Guy L. Nesom

American botanist, writer and botanical collector (1945 - ).

Guy L. Nesom (born August 2, 1945) is an American writer and botanist. Nesom received his Ph.D. in systematic botany from the University of North Carolina in 1980, and has since contributed much to the fields of botanical nomenclature, systematics, and evolution. His most notable contributions are probably his works on the Asteraceae of North America, with several papers published throughout the 1990s that argued for multiple generic names to replace the single polyphyletic name Aster, and his recent and ongoing contributions to the Flora of North America project. Several plant species have b

Abbreviations: G.L.Nesom
Occupations: writer, botanist, botanical collector
Citizenships: United States
Languages: English
Dates: 1945-08-02T00:00:00Z
Birth place: Colorado Springs
Direct attributions: 1,218 plants, 0 fungi
Authorship mentions: 1,243 plants, 0 fungi

1,218 plants attributed, 25 plants contributed to1,243 plants:

Symphyotrichum novaeangliae (New England Aster) (L.) G.L.Nesom 1995
perennial plant species in the asteraceae family
Symphyotrichum novae-angliae (formerly Aster novae-angliae) is a species of flowering plant in the aster family (Asteraceae) native to central and eastern North America. Commonly known as New England aster, hairy Michaelmas-daisy, or Michaelmas daisy, it is a perennial, herbaceous plant usually between 30 and 120 centimeters (1 and 4 feet) tall and 60 to 90 cm (2 to 3 ft) wide. The usually deep purple flowers have up to 100 ray florets which are rarely pink or white. These surround the flower centers which are composed of just as many tiny yellow disk florets. The plant grows naturally in
Symphyotrichum novibelgii (New York Aster) (L.) G.L.Nesom 1995
perennial plant species in the asteraceae family
Symphyotrichum novi-belgii (formerly Aster novi-belgii), commonly called New York aster, is a species of flowering plant. It is the type species for Symphyotrichum, a genus in the family Asteraceae, whose species were once considered to be part of the genus Aster. Plants in both these genera are popularly known as Michaelmas daisy because they bloom around September 29, St. Michael’s Day. The Latin specific epithet novi-belgii (literally "New Belgium") refers not to modern Belgium, but the 17th century Dutch colony New Netherland which was established on land currently occupied by New York
Symphyotrichum lanceolatum (White Panicled Aster) (Willd.) G.L.Nesom 1995
perennial plant species in the asteraceae family
Symphyotrichum lanceolatum (formerly Aster lanceolatus and Aster simplex) is a species of flowering plant in the family Asteraceae native to North America. Common names include panicled aster, lance-leaved aster, and white panicled aster. It is a perennial, herbaceous plant that may reach 1.5 meters (5 feet) tall or more, sometimes approaching 2 m (6+1⁄2 ft). The lance-shaped leaves are generally hairless but may feel slightly rough to the touch on the top because of tiny bristles. S. lanceolatum blooms July to October. The flowers grow in clusters and branch in panicles. They have 16–50
Cartrema americana (Devilwood) (L.) G.L.Nesom 2012
plant species in the oleaceae family
Cartrema americana, commonly called American olive, wild olive, or devilwood, is an evergreen shrub or small tree native to southeastern North America, in the United States from Virginia to Texas, and in Mexico from Nuevo León south to Oaxaca and Veracruz. Cartrema americana was formerly classified as Osmanthus americanus. Following the discovery that Osmanthus was polyphyletic, it was transferred to the segregate genus Cartrema together with Osmanthus floridanus and five Asian species. Cartrema americana grows to 4–7 m (13–23 ft), rarely to 11 m (36 ft) tall. The leaves are 5–14 cm (2.0–5.5
Symphyotrichum ericoides (Heath Aster) (L.) G.L.Nesom 1995
perennial plant species in the asteraceae family
Symphyotrichum ericoides (formerly Aster ericoides), with common names white heath aster, frost aster, and heath aster, is a species of flowering plant in the family Asteraceae native to much of central and eastern North America. It has been introduced to parts of Europe and western Asia. The naturally occurring hybrid species of Symphyotrichum ericoides and Symphyotrichum novae-angliae (New England aster) is named Symphyotrichum × amethystinum and has the common name amethyst aster. It can grow where the two parents are in close proximity.
Symphyotrichum dumosum (Rice Button Aster) (L.) G.L.Nesom 1995
perennial plant species in the asteraceae family
Symphyotrichum dumosum (formerly Aster dumosus) is a species of flowering plant of the family Asteraceae commonly known as rice button aster and bushy aster. It is native to much of eastern and central North America, as well as Haiti and Dominican Republic. It is a perennial, herbaceous plant that may reach a height of 1 meter (3 feet 3 inches).
Peripleura (N.T.Burb.) G.L.Nesom 1994
plant genus in the asteraceae family
Peripleura is a genus of flowering plants in the family Asteraceae.
Eurybia sibirica (Arctic Aster) (L.) G.L.Nesom 1995
perennial plant species in the asteraceae family
Eurybia sibirica, commonly known as the Siberian aster or arctic aster, is an herbaceous perennial native to north western North America and northern Eurasia. It is found largely in open areas of subarctic boreal forests, though it is also found in a wide variety of habitats in the region. It is similar in appearance to Eurybia merita, but their ranges overlap only near the border between the US and Canada, where E. sibirica is generally found at higher elevations. Eurybia sibirica is a perennial herb up to 60 cm (2 feet) tall, spreading by means of thin underground rhizomes. The plant
Apopyros G.L.Nesom 1994
plant genus in the asteraceae family
Apopyros is a genus of flowering plants belonging to the family Asteraceae. Its native range is Brazil to Northeastern Argentina. Species: Apopyros corymbosus (Hook. & Arn.) G.L.Nesom Apopyros warmingii (Baker) G.L.Nesom
Tomentaurum G.L.Nesom 1991
plant genus in the asteraceae family
Tomentaurum is a genus of Mexican plants in the family Asteraceae. Its species are native to northern Mexico.
Mexerion G.L.Nesom 1990
plant genus in the asteraceae family
Mexerion is a genus of flowering plants in the tribe Gnaphalieae within the family Asteraceae. As of May 2024, the number of species accepted varies from one to three.
Iotasperma G.L.Nesom 1994
plant genus in the asteraceae family
Iotasperma are a genus of flowering plants in the composite family Asteraceae, native to Australia. They are erect annual herbs.
Erythranthe lewisii (Lewis's Monkeyflower) (Pursh) G.L.Nesom & N.S.Fraga 2012
perennial plant species in the phrymaceae family
Erythranthe lewisii (Lewis' monkeyflower, great purple monkeyflower) is a perennial plant in the family Phrymaceae. It is named in honor of explorer Meriwether Lewis. Together with other species in Erythranthe, it serves as a model system for studying pollinator-based reproductive isolation. It was formerly known as Mimulus lewisii.
Erythranthe guttata (Yellow Monkey-flower) (DC.) G.L.Nesom 2012
perennial plant species in the phrymaceae family
Erythranthe guttata, with the common names seep monkeyflower and common yellow monkeyflower, is a yellow bee-pollinated annual or perennial flowering plant. It was formerly known as Mimulus guttatus. Erythranthe guttata is a model organism for biological studies, and in that context is still referred to as Mimulus guttatus. There may be as many as 1000 scientific papers focused on this species. The genome is being studied in depth. For combined research of evolution, genetics, and ecology, particularly plant-insect interactions, the yellow monkeyflower has become a model system. With the help
Chloracantha (Spiny Chloracanthas) G.L.Nesom, Y.B.Suh, D.R.Morgan, S.D.Sundb. & B.B.Simpson 1991
plant genus in the asteraceae family
Chloracantha is a monotypic genus of flowering plants in the aster family, containing the single species Chloracantha spinosa. It is distributed in the southwestern and south-central United States (CA NV AZ UT NM TX OK LA), most of Mexico, and much of Central America. Its English language common names include spiny chloracantha, spiny aster, devilweed aster, and Mexican devilweed. In Spanish it is known as espina de agua, espinaza, and espinosilla. This species is a perennial herb or subshrub; its green stems look more herbaceous than woody, "but it behaves more like a subshrub", with its
Aztecaster G.L.Nesom 1993
plant genus in the asteraceae family
Aztecaster is a genus of Mexican flowering plants in the family Asteraceae. Species Aztecaster matudae (Rzed.) G.L.Nesom - Nuevo León, Coahuila, Zacatecas, San Luis Potosí Aztecaster pyramidatus (B.L.Rob. & Greenm.) G.L.Nesom - Oaxaca
Symphyotrichum pilosum (Hairy White Old Field Aster) (Willd.) G.L.Nesom 1995
perennial plant species in the asteraceae family
Symphyotrichum pilosum (formerly Aster pilosus) is a perennial, herbaceous, flowering plant in the Asteraceae family native to central and eastern North America. It is commonly called hairy white oldfield aster, frost aster, white heath aster, heath aster, hairy aster, common old field aster, old field aster, awl aster, nailrod, and steelweed. There are two varieties: Symphyotrichum pilosum var. pilosum, known by the common names previously listed, and Symphyotrichum pilosum var. pringlei, known as Pringle's aster. Both varieties are conservationally secure globally and in most provinces and
Symphyotrichum oblongifolium (Aromatic Aster) (Nutt.) G.L.Nesom 1995
perennial plant species in the asteraceae family
Symphyotrichum oblongifolium (formerly Aster oblongifolius), commonly known as aromatic aster or oblong-leaved aster, is a species of flowering plant in the family Asteraceae and is native to parts of the eastern and central United States. It is an uncommon herbaceous perennial that reaches heights of 10–80 centimeters (4–31 inches) and blooms August–November with many flower heads in various shades of purple.
Eurybia divaricata (White Wood Aster) (L.) G.L.Nesom 1995
perennial plant species in the asteraceae family
Eurybia divaricata (syn. Aster divaricatus), the white wood aster, is an herbaceous plant native to eastern North America. It occurs in the eastern United States, primarily in the Appalachian Mountains, though it is also present in southeastern Canada, in the provinces of Ontario, Quebec and Nova Scotia. In the U.S. it is abundant and common, but in Canada it is considered threatened due to its restricted distribution. It has been introduced to a number of countries in Europe. It can be found in dry open woods as well as along wood-edges and clearings. The species is distinguished by its
Erythranthe moschata (Musk-flower) (Douglas ex Lindl.) G.L.Nesom 2012
perennial plant species in the phrymaceae family
Erythranthe moschata is a species of monkeyflower known by the common names muskflower, musk monkeyflower, and formerly as the common musk, eyebright and musk plant. It was formerly known as Mimulus moschatus.
Erigeron reductus (Little Rayless Fleabane) (Cronquist) G.L.Nesom 1992
perennial plant species in the asteraceae family
Erigeron reductus is a species of flowering plant in the family Asteraceae known by the common name lesser California rayless fleabane. It is endemic to California, from Trinity County south as far as Alameda County and El Dorado County. Erigeron reductus grows in rocky habitats in several mountain ranges in the northern part of the state. It is a perennial herb producing several spreading to erect stems up to 30 centimeters (12 inches) long from a woody caudex and root system. Each stem is lined evenly with small, thready leaves and topped with an inflorescence of one or more flower heads.
Ericameria nauseosa (Rubber Rabbitbrush) (Pall. ex Pursh) G.L.Nesom & G.I.Baird 1993
plant species in the asteraceae family
Ericameria nauseosa (formerly Chrysothamnus nauseosus), commonly known as chamisa, rubber rabbitbrush, and gray rabbitbrush, is a shrub in the sunflower family (Aster) found in the arid regions of western North America. Two subspecies have been described, consimilis (the green form with 8 varieties) and nauseosa (the gray form with 14 varieties).
Symphyotrichum tradescantii (Shore Aster) (L.) G.L.Nesom 1995
perennial plant species in the asteraceae family
Symphyotrichum tradescantii (formerly Aster tradescantii) is a species of flowering plant in the family Asteraceae native to northeastern North America. Common names include Tradescant's aster and shore aster.
Symphyotrichum cordifolium (Common Blue Wood Aster) (L.) G.L.Nesom 1995
perennial plant species in the asteraceae family
Symphyotrichum cordifolium (formerly Aster cordifolius), commonly known as common blue wood aster, heartleaf aster, and blue wood-aster, is a perennial herbaceous flowering plant in the family Asteraceae native to central and eastern North America. It reaches heights of up to 1.2 meters (4 feet) and has bluish daisy-like flowers which bloom late-summer and fall in its range.
Madagaster G.L.Nesom 1993
plant genus in the asteraceae family
Madagaster is a genus of Madagascan plants in the tribe Astereae within the family Asteraceae. Species Madagaster andohahelensis (Humbert) G.L.Nesom Madagaster madagascariensis (Humbert) G.L.Nesom Madagaster mandrarensis (Humbert) G.L.Nesom Madagaster saboureaui (Humbert) G.L.Nesom Madagaster senecionoides (Baker) G.L.Nesom
Erythranthe bicolor (Yellow And White Monkeyflower) (Hartw. ex Benth.) G.L.Nesom & N.S.Fraga 2012
annual plant species in the phrymaceae family
Erythranthe bicolor, the yellow and white monkeyflower, is a species of flowering plant in the lopseed family (Phrymaceae). It is endemic to California, United States. It was formerly known as Mimulus bicolor.
Canadanthus (Aster) G.L.Nesom 1995
plant genus in the asteraceae family
Canadanthus is a North American monotypic genus of flowering plants in the family Asteraceae. The only species is Canadanthus modestus (formerly Aster modestus), commonly known as great northern aster or western bog aster. It is native to most of Canada (Alberta, British Columbia, Manitoba, New Brunswick, Ontario, Saskatchewan, Quebec, and Yukon) and to northern parts of the United States (Alaska, Idaho, Michigan, Minnesota, Montana, North Dakota, Oregon, and Washington).
Ampelaster (Climbing Aster) G.L.Nesom 1995
plant genus in the asteraceae family
Ampelaster is a North American monotypic genus of flowering plants in the family Asteraceae. There is a single known species, Ampelaster carolinianus, with the common name of climbing aster. It is native to the southeastern United States, in the States of Florida, Georgia, North Carolina, and South Carolina. Ampelaster carolinianus is unusual in the family in that it is a climber, using other plants to support its weight. Sometimes it uses adventitious roots to this end. Flower heads are 1–15 per branch, with both ray florets and disc florets, the flowers pale pink to rose-purple.
Xylothamia (Desert Goldenrod) G.L.Nesom, Y.B.Suh, D.R.Morgan & B.B.Simpson 1990
plant genus in the asteraceae family
Xylothamia, the desert goldenrods, is a formerly accepted genus of flowering plants in the family Asteraceae. Until 2003, it was held to contain nine species of shrubs native to the deserts of Mexico and the southwestern United States. As of May 2024, Plants of the World Online divided the nine former species of Xylothamia among Aquilula, Gundlachia, and Medranoa.
Symphyotrichum laurentianum (Gulf Of St. Lawrence Aster) (Fernald) G.L.Nesom 1995
perennial plant species in the asteraceae family
Symphyotrichum laurentianum (formerly Aster laurentianus) is a critically imperiled species of flowering plant in the family Asteraceae endemic to the southern shores of the Gulf of St. Lawrence in Canada. Commonly known as Gulf of St. Lawrence aster, it is an annual, herbaceous plant with one stem and no ray florets that grows up to about 13 centimetres (5 inches) tall.
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