Taxonomy, ecology, and distribution of the genus Rhododendron (Ericaceae) in South Carolina

Horn, Charles N.

doi:10.2179/0008-7475.84.1.33

Cited by 2 publications

(6 citation statements)

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“…Rhododendron eastmanii Kron and Creel (hereafter May-white) was first described from two populations in South Carolina (Kron and Creel 1999). Since then, personal research has resulted in the discovery of numerous populations in 13 counties of South Carolina, mostly in the Broad and Congaree River watersheds (Horn 2005(Horn , 2019. Counties with the largest number of populations include Calhoun, Laurens, Newberry, and Union.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the May-white azalea, a second species of the genus is also known in the SNF, Rhododendron periclymenoides (pinkster azalea). Vegetatively, the two species can be difficult to distinguish as both species have alternate, ovate leaves with hairs on the abaxial surface (Horn 2019). The easiest way to distinguish the two is when they are in flower.…”

mentioning

confidence: 99%

“…The May-white flowers late April to early June (well after leaves have formed) and has white petals, typically with a yellow blotch. The pinkster azalea flowers in March to mid-April (as or shortly after plants break dormancy) and has a pink floral tube with pink to white lobes (Horn 2019). The May-white has floral bracts (which are present September through April) with small marginal dark glands and white ciliate hairs, while the pinkster azalea has only white ciliate hairs (Judd and Kron 2009).…”

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confidence: 99%

“…The May-white has floral bracts (which are present September through April) with small marginal dark glands and white ciliate hairs, while the pinkster azalea has only white ciliate hairs (Judd and Kron 2009). With reference to habitat, the pinkster azalea commonly is found along permanent stream edges, while the May-white is commonly on slopes above permanent or ephemeral streams (Horn 2019).…”

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confidence: 99%

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Scientific Note: A Resurvey of Rhododendron eastmanii (Ericaceae) Populations in the Sumter National Forest, South Carolina

Horn

2023

Castanea

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Rhododendron eastmanii is a species endemic to South Carolina and common in the Enoree Ranger District of the Sumter National Forest. A four-year study was undertaken to revisit known populations and to locate new populations. A total of 2,035 individuals in 38 populations were documented, including 663 seedlings, 705 non-flowering adults, and 667 flowering individuals. Plants were most commonly found on mature hardwood slopes above headwater streams. Pollinator visitors included eastern tiger swallowtail (Papilio glaucus), pipevine swallowtail (Battus philenor), and bumblebees (Bombus spp.). Concerns for the future of the species were noted due to deer browsing and subcanopy shading, especially from Acer leucoderme (a native tree) and Elaeagnus umbellata (an introduced shrub). This survey results in a better understanding of the species distribution and documents its demographic changes over time.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Scientific Note: A Resurvey of Rhododendron eastmanii (Ericaceae) Populations in the Sumter National Forest, South Carolina

Horn

2023

Castanea

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“…Рододендрони в дикому стані найчастіше зустрічаються у районах із помірним та субтропічним кліматом, інколи у субарктичній зоні. Поширені у Північно-Східній Азії, Північній Америці, Південному Китаї, Гімалаях, Японії, Новій Гвінеї, на північному сході Австралії [3,4,5]. В Україні в природних умовах можна зустріти тільки два види: рододендрон жовтий (Rhododendron luteum Sweet) у Поліссі та рододендрон карпатський (Rhododendron myrtifolium Schott & Kotschy) на схилах Карпат.…”

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Research of fatty and organic acids in Rhododendron luteum Sweet leaves

Gaponenko

Mashtaler

Mala

et al. 2021

Farm Zh

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Rhododendron luteum Sweet of the Heath family Ericaceae is found on the territory of Ukraine both in the wild and is widely cultivated in botanical gardens, parks, squares. Leaves and inflorescences are used to treat heart disease, rheumatism, gout, and disorders of the nervous system. The literature data on the chemical composition relate to the presence of aminoacids, organic acids, essential oils, phenolic and triterpene compounds, andromedol derivatives. The aim of the work was to determine the composition and content of fatty and organic acids in the Rhododendron luteum Sweet leaves by gas chromatography-mass spectrometry. The object of the study was the leaves of Rhododendron luteum Sweet, collected on the territory of the botanical garden of H. S. Skovoroda Kharkiv National Pedagogical University in 2019. Gas chromatography - mass spectrometric study of the component composition and content of fatty and organic acids in the leaves of the studied plant on an Agilent Technologies 6890 chromatograph with a 5973 mass spectrometric detector was carried out. In Rhododendron luteum Sweet leaves 37 substances were found and identified. Fatty acids were represented by 17 compounds. Among saturated fatty acids, palmitic acid (3 276.2 mg/kg) was prevailed, among monounsaturated – oleic (736.78 mg/kg), among polyunsaturated – linolenic (1 617.65 mg/kg). The smallest amounts contained heneukocylic (46.33 mg/kg), lauric (58.17 mg/kg) and caproic (68.17 mg/kg) acids, which belong to saturated fatty acids. The presence of 20 organic acids in the raw material was also established: citric (8 680.30 mg/kg) and iso-citric (4 106.85 mg/kg) acids dominated in terms of quantitative content; oxalic (1 685.65 mg/kg) and malic (1 310.82 mg/kg) acids were contained in significant amounts. Among the derivatives of hydroxybenzoic acid, the greatest amount was presented by gentisic (187.76 mg/kg) acid, among the derivatives of hydroxycinnamic acids – p-coumaric (312.62 mg/kg). For the first time, the qualitative composition and quantitative content of fatty and organic acids in Rhododendron luteum Sweet leaves was studied by gas chromatography with a mass spectrometric detector. The obtained results indicate the prospects for further study of raw materials to develop drugs with membrane stabilizing and anti-inflammatory activity.

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Taxonomy, ecology, and distribution of the genus Rhododendron (Ericaceae) in South Carolina

Cited by 2 publications

References 3 publications

Scientific Note: A Resurvey of Rhododendron eastmanii (Ericaceae) Populations in the Sumter National Forest, South Carolina

Scientific Note: A Resurvey of Rhododendron eastmanii (Ericaceae) Populations in the Sumter National Forest, South Carolina

Research of fatty and organic acids in Rhododendron luteum Sweet leaves

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