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Helianthus angustifolius L.
SWAMP SUNFLOWER
Life   Plantae   Dicotyledoneae   Asteraceae   Helianthus

Helianthus angustifolius, Narrowleaf Sunflower
© Copyright Sheryl Pollock 2011 · 8
Helianthus angustifolius, Narrowleaf Sunflower

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Helianthus angustifolius
© Copyright Bobby Hattaway 2011 · 5
Helianthus angustifolius
Helianthus angustifolius
© Copyright Bobby Hattaway 2011 · 5
Helianthus angustifolius

Helianthus angustifolius
© Copyright Bobby Hattaway 2011 · 5
Helianthus angustifolius
Helianthus angustifolius, inflorescence - whole - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Helianthus angustifolius, inflorescence - whole - unspecified

Helianthus angustifolius, inflorescence - whole - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Helianthus angustifolius, inflorescence - whole - unspecified
Helianthus angustifolius, inflorescence - ventral view of flower + perianth
© Copyright Steve Baskauf, 2002-2011 · 4
Helianthus angustifolius, inflorescence - ventral view of flower + perianth

Helianthus angustifolius, inflorescence - ventral view of flower + perianth
© Copyright Steve Baskauf, 2002-2011 · 4
Helianthus angustifolius, inflorescence - ventral view of flower + perianth
Helianthus angustifolius, leaf - basal or on lower stem
© Copyright Steve Baskauf, 2002-2011 · 4
Helianthus angustifolius, leaf - basal or on lower stem

Helianthus angustifolius, stem - showing leaf bases
© Copyright Steve Baskauf, 2002-2011 · 4
Helianthus angustifolius, stem - showing leaf bases
Helianthus angustifolius, stem - showing leaf bases
© Copyright Steve Baskauf, 2002-2011 · 4
Helianthus angustifolius, stem - showing leaf bases

Helianthus angustifolius, leaf - on upper stem
© Copyright Steve Baskauf, 2002-2011 · 4
Helianthus angustifolius, leaf - on upper stem
Helianthus angustifolius, stem - showing leaf bases
© Copyright Steve Baskauf, 2002-2011 · 4
Helianthus angustifolius, stem - showing leaf bases

Helianthus angustifolius, leaf - margin of upper + lower surface
© Copyright Steve Baskauf, 2002-2011 · 4
Helianthus angustifolius, leaf - margin of upper + lower surface
Helianthus angustifolius, fruit - lateral or general close-up
© Copyright Steve Baskauf, 2002-2011 · 4
Helianthus angustifolius, fruit - lateral or general close-up

Hosts · map
FamilyScientific name @ source (records)
_  2007-09-29 19 @ (1)

2007-09-29 19 @ (1)

Associates · map
FamilyScientific name @ source (records)
Aphididae  Uroleucon ( @ NCSU (4)
Apidae  Melissodes tincta @ BBSL (2)
Membracidae  Entylia carinata @ NCSU (1)
Miridae  Lopidea confluenta @ NCSU_ENT (4)
Pucciniaceae  Puccinia helianthi @ BPI (7)

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Following modified from Plants Database, United States Department of Agriculture
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http://plants.usda.gov/java/profile?symbol=HEAN2 ---> https://plants.usda.gov/java/profile?symbol=HEAN2
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Following modified from Flora of North America
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Link to Flora of North America home
 
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FNA Vol. 21 Page 144, 147, 164 , 166 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 21 | Asteraceae | Helianthus

37. Helianthus angustifolius Linnaeus, Sp. Pl. 2: 906. 1753.

Swamp sunflower

Helianthus angustifolius var. planifolius Fernald

Perennials , 50—150+ cm (with crown buds, rhizomes absent or poorly developed). Stems erect, usually ± hairy. Leaves mostly cauline; opposite or alternate; sessile or subsessile; blades (3-nerved near bases) narrowly lanceolate to linear, 8—15 × 0.15—0.5(—1) cm, bases cuneate , margins entire (revolute, abaxial face sometimes obscured by rolled margins), abaxial faces strigose to hispid or hirsute, sometimes (adaxial not) gland-dotted. Heads 3—16. Peduncles 5—15 cm. Involucres shallowly hemispheric, 10—20 mm diam. Phyllaries 25—32 (loose), lanceolate, 4—9 × 1—2 mm, apices acute to slightly acuminate, abaxial faces usually scabrous, rarely glabrous, usually gland-dotted. Paleae (oblanceolate) 5.5—6.5 mm, entire or ± 3-toothed (apices purplish, mucronate, gland-dotted). Ray florets 10—20; laminae 10—20 mm (abaxial faces gland-dotted). Disc florets 75+; corollas 4—4.5 mm, lobes yellow; anthers dark brown or black, appendages dark (style branches usually yellow). Cypselae 2—3 mm, glabrate; pappi of 2 aristate scales 1.5—2.1 mm. 2 n = 34.

Flowering late summer—fall. Open to shaded, usually moist places; 10—700 m; Ala., Ark., Fla., Ga., Ind., Iowa, Ky., La., Md., Miss., Mo., N.J., N.C., Ohio, Okla., Pa., S.C., Tenn., Tex., Va., W.Va.

The distal parts of Helianthus angustifolius are identical in appearance to those of H. simulans ; plants of the latter are taller (200+ cm) and more robust. The leaves are not only narrower in H. angustifolius but also tend to be more strongly revolute (abaxial faces sometimes scarcely visible).

Following modified from CalPhotos
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http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Helianthus+angustifolius&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant ---> https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Helianthus+angustifolius&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant
&pull 20q v4.662 20091102: Error 501 Protocol scheme 'https' is not supported (LWP::Protocol::https not installed) https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Helianthus+angustifolius&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant

Updated: 2018-02-25 04:17:18 gmt
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