A great paper on the taxonomy of sect. Lobatae and sect. Quercus is "An Updated Infrageneric Classification of the North American Oaks (Quercus Subgenus Quercus): Review of the Contribution of Phylogenomic Data to Biogeography and Species Diversity". It provides good descriptions and evidence for multiple clades that help simplify the taxonomy of Quercus species. Here I'll outline the basic taxonomic structure the paper provides
Sect. Lobatae
Subsect. Agrifoliae: Q. agrifolia, Q. kelloggii, Q. parvula, Q. wislizeni
"Subevergreen complex" (Q. agrifolia complex): Q. agrifolia, Q. parvula, Q. wislizeni
Subsect. Palustres: Q. palustris, Q. texana
Subsect. Coccineae: Q. acerifolia, Q. buckleyi, Q. coccinea, Q. ellipsoidalis, Q. rubra, Q. shumardii, Q.
velutina
Q. shumardii complex: Q. acerifolia, Q. buckleyi, Q. shumardii, Q. rubra
Q. coccinea complex*: Q. velutina, Q. coccinea, Q. ellipsoidalis
Subsect. Phellos: Q. arkansana, Q. elliottii, Q. falcata, Q. georgiana, Q. hemispherica, Q. ilicifolia, Q.
imbricaria, Q. incana Q. inopina, Q. laevis, Q. laurifolia, Q. marilandica, Q. myrtifolia, Q. nigra, Q.
pagoda, Q. phellos
Q. incana complex*: Q. hemisphaerica, Q. incana, Q. myrtifolia, Q. inopina
Q. ilicifolia complex*: Q. ilicifolia Q. georgiana Q. imbricaria
Q. phellos complex*: Q. pumila, Q. pagoda, Q. phellos, Q. laurifolia, Q. nigra, Q. arkansana
Q. marilandica complex*: Q. laevis, Q. marilandica, Q. falcata
Sect. Quercus
Subsect. Dumosae: Q. berberidifolia, Q. cornelius-mulleri, Q. douglasii, Q. dumosa, Q. durata, Q.
gambelii, Q. garryana, Q. john-tuckeri, Q. lobata, Q. pacifica
Grade (not monophyletic): Q. gambelii, Q. garryana, Q. lobata
Q. berberidifolia—Q. durata complex (Q. berberidifolia complex for INat): Q. berberidifolia, Q. durata
Q. dumosa complex*: Q. pacifica, Q. dumosa, Q. cornelius-mulleri, Q. john-tuckeri, Q. douglasii
Subclade: Q. cornelius-mulleri, Q. john-tuckeri, Q. douglasii (would not be included in INat taxonomy)
Subsect. Prinoideae: Q. bicolor, Q. lyrata, Q. macrocarpa, Q. muehlenbergii, Q. prinoides
Q. prinoides complex*: Q. muehlenbergii, Q. prinoides
Q. lyrata complex*: Q. bicolor, Q. lyrata, Q. macrocarpa
Subsect. Albae: Q. alba, Q. michauxii, Q. montana
Subsect. Stellatae: Q. austrina, Q. boyntonii, Q. chapmanii, Q. havardii, Q. margettae, Q. oglethorpensis,
Q. similis, Q. sinuata, Q. stellata
Q. austrina complex* (which species was named first is unclear) : Q. austrina, Q. margarettae
Q. chapmanii complex*: Q. chapmanii, Q. havardii
Q. stellata complex*: Q. stellata, Q. similis, Q. boyntonii
Subsect. Polymorphae: Q. hinckleyi, Q. laceyi, Q. mohriana, Q. polymorpha, Q. pungens, Q. vaseyana
Q. vaseyana complex*: Q. hinckleyi, Q. pungens, Q. vaseyana
*Not specifically named in the paper but given a name based off of the most senior specific epithet in the group
Manos PS, Hipp AL. An Updated Infrageneric Classification of the North American Oaks (Quercus Subgenus Quercus): Review of the Contribution of Phylogenomic Data to Biogeography and Species Diversity. Forests. 2021; 12(6):786. https://doi.org/10.3390/f12060786
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Question regarding the origin of the clade taxa: I had extracted the binomial taxa, figure 2, for each of the Manos & Hipp subsection but did not partition the clades. I identified the subsection taxa from the graphic. The clade appears to have been extracted from the link to the maps and tables. I have not found the clade data. Can you provide a link?
The clade data I got from reading through the "Section Lobatae–(37/ca. 120)" and "Section Quercus–(45/ca. 150)" parts of the article. There may be one or two not in there but this is everything specifically mentioned in those sections.
POWO lists Quercus elliottii as a synomun.
I believe it's just a different name for Q. pumila as pumila is not mentioned in the paper
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