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Helianthus strumosus L.
PALE-LEAVED SUNFLOWER
Paleleaf woodland sunflower

Life   Plantae   Dicotyledoneae   Asteraceae   Helianthus

Helianthus strumosus, leaf and flower
© Kay Yatskievych, 2003 · 1
Helianthus strumosus, leaf and flower

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Helianthus strumosus
© Copyright Michael Strickland, 2008 · 1
Helianthus strumosus
Helianthus strumosus
© Copyright Michael Strickland, 2008 · 1
Helianthus strumosus

Helianthus strumosus
© Copyright Michael Strickland, 2008 · 1
Helianthus strumosus
Helianthus strumosus
© Copyright Michael Strickland, 2008 · 1
Helianthus strumosus

Helianthus strumosus
© Copyright Michael Strickland, 2008 · 1
Helianthus strumosus
Helianthus strumosus
© Copyright Michael Strickland, 2008 · 1
Helianthus strumosus

Helianthus strumosus
© Copyright Michael Strickland, 2008 · 1
Helianthus strumosus
Helianthus strumosus
© Copyright Michael Strickland, 2008 · 1
Helianthus strumosus

Helianthus strumosus
© Copyright Michael Strickland, 2008 · 1
Helianthus strumosus
Helianthus strumosus
© Copyright Michael Strickland, 2008 · 1
Helianthus strumosus

Helianthus strumosus
© Copyright Michael Strickland, 2008 · 1
Helianthus strumosus
Helianthus strumosus
© Copyright Michael Strickland, 2008 · 1
Helianthus strumosus

Helianthus strumosus
© Copyright Michael Strickland, 2008 · 1
Helianthus strumosus
Helianthus strumosus
© Copyright Michael Strickland, 2008 · 1
Helianthus strumosus

Associates · map
FamilyScientific name @ source (records)
Andrenidae  Andrena aliciae @ AMNH_BEE (1)
Aphididae  Aphis ( @ CSUC_TCN (1)

Uroleucon ( @ NCSU (18)
Apidae  Melissodes illata @ AMNH_BEE (1)
Botryosphaeriaceae  Phyllosticta helianthi @ BPI (1)
Coleosporiaceae  Coleosporium helianthi @ BPI (8)
Cucurbitariaceae  Gibberidea heliopsidis @ BPI (1)
Erysiphaceae  Erysiphe cichoracearum @ BPI (15)
Glomerellaceae  Colletotrichum helianthi @ BPI (3)
Mycosphaerellaceae  Cercospora helianthi @ BPI (1)

Septoria helianthi @ BPI (3)
Peronosporaceae  Plasmopara halstedii @ BPI (7)
Pucciniaceae  Puccinia helianthi-mollis @ BPI (6)

Puccinia helianthi @ BPI (53)

Puccinia tanaceti @ BPI (4)

Uromyces silphii @ BPI (5)
Uropyxidaceae  Aecidium compositarum @ BPI (1)
_  Ascochyta compositarum @ BPI (1)

Montagnella heliopsidis @ BPI (1)

Rosenscheldia heliopsidis @ BPI (2)

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FNA Vol. 21 Page 146, 158, 159 , 162 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 21 | Asteraceae | Helianthus

27. Helianthus strumosus Linnaeus, Sp. Pl. 2: 905. 1753.

Rough sunflower, hélianthe scrofuleux

Helianthus montanus E. Watson; H. saxicola Small

Perennials , 100—200 cm (rhizomatous). Stems erect, glabrous or glabrate. Leaves cauline; mostly opposite, sometimes alternate (distal); petioles 1—3 cm; blades (light to dark green, 3-nerved distal to bases) lanceolate to lance-ovate or ovate, 7—18 × 2—10 cm, bases subcordate to ± cuneate, margins entire to ± serrate, abaxial faces glabrous or tomentulose, usually densely gland-dotted. Heads 3—15. Peduncles 1—9 cm. Involucres cylindric to hemispheric, 8—20 mm diam. Phyllaries 18—25 (erect, loose, or squarrose), lanceolate, 5.5—10 × 1.5—3 mm (equaling or slightly surpassing discs), (margins usually ciliate) apices acute to acuminate, abaxial faces glabrous or hispidulous, usually not gland-dotted. Paleae 5.3—6.5 mm, 3-toothed. Ray florets 10—20; laminae ca. 12—20(—30) mm. Disc florets 35+; corollas 5.5—6.5 mm, lobes yellow; anthers dark, appendages dark or reddish brown. Cypselae 4—5.5 mm, glabrate; pappi of 2 aristate scales (1—)2—2.5 mm. 2 n = 68, 102.

Flowering late summer—fall. Woods , roadsides, prairies; 0—1500 m; Ont., Que.; Ala., Ark., Conn., Del., D.C., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., N.H., N.J., N.Y., N.C., N.Dak., Ohio, Okla., Pa., R.I., S.C., Tenn., Tex., Vt., Va., W.Va., Wis.

Helianthus strumosus is variable, particularly for leaf shape and indument; sufficient study has not been undertaken to evaluate whether regional forms deserve taxonomic recognition. Hybridization with other polyploids, including H. decapetalus, H. hirsutus , and H. tuberosus , further complicates the situation. It differs from H. tuberosus in having glabrous (or glabrate) stems and in lacking tubers.

Updated: 2024-05-24 01:14:28 gmt
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