Difference between revisions of "Arctotheca calendula"

(Linnaeus) Levyns

J. S. African Bot. 8: 284. 1942.

Basionym: Arctotis calendula Linnaeus
Synonyms: Cryptostemma calendula (Linnaeus) Druce
Treatment appears in FNA Volume 19. Treatment on page 197.
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|elevation=0–300 m
 
|elevation=0–300 m
 
|distribution=Calif.;Africa.
 
|distribution=Calif.;Africa.
|discussion=<p>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).</p>
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|discussion=<p>Most populations of <i>Arctotheca calendula</i> 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).</p>
 
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|publication year=1942
 
|publication year=1942
 
|special status=
 
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|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V19-20-21/V19_232.xml
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|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/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 16:10, 18 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

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.

Lower Taxa

None.