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Helianthus giganteus L.
GIANT SUNFLOWER
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)
Halictidae  Halictus ligatus @ AMNH_BEE (1)

Lasioglossum zonulum @ AMNH_BEE (1)
_  Crepusia fuliginosa @ AMNH_IZC (29)

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Following modified from Delaware Wildflowers
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Delaware Wildflowers  •  Scientific names

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

Guide to Helianthus of Delaware

More information on this plant, from other sources.


Copyright David G. Smith

Delaware Wildflowers main page

Following modified from Plants Database, United States Department of Agriculture
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http://plants.usda.gov/java/profile?symbol=HEGI ---> https://plants.usda.gov/java/profile?symbol=HEGI
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Following modified from Flora of North America
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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).

Following modified from CalPhotos
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CalPhotos     Photo Database

 

Number of matches : 24
Query: SELECT * FROM img WHERE ready=1 and taxon like "Helianthus giganteus%" and (lifeform != "specimen_tag" OR lifeform != "Plant") ORDER BY taxon

Click on the thumbnail to see an enlargement

Helianthus giganteus
Helianthus giganteus
Tall Sunflower
ID: 0000 0000 0906 0473 [detail]
© 2006 Matt Below

Helianthus giganteus
Helianthus giganteus
Giant Sunflower
ID: 3333 3333 1007 1304 [detail]
© University and Jepson Herbaria

Helianthus giganteus
Helianthus giganteus
Giant Sunflower
ID: 0000 1111 1234 1803 [detail]
© 2016 Keir Morse

Helianthus giganteus
Helianthus giganteus
Giant Sunflower
ID: 0000 1111 1234 1804 [detail]
© 2016 Keir Morse

Helianthus giganteus
Helianthus giganteus
Giant Sunflower
ID: 0000 1111 1234 1805 [detail]
© 2016 Keir Morse

Helianthus giganteus
Helianthus giganteus
Giant Sunflower
ID: 0000 1111 1234 1806 [detail]
© 2016 Keir Morse

Helianthus giganteus
Helianthus giganteus
Giant Sunflower
ID: 0000 1111 1234 1807 [detail]
© 2016 Keir Morse

Helianthus giganteus
Helianthus giganteus
Giant Sunflower
ID: 0000 1111 1234 1808 [detail]
© 2016 Keir Morse

Helianthus giganteus
Helianthus giganteus
Giant Sunflower
ID: 0000 1111 1234 1809 [detail]
© 2016 Keir Morse

Helianthus giganteus
Helianthus giganteus
Giant Sunflower
ID: 0000 1111 1234 1810 [detail]
© 2016 Keir Morse

Helianthus giganteus
Helianthus giganteus
Giant Sunflower
ID: 0000 1111 1234 1811 [detail]
© 2016 Keir Morse

Helianthus giganteus
Helianthus giganteus
Giant Sunflower
ID: 0000 1111 1234 1812 [detail]
© 2016 Keir Morse

Helianthus giganteus
Helianthus giganteus
Giant Sunflower
ID: 0000 1111 1234 1813 [detail]
© 2016 Keir Morse

Helianthus giganteus
Helianthus giganteus
Giant Sunflower
ID: 0000 1111 1234 1814 [detail]
© 2016 Keir Morse

Helianthus giganteus
Helianthus giganteus
Giant Sunflower
ID: 0000 1111 1234 1815 [detail]
© 2016 Keir Morse

Helianthus giganteus
Helianthus giganteus
Giant Sunflower
ID: 0000 1111 1234 1816 [detail]
© 2016 Keir Morse

Helianthus giganteus
Helianthus giganteus
Giant Sunflower
ID: 0000 1111 1234 1817 [detail]
© 2016 Keir Morse

Helianthus giganteus
Helianthus giganteus
Giant Sunflower
ID: 0000 1111 1234 1818 [detail]
© 2016 Keir Morse

Helianthus giganteus
Helianthus giganteus
Giant Sunflower
ID: 0000 1111 1234 1819 [detail]
© 2016 Keir Morse

Helianthus giganteus
Helianthus giganteus
Giant Sunflower
ID: 0000 1111 1234 1820 [detail]
© 2016 Keir Morse

Helianthus giganteus
Helianthus giganteus
Giant Sunflower
ID: 0000 1111 1234 1821 [detail]
© 2016 Keir Morse

Helianthus giganteus
Helianthus giganteus
Giant Sunflower
ID: 0000 1111 1234 1822 [detail]
© 2016 Keir Morse

Helianthus giganteus
Helianthus giganteus
Giant Sunflower
ID: 0000 1111 1234 1823 [detail]
© 2016 Keir Morse

Helianthus giganteus
Helianthus giganteus
Giant Sunflower
ID: 0000 1111 1234 1824 [detail]
© 2016 Keir Morse

Using these photos: A variety of organizations and individuals have contributed photographs to CalPhotos. Please follow the usage guidelines provided with each image. Use and copyright information, as well as other details about the photo such as the date and the location, are available by clicking on the [detail] link under the thumbnail. See also: Using the Photos in CalPhotos .   


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