Difference between revisions of "Helianthus argophyllus"

Torrey & A. Gray

Fl. N. Amer. 2: 318. 1842.

Common names: Silverleaf sunflower
Treatment appears in FNA Volume 21. Treatment on page 149. Mentioned on page 142.
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name=Helianthus argophyllus
 
name=Helianthus argophyllus
|author=
 
 
|authority=Torrey & A. Gray
 
|authority=Torrey & A. Gray
 
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|publication year=1842
 
|publication year=1842
 
|special status=
 
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|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V21_346.xml
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|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/eaa6e58056e40c9ef614d8f47aea294977a1a5e9/coarse_grained_fna_xml/V19-20-21/V21_346.xml
 
|tribe=Asteraceae tribe Heliantheae
 
|tribe=Asteraceae tribe Heliantheae
 
|subtribe=Asteraceae (tribe Heliantheae) subtribe Helianthinae
 
|subtribe=Asteraceae (tribe Heliantheae) subtribe Helianthinae

Revision as of 19:36, 16 December 2019

Annuals, 100–300 cm. Stems (silvery white) erect, usually tomentose or floccose. Leaves mostly cauline; mostly alternate; petioles 2–10 cm; blades ovate to lance-ovate, 15–25 × 10–20 cm, bases truncate to subcordate, margins entire or serrulate, abaxial faces usually floccose, sericeous, or tomentose, gland-dotted. Heads 1–5. Peduncles 2–8 cm. Involucres hemispheric, 20–30 mm diam. Phyllaries 20–35, ovate to lance-ovate, 15–18 × (2–)5–8 mm, apices long-attenuate, abaxial faces usually densely white-villous, gland-dotted. Paleae 10–11 mm, 3-toothed (apices glabrous or sparsely villous). Ray florets 15–20; laminae 20–30 mm. Disc florets 150+; corollas 6.5–7.5 mm, lobes reddish; anthers dark, appendages dark (style branches reddish). Cypselae 4–6 mm, glabrate; pappi of 2 aristate scales 2–2.7 mm. 2n = 34.


Phenology: Flowering late summer–fall.
Habitat: Open areas, sandy soils
Elevation: 0–30+ m

Distribution

V21-346-distribution-map.gif

Fla., N.C., Tex., introduced in South America (Argentina), Africa, Australia.

Discussion

Helianthus argophyllus hybridizes naturally with H. annuus.

Selected References

None.

Lower Taxa

None.
... more about "Helianthus argophyllus"
Edward E. Schilling +
Torrey & A. Gray +
Silverleaf sunflower +
Fla. +, N.C. +, Tex. +, introduced in South America (Argentina) +, Africa +  and Australia. +
0–30+ m +
Open areas, sandy soils +
Flowering late summer–fall. +
Fl. N. Amer. +
Undefined (tribe Undefined) subtribe Lagasceinae +
Helianthus argophyllus +
Helianthus +
species +