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Helianthus angustifolius L.  

No occurrences found

Family: Asteraceae
swamp sunflower
[Helianthus angustifolius var. planifolius Fern.]
Helianthus angustifolius image
  • FNA
  • Gleason & Cronquist
  • Resources
Edward E. Schilling in Flora of North America (vol. 21)
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. 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).

Vascular plants of NE US and adjacent Canada
Fibrous-rooted perennial with crown-buds, nearly or quite without rhizomes; stem solitary, 0.5-1.5(-2) m, ±hairy, especially below; lvs numerous, sessile or nearly so, commonly alternate except near the base, linear or nearly so and revolute-margined, mostly 5-15(-20) cm נ2-10(-15) mm and 10-30 times as long as wide, dark green and scabrous above, pale beneath with fine, loose, sometimes deciduous hairs, and often also atomiferous-glandular; petiolate basal lvs with broader blade sometimes present; disk red-purple (yellow), (1-)1.5-2 cm wide; invol bracts narrow, at least the inner with loose, narrow tip seldom surpassing the disk; rays (8-)10-15(-21), 1.5-3 cm; 2n=34. Swamps and moist places; L.I. to Fla. and Tex., chiefly near the coast in our range, but inland to s. O., s. Ind., and s. Mo. Aug.-Oct.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
Helianthus angustifolius
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