Difference between revisions of "Arctotheca calendula"
J. S. African Bot. 8: 284. 1942.
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| − | |basionyms={{Treatment/ID/ | + | |basionyms={{Treatment/ID/Basionym |
|name=Arctotis calendula | |name=Arctotis calendula | ||
|authority=Linnaeus | |authority=Linnaeus | ||
| + | |publication_title=Sp. Pl. | ||
| + | |publication_place=2: 922. 1753 | ||
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|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/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V19_232.xml |
|tribe=Asteraceae tribe Arctotideae | |tribe=Asteraceae tribe Arctotideae | ||
|genus=Arctotheca | |genus=Arctotheca | ||
Revision as of 18:36, 24 September 2019
Plants usually stoloniferous. Leaves obovate, (2–)5–20(–30+) × (1–)2–5(–7) cm, margins pinnati-sect (lyrate to runcinate), remotely prickly, abaxial faces white-pannose, adaxial faces sparsely puberulent to arachnose, usually glandular as well. Heads 4–7 cm diam. (across the rays). Phyllaries: outer reflexed, apices mucronate, white-woolly; inner appressed, margins hyaline, apices rounded, glabrous. Ray florets 11–17(–25); corolla laminae abaxially greenish to purplish, adaxially yellow (drying to basally ochroleucous, apically blue, forming bull’s eye around disc), 10–25 × 2–4 mm, sparsely puberulent, glandular. Disc florets: corollas yellow proximally, bluish distally. Cypselae dark brown, 3 mm, densely woolly; pappi ca. 0.5 mm (usually hidden by hairs on cypselae).
Phenology: Flowering Oct–Aug.
Habitat: Roadsides, old fields, other disturbed habitats
Elevation: 0–300 m
Distribution
Calif., Africa.
Discussion
Most populations of Arctotheca calendula are sterile and spread aggressively by stolons; at least three populations in the flora are fertile and highly invasive. The species is listed by the California Exotic Pest Plant Council (CalEPPC) as a weed with the potential to spread explosively (Red Alert, CDFA A).
Selected References
None.