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Helianthus giganteus L.
Life   Plantae   Dicotyledoneae   Asteraceae   Helianthus

Helianthus giganteus, Tall Sunflower
© Copyright Sheryl Pollock 2011 · 9
Helianthus giganteus, Tall Sunflower

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Helianthus giganteus, Tall Sunflower
© Copyright Sheryl Pollock 2011 · 8
Helianthus giganteus, Tall Sunflower
Helianthus giganteus, Tall Sunflower
© Copyright Sheryl Pollock 2011 · 1
Helianthus giganteus, Tall Sunflower

Associates · map
FamilyScientific name @ source (records)
Andrenidae  Perdita bequaerti @ AMNH_BEE (3)
Aphididae  Prociphilus ( @ NCSU (1)

Uroleucon ( @ NCSU (29)
Botryosphaeriaceae  Phyllosticta helianthi @ BPI (1)
Coleosporiaceae  Coleosporium helianthi @ BPI (6)
Diaporthaceae  Diaporthe orthoceras @ BPI (1)
Erysiphaceae  Erysiphe cichoracearum @ BPI (8)
Halictidae  Halictus ligatus @ AMNH_BEE (1)

Lasioglossum zonulum @ AMNH_BEE (1)
Mycosphaerellaceae  Septoria helianthi @ BPI (2)
Peronosporaceae  Plasmopara halstedii @ BPI (1)
Pucciniaceae  Puccinia helianthi @ BPI (37)
_  Cicinobolus cesatii @ BPI (1)

Crepusia fuliginosa @ AMNH_IZC (29)

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Delaware Wildflowers  •  Scientific names

Helianthus giganteus L. Tall Sunflower
Asteraceae — Aster family
Helianthus giganteus
Nottingham County Park (PA)
September 2006 Helianthus giganteus
Stroud Preserve (PA)
September 2013

Guide to Helianthus of Delaware

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Photos copyright David G. Smith

Information from the Delaware Flora Checklist used with author's permission.

Delaware Wildflowers main page

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FNA Vol. 21 Page 147, 163, 165 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 21 | Asteraceae | Helianthus

41. Helianthus giganteus Linnaeus, Sp. Pl. 2: 905. 1753.

Giant or tall sunflower, hélianthe géant

Helianthus alienus E. Watson; H. validus E. Watson

Perennials , 100—400 cm (rhi-zomatous). Stems (usually reddish) erect, hairy. Leaves cauline; mostly alternate; petioles 0—1.2 cm (ciliate); blades (3-nerved from bases) lanceolate to lance-ovate, 7—20 × 1.2—3.5 cm, bases cuneate, margins serrulate to subentire (± flat), abaxial faces scabrous or ± hirsute, sometimes gland-dotted. Heads 1—12. Peduncles 8—12 mm. Involucres hemispheric, 10—24 mm diam. Phyllaries 20—25 (loose or spreading), linear, 8—15 × 1.2—2 mm, (margins usually ciliate) apices acute to attenuate , abaxial faces sparsely strigose, not gland-dotted. Paleae 7—9 mm, entire or ± 3-toothed (apices acute, hairy). Ray florets 12—20; laminae (often pale yellow) 15—25 mm (abaxial faces not gland-dotted). Disc florets 60+; corollas 5—6 mm, lobes yellow; anthers dark brown or black, appendages dark. Cypselae 3—4 mm, glabrate; pappi of 2 aristate scales 2.4—3 mm. 2 n = 34.

Flowering late summer—fall. Usually wet, open sites; 10—600+ m; N.B., Nfld. and Labr. (Nfld.), N.S., Ont., Que.; Conn., Del., D.C., Ga., Ill., Ind., Iowa, Kans., Ky., Maine, Md., Mass., Mich., Minn., Miss., N.J., N.Y., N.C., Ohio, Pa., S.C., Tenn., Vt., Va., W.Va., Wis.

Helianthus giganteus was probably introduced in Newfoundland. It intergrades with H. nuttallii and H. grosseserratus ; it is distinctive in its hairy, reddish-colored stems, dark anther appendages, and prominent setae on the petioles. The natural hybrid of H. giganteus with H. grosseserratus has been called H. luxurians E. Watson (R. W. Long 1954). Hybrids of H. giganteus with H. divaricatus have been referred to as H . ambiguus (Torrey & A. Gray) Britton and H . × divariserratus R. W. Long (Long 1954).

Updated: 2024-07-21 08:18:03 gmt
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