Difference between revisions of "Cynara cardunculus subsp. flavescens"
Bot. J. Linn. Soc. 109: 120, fig. 15A–D, F–J. 1992.
FNA>Volume Importer |
FNA>Volume Importer |
||
Line 48: | Line 48: | ||
|publication year=1992 | |publication year=1992 | ||
|special status= | |special status= | ||
− | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V19-20-21/V19_42.xml |
|tribe=Asteraceae tribe Cardueae | |tribe=Asteraceae tribe Cardueae | ||
|genus=Cynara | |genus=Cynara |
Revision as of 16:11, 18 September 2019
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
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.
Selected References
None.
Lower Taxa
None.