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
Heliophily ⓘ: 9
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Horticultural Information
Intro: Erect, often colonial annual of shallow soils over granite on low-elevation granite domes or flatrocks.
Stems: Stems rough-hairy.
Leaves: 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.
Inforescence:
Flowers: 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.
Fruits: Fruit an achene.
Comments:
Height: 1 1/2-3 ft.
plant sale text:
bloom table text:
description: Erect, often colonial annual of shallow soils over granite on low-elevation granite domes or flatrocks.
stems: Stems rough-hairy.
leaves: 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.
inflorescence:
flowers: 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.
fruits: Fruit an achene.
comments:
cultural notes:
germination code:
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