Porter's sunflower, also known as Stone Mountain or Confederate daisy | |
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Helianthus porteri on Stone Mtn. | |
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Clade: | Asterids |
Order: | Asterales |
Family: | Asteraceae |
Genus: | Helianthus |
Species: | H. porteri
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Binomial name | |
Helianthus porteri (A.Gray) Pruski 1998 not (A.Gray) Heiser 1978 (1978 name not validly published)
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Synonyms [1] | |
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Helianthus porteri is a species of sunflower known by the common names Porter's sunflower, [2] Stone Mountain daisy [3] and Confederate daisy. The term "daisy" is imprecise because the species is a sunflower ( Helianthus) rather than a daisy ( Bellis and related genera). Likewise, although the plant grows on Stone Mountain, GA, its range extends well beyond. The connection to the Confederacy is through Stone Mountain which contains a confederate monument, although the connection is tenuous as the species was named before the Civil War in 1849 by Harvard botanist Asa Gray in honor of Thomas Conrad Porter, a Pennsylvanian minister and botanist who collected the plant in Georgia. [4] Gray initially named the plant Rudbeckia porteri, [5] later changed to Helianthus in 1998 by John F. Pruski. [6]
The species is native to the southeastern United States, including Alabama and Georgia, but has been introduced to granite outcrop areas in North Carolina as an aggressive weed. [7] [8] Helianthus porteri grows on thin soils on and around flat rock granite and gneiss outcrops. [9] It is an annual herb up to 100 cm (40 inches) tall. One plant usually produces 5 or more flower heads, each containing 7 or 8 yellow ray florets surrounding 30 or more yellow disc florets. [10] [11]