Difference between revisions of "Helianthus argophyllus"
Fl. N. Amer. 2: 318. 1842.
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Latest revision as of 23:15, 29 July 2020
Annuals, 100–300 cm. Stems (silvery white) erect, usually tomentose or floccose. Leaves mostly cauline; mostly alternate; petioles 2–10 cm; blades ovate to lanceovate, 15–25 × 10–20 cm, bases truncate to subcordate, margins entire or serrulate, abaxial faces usually floccose, sericeous, or tomentose, glanddotted. Heads 1–5. Peduncles 2–8 cm. Involucres hemispheric, 20–30 mm diam. Phyllaries 20–35, ovate to lanceovate, 15–18 × (2–) 5–8 mm, apices long-attenuate, abaxial faces usually densely white-villous, glanddotted. 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](/w/images/2/27/V21-346-distribution-map.gif)
Fla., N.C., Tex., in South America (Argentina), Africa, Australia
Discussion
Helianthus argophyllus hybridizes naturally with H. annuus.
Selected References
None.