareae +
DistributionCalif. +, w Mediterranean region + and Macaronesia. +
Elevation0–500 m +
HabitatDisturbed areas in grasslands, coastal scrub, chaparral, riparian habitats, fallow fields, roadsides +
IllustratorJohn Myers +
Introducedtrue +
PhenologyFlowering spring–summer (Apr–Jul). +
Publication titleBot. J. Linn. Soc. +
Publication year1992 +
ReferenceNone +
Source xmlhttps://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse grained fna xml/V19-20-21/V19 42.xml +
SynonymsCompositae +
Taxon familyAsteraceae +
Taxon nameCynara cardunculus subsp. flavescens +
Taxon parentCynara cardunculus +
Taxon ranksubspecies +
VolumeVolume 19 +