Compilation
Rudbeckia porteri

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Name

Identification
Helianthus porteri (A. Gray) Heiser [family ASTERACEAE ] (stored under name); Verified by C. B. Heiser, Rudbeckia porteri A. Gray [family ASTERACEAE ] Verified by A. Gray, 1849
Related name
  • Helianthus porteri
  • Gymnolomia porteri
  • Rudbeckia porteri
Common name
  • Confederate daisy, Flora of North America Vol. 21

Flora

Entry for Helianthus porteri (A. Gray) Pruski [family COMPOSITAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 21,
Names
Helianthus porteri (A. Gray) Pruski [family COMPOSITAE], Castanea, 63: 75. 1998
Rudbeckia porteri A. Gray [family ], Mem. Amer. Acad. Arts, n. s., 4: 83. 1849
Heliomeris porteri (A. Gray) Cockerell [family COMPOSITAE]
Viguiera porteri (A. Gray) S. F. Blake [family COMPOSITAE]
Treatment Author(s)
Edward E. Schilling
Information
Annuals, 40–100 cm. Stems erect, usually sparsely strigose, sometimes hispid as well. Leaves mostly cauline; opposite (proximal) or alternate; petioles 0–0.2 cm; blades (± 3-nerved distal to bases) narrowly lanceolate to linear, 5–11.5 × 0.15–1 cm, bases cuneate, margins entire (often ± ciliate proximally), faces sparsely strigose or scabrous to glabrate, sparsely gland-dotted. Heads usually 5+. Peduncles 1–10 cm. Involucres hemispheric, 5–6 mm diam. Phyllaries 11–17, linear, 5.5–8 × 0.8–1.3 mm (margins sparsely hispido-ciliate, hairs 0.5–1.2 mm), apices acute to acuminate, abaxial faces glabrate, not gland-dotted. Paleae (ovate) 3.5–4.6 mm, entire (1-toothed). Ray florets 7–8; laminae (10–)15–20 mm. Disc florets 30+; corollas 2.8–3.5 mm, lobes yellow; anthers dark, appendages dark. Cypselae 2.2–2.3 mm, sparsely puberulent (bases and apices); pappi 0. 2n = 34.
Phenology
sep-nov (fall)
Altitude range
200–500+ m;
Distribution
USA Ala.USA Ga.USA N.C.USA S.C.
Discussion
Helianthus porteri was established at Rocky Face Mountain, North Carolina, following its introduction as part of an ecologic experiment. Where it occurs, H. porteri produces conspicuous massed floral displays when in bloom. It is remarkably similar morphologically in its reduced habit, epappose cypselae, conic receptacles, and unlobed, mucronate pales to Heliomeris (Viguiera sect. Heliomeris), and it is treated under Viguiera in most southeastern United States treatments; its style appendages and chromosome number agree with molecular phylogenetic data in placing it within Helianthus.

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