Phylogenetic Relationships and Taxonomic Status Of the Paleoendemic Fagaceae Of Western North America: Recognition Of A New Genus, Notholithocarpus

By Paul S. Manos, Charles H. Cannon, Sang-Hun Oh. 2008

94 citations recorded by the source corpus.

Abstract We investigated the phylogenetic relationships and taxonomic status of the castaneoid component (Lithocarpus and Chrysolepis) of the family Fagaceae that is endemic to the California Floristic Province (CA-FP). Over 7800 basepairs of nuclear and chloroplast DNA were analyzed in 17 taxa representing the breadth of phylogenetic diversity in the family. The genus Lithocarpus, as currently defined, is clearly polyphyletic due to the inclusion of L. densiflorus. Here, we designate this taxon as a new genus, Notholithocarpus, which can be recognized morphologically by its relatively small, subprolate pollen. Notholithocarpus is more closely related to Quercus, Castanea, and Castanopsis; Chrysolepis was resolved as the sister group to Lithocarpus sensu stricto. These results indicate that Notholithocarpus does not possess true ‘flower cupules,’ which define Lithocarpus sensu stricto, but like the oaks, the single flower per cupule is derived through the abortion of lateral flowers within each cupule. Further study is required to confirm this characteristic. A formal taxonomic treatment is presented with new combinations.

Subfields: Ecology, Evolution, Behavior and Systematics, Plant Science

View Paper: https://www.semanticscholar.org/paper/0f0b43afa179fdcdc2ed48895180a0156e54485f

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Ecology, Evolution, Behavior and Systematics

1. Thomas Denk
2. G. Grimm
3. P. Heenan
4. R. Smissen
5. Stefanie M. Ickert‐Bond
6. Paul S. Manos
7. M. Deng
8. Andrew L. Hipp

In Plant Science

1. Thomas Denk
2. G. Grimm
3. P. Heenan
4. R. Smissen
5. Stefanie M. Ickert‐Bond
6. Z. Nie
7. Jun Wen
8. Andrew L. Hipp

Citations in the corpus

• An updated infrageneric classification of the oaks: review of previous taxonomic schemes and synthesis of evolutionary patterns (2017, background): “This is best illustrated in Manos et al. (2008): one moderately supported main clade comprises the ‘New World Clade’ of oaks and Notholithocarpus, a monotypic Fagaceae genus of western North America; the other major clade comprises the Eurasian Fagaceae Castanea and Castanopsis, and the ‘Old World…”
• Intercontinental disjunctions between eastern Asia and western North America in vascular plants highlight the biogeographic importance of the Bering land bridge from late Cretaceous to Neogene (2016, background): “The phylogenetic evidence supports Notholithocarpus as most closely related to the clade of Castanea Mill., Castanopsis (D. Don) Spach and the north temperate Quercus L., rather than to Lithocarpus of eastern and southeastern Asia.”
• Revised circumscription of Nothofagus and recognition of the segregate genera Fuscospora , Lophozonia , and Trisyngyne (Nothofagaceae) (2013, background): “The monotypic Notholithocarpus was segregated from Lithocarpus and distinguished on the basis of pollen morphology and multiradiate leaf trichomes (Manos et al. 2008).”