Rhus garwellii
| Rhus garwellii Temporal range:
| |
|---|---|
| |
| R. garwellii leaf fossil | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Sapindales |
| Family: | Anacardiaceae |
| Genus: | Rhus |
| Species: | †R. garwellii
|
| Binomial name | |
| †Rhus garwellii Flynn, DeVore, & Pigg, 2019
| |
Rhus garwellii is an
Washington State, United States. The species was first described from fossil leaves found in the Klondike Mountain Formation. R. garwellii likely hybridized with the other Klondike Mountain formation sumac species R. boothillensis, R. malloryi, and R. republicensis
.
Distribution and paleoenvironment
Rhus garwellii is known from specimens which are recovered from an outcrop of the early Eocene,
golden larch, but also having notable traces of fir, spruce, cypress, and palm.[2] Fossils of Rhus garwellii were described along with descriptions of the coeval species R. boothillensis and R. republicensis plus a redescription of R. malloryi.[1]
Taxonomy
The species was described from a
Georgia College and State University. They published their 2019 type description for R. boothillensis in the International Journal of Plant Sciences.[1] The etymology of the chosen specific name garwellii is a patronym honoring Gar Rothwell recognizing his excitement and dedication for paleobotany.[1] In addition to Rhus garwellii Flynn et al also provided descriptions of the coeval species R. boothillensis and R. republicensis and a gave a redescription of R. malloryi in the 2019 paper. They noted that the Klondike Mountain Formation preserves a number of Rhus specimens which appear to be hybrids of the named species.[1]
Description
Full R. garwellii
petiolules. The 8.5 cm (3.3 in) R. garwell leaflets are elliptical in outline, tapering from the wide middle to the symmetrical base and pointed apex. They have a width of 3.2–4.0 cm (1.3–1.6 in) and a length to width ratio of up to 2.6:1. The teeth along the margin have distinctly pointed tips with convex basal and apical sides running towards angular sinuses.[1]
The
sinuous and connect to either the secondary veins or to the midvein.[1]
References
- ^ S2CID 198244783.
- ^ doi:10.1139/E04-095.
- ^ Wolfe, J.A.; Tanai, T. (1987). "Systematics, Phylogeny, and Distribution of Acer (maples) in the Cenozoic of Western North America". Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and Mineralogy. 22 (1): 1–246.
- doi:10.3133/b1597.