Alnus sp.
|
publication ID |
https://doi.org/10.37520/fi.2023.004 |
|
persistent identifier |
https://treatment.plazi.org/id/4D2487A3-EF4B-8276-FBCF-FBC66D21FF39 |
|
treatment provided by |
Felipe (2024-01-10 22:00:26, last updated 2024-01-10 22:17:14) |
|
scientific name |
Alnus sp. |
| status |
|
Alnus sp. L1
Text-fig. 8a–c View Text-fig
M a t e r i a l. DMNH L6933, DMNH EPI.48136a&b,
DMNH EPI.48179.
L o c a l i t y. Dishbrow Creek.
D e s c r i p t i o n. Leaves simple, elliptical, 5.5–9.2 cm long, 0.7–2.2 mm wide; base and apex acute; petioles 1.6– 2.2 cm long, 0.8–1.1 mm wide; venation pinnate, secondaries arising decurrently, arising at 51° craspedodromous, entering sinuses of large teeth; 0.84 secondaries/cm; tertiaries veins percurrent, opposite and alternate; higher venation not visible; teeth compound, with one large and or two small teeth; large teeth with retroflexed proximal flank, rounded apex and straight distal flank; smaller teeth with concave proximal and distal flanks with acute or rounded apices; 2.68 teeth per cm.
R e m a r k s. Alnus is a microthermal taxon that can be found in riparian areas ( Wing 1987). Fossils of Alnus are known from the early Eocene McAbee, Quilchena and Falkner floras of British Columbia ( Lowe et al. 2018, Mathewes et al. 2016, Smith et al. 2012), Republic flora of Washington ( Pigg et al. 2011), Yellowstone flora of Wyoming ( Wing 1987), the Golden Valley Formation of North Dakota ( Hickey 1977, Wing 1987), mid-Eocene Thunder Mountain flora of Idaho ( Axelrod 1998), White Cliffs flora of the Clarno Formation of Oregon ( Liu et al. 2014), late Eocene Copper Basin flora of Nevada ( Wing 1987), Bull Run flora of Nevada ( Wing 1987), Whitecap Knoll flora of the John Day Formation, Oregon ( Manchester 2000) and Oligocene Ruby Basin of Montana ( Becker 1959) .
Axelrod, D. I. (1998): The Eocene thunder mountain flora of Central Idaho. - University of California Publications Geological Sciences, 142: 1 - 193.
Becker, H. F. (1959): A new species of Mahonia from the Ruby flora of southwestern Montana. - Contributions from the Museum of Paleontology, University of Michigan, 15 (3): 33 - 38.
Hickey, L. J. (1977). Stratigraphy and paleobotany of the Golden Valley Formation (Early Tertiary) of western North Dakota. - Memoirs of the Geological Society of America, 150: 1 - 181.
Liu, X., Manchester, S. R., Jin, J. (2014): Alnus subgenus Alnus in the Eocene of western North America based on leaves, associated catkins, pollen, and fruit. - American Journal of Botany, 101 (11): 1925 - 1943. https: // doi. org / 10.3732 / ajb. 1400228
Lowe, A. J., Greenwood, D. R., West, C. K., Galloway, J. M., Sudermann, M., Reichgelt, T. (2018): Plant community ecology and climate on an upland volcanic landscape during the early Eocene Climatic Optimum: McAbee Fossil Beds, British Columbia, Canada. - Palaeogeography, Palaeoclimatology, Palaeoecology, 511: 443 - 338. https: // doi. org / 10.1016 / j. palaeo. 2018.09.010
Manchester, S. R. (2000): Late Eocene fossil plants of the John Day Formation, Wheeler County, Oregon. - Oregon Geology, 62: 51 - 63.
Mathewes, R. W., Greenwood, D. R., Archibald, S. B. (2016): Paleoenvironment of the Quilchena flora, British Columbia, during the early Eocene Climatic Optimum. - Canadian Journal of Earth Sciences, 53: 1 - 17. https: // doi. org / 10.1139 / cjes- 2015 - 0163
Pigg, K. B., DeVore, M. L., Volkman, K. E. (2011): Fossil Plants from Republic: A Guidebook. - Stonerose Interpretive Center, Republic, Washington, 86 pp.
Smith, R. Y., Basinger, J. F., Greenwood, D. R. (2012): Early Eocene plant diversity and dynamics in the Falkland flora, British Columbia, Canada. - Palaeobiodiversity and Palaeoenvironments, 92: 309 - 328. https: // doi. org / 10.1007 / s 12549 - 011 - 0061 - 5
Wing, S. L. (1987): Eocene and Oligocene floras of the Rocky Mountains. - Annals of the Missouri Botanical Garden, 74 (4): 748 - 784. https: // doi. org / 10.2307 / 2399449
Text-fig. 8. Betulaceae and Juglandaceae from the Kishenehn Formation. a: DMNH L6933 Alnus sp. L1 leaves. Scale bar 2cm. b: DMNH EPI.48179 Alnus sp. leaf. Scale bar 2cm. c: DMNH EPI.48136b Alnus sp. leaf. Scale bar 2cm. d: USNM PAL 622756 Alnus sp. I1 infructescence attached to branch. Scale bar 1cm. e: USNM PAL 623160 Betuloideae showing wing, seed body and two persistent styles. Scale bar 1mm. f: USNM PAL 622732 Alnus sp. F1 samara showing two persistent styles. Scale bar 1mm. g: USNM PAL 624925 Betula sp. samara showing wing, seed body and two persistent styles. Scale bar 1mm. h: USNM PAL 623147 Alnus sp. F2 samara showing. Scale bar 1mm. i: USNM PAL 622690 Palaeocarya sp. samara showing three wings with reticulate venation and hairs at base. Scale bar 1cm.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
|
Kingdom |
|
|
Phylum |
|
|
Class |
|
|
Order |
|
|
Family |
|
|
Genus |