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Helianthus grosseserratus M. Martens. Sawtooth Sunflower. Phen: Jul-Oct. Hab: Prairies, fens, pastures, roadsides, disturbed areas. Dist: The original range of this species was apparently centered in OH, IN, IL, IA, and MO, but its exact extent is obscured by its subsequent spread. Reported for NC by Matthews & Mellichamp (1989).

Origin/Endemic status: Native

Synonymy : = Ar, C, F, FNA21, G, GrPl, Il, K1, K3, K4, Mi, NcTx, NE, NY, Oh3, Pa, Tat, Tn, Va, W, WV; = Helianthus grosse-serratus – S, SE1, Tx, orthographic variant; = n/a – RAB

Links to other floras: = Helianthus grosseserratus - FNA21

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Wetland Indicator Status:

  • Atlantic and Gulf Coastal Plain: FAC
  • Eastern Mountains and Piedmont: FACW
  • Great Plains: FACW
  • Midwest: FACW
  • Northcentral & Northeast: FACW

Heliophily : 9

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image of plant© John Gwaltney | Original Image ⭷
image of plant© John Gwaltney | Original Image ⭷
image of plant© John Gwaltney | Original Image ⭷
image of plant© Gary P. Fleming | Original Image ⭷
image of plant© John Gwaltney | Original Image ⭷
image of plant© John Gwaltney | Original Image ⭷
image of plant© Alan Cressler: Helianthus grosseserratus, Dallas County, Alabama 1 by Alan Cressler source | Original Image ⭷

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Horticultural Information

NCBG trait

Intro: Erect, rhizomatous and colonial perennial found on roadsides, fencerows, clearings and other disturbed areas. Introduced from farther west in the U.S.

Stems: Stems simple to much-branched above, red- or purple-tinged, often with a whitish coating.

Leaves: Leaves opposite below and alternate above, petiolate (often winged), lance-shaped, to 8 in. long, coarsely toothed, pinnately veined, rough above and with stiff hairs on both surfaces, sometimes whitish beneath.

Inforescence:

Flowers: Composite flowers (heads) in small clusters or panicles, 2 1/2-4 in. wide, consisting of 10-20 yellow ray florets encircling a center disk of darker yellow, tubular florets. Spreading, sharply pointed, narrow bracts bearing fine hairs around their margins surround the base of each head.

Fruits: Fruit a mottled brown-and-black, narrowly wedge-shaped achene.

Comments:

Height: 3-8 ft.

plant sale text:

bloom table text:

description: Erect, rhizomatous and colonial perennial found on roadsides, fencerows, clearings and other disturbed areas. Introduced from farther west in the U.S.

stems: Stems simple to much-branched above, red- or purple-tinged, often with a whitish coating.

leaves: Leaves opposite below and alternate above, petiolate (often winged), lance-shaped, to 8 in. long, coarsely toothed, pinnately veined, rough above and with stiff hairs on both surfaces, sometimes whitish beneath.

inflorescence:

flowers: Composite flowers (heads) in small clusters or panicles, 2 1/2-4 in. wide, consisting of 10-20 yellow ray florets encircling a center disk of darker yellow, tubular florets. Spreading, sharply pointed, narrow bracts bearing fine hairs around their margins surround the base of each head.

fruits: Fruit a mottled brown-and-black, narrowly wedge-shaped achene.

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cultural notes:

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native range: