Overview

Distribution

National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Physical Description

Morphology

Description

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. 2n = 34.
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Diagnostic Description

Synonym

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Ecology

Associations

Flower-Visiting Insects of Narrow-Leaved Sunflower in Illinois

Helianthus angustifolius (Narrow-Leaved Sunflower)
(information is restricted to Andrenid bees; observations are from Krombein et al.)

Bees (short-tongued)
Andrenidae (Andreninae): Andrena accepta cp olg (Kr), Andrena aliciae cp olg (Kr)

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Helianthus angustifolius

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 2
Species With Barcodes: 1
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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: N5 - Secure

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

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Wikipedia

Helianthus angustifolius

Helianthus angustifolius is a species of sunflower known by the common name narrowleaf sunflower or swamp sunflower. It is native to the central and eastern United States.[1] It is typically found in the coastal plain habitat (both the Atlantic and Gulf), particularly in wet areas. It is often cultivated for its bright, showy yellow flowers.

References[edit]

  1. ^ Helianthus angustifolius. Germplasm Resources Information Network (GRIN).
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Notes

Comments

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).
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