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Helianthus porteri (A. Gray) Pruski. Common name: Confederate Daisy. Phenology: Aug-Sep. Habitat: In shallow soils over granite on low-elevation granite domes or flatrocks. Distribution: A Piedmont endemic: nw. SC south to GA and ec. AL

Origin/Endemic status: Endemic

Taxonomy Comments: The species has often been treated in Viguiera; see Pruski (1998) and Schilling et al. (1998) for discussion of the reasons for treating this species in Helianthus. It is well-established at two sites in NC, on Rocky Face Mountain (Alexander County, NC) and Mitchell Mill Flatrock (Wake County, NC), where it was introduced with soil blocks of Diamorpha smallii as part of an ecological experiment (Mellinger 1972; McCormick & Platt 1964); it is now aggressively weedy at these sites.

Synonymy : = FNA21, K4; = n/a — RAB; = Viguiera porteri (A.Gray) Blake — S, SE1

Links to other floras: = Helianthus porteri - FNA21

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Heliophily : 9

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image of plant© Scott Ward | Original Image ⭷
image of plant© Alan Cressler: helianthus porteri, davidson-arabia mountain nature preserve, dekalb county, georgia 2 by Alan Cressler source
image of plant© Alan Cressler: helianthus porteri, stone mountain, stone mountain park, dekalb county, georgia 11 by Alan Cressler source
image of plant© Scott Ward | Original Image ⭷
image of plant© Alan Cressler: Helianthus porteri, Stone Mountain, Stone Mountain Park, Dekalb County, Georgia 1 by Alan Cressler source
image of plant© Scott Ward | Original Image ⭷
image of plant© Scott Ward | Original Image ⭷
image of plant© Alan M. Cressler | Original Image ⭷
image of plant© Alan Cressler: Helianthus porteri, Stone Mountain, Stone Mountain Park, DeKalb County, Georgia 8 by Alan Cressler source
image of plant© Alan Cressler: Helianthus porteri, Stone Mountain, Stone Mountain Park, DeKalb County, Georgia 11 by Alan Cressler source | Original Image ⭷
image of plant© Alan Cressler: Helianthus porteri, Stone Mountain, Stone Mountain Park, Dekalb County, Georgia 3 by Alan Cressler source | Original Image ⭷
image of plant© Alan M. Cressler | Original Image ⭷
image of plant© Alan Cressler: Helianthus porteri, Stone Mountain, Stone Mountian Park, DeKalb County, Georgia 3 by Alan Cressler source | Original Image ⭷
image of plant© Alan Cressler: Helianthus porteri, Stone Mountain, Stone Mountain Park, DeKalb County, Georgia 1 by Alan Cressler source
image of plant© Alan Cressler: helianthus porteri, stone mountain, stone mountain park, dekalb county, georgia 8 by Alan Cressler source

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Horticultural Information

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native range
Erect, often colonial annual of shallow soils over granite on low-elevation granite domes or flatrocks.
Stems rough-hairy.
Leaves opposite below and alternate above, short-petiolate to sessile, linear and tapering at both ends, to 4 1/2 in. long, with fringed margins toward the base and rough-hairy and gland-dotted above.
Composite flowers (heads) in small terminal clusters; heads 1 1/2-2 in. wide, consisting of 7-8 yellow ray florets encircling a center disk of yellow tubular florets. Overlapping, narrow, pointed bracts surround the base of each head.
Fruit an achene.
1 1/2-3 ft.
Erect, often colonial annual of shallow soils over granite on low-elevation granite domes or flatrocks.
Stems rough-hairy.
Leaves opposite below and alternate above, short-petiolate to sessile, linear and tapering at both ends, to 4 1/2 in. long, with fringed margins toward the base and rough-hairy and gland-dotted above.
Composite flowers (heads) in small terminal clusters; heads 1 1/2-2 in. wide, consisting of 7-8 yellow ray florets encircling a center disk of yellow tubular florets. Overlapping, narrow, pointed bracts surround the base of each head.
Fruit an achene.


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