ORIGINAL ARTICLE
Remberella, a new genus of extinct ericalean flower from the Middle Miocene Latah flora of Washington and Idaho, USA
1
Florida Museum of Natural History, Dickinson Hall, Gainesville, Florida 32611-7800, USA
2
University of Minnesota Herbarium, Bell Museum 2088 Larpenteur Ave. West University of Minnesota,
St. Paul, MN 55113, USA
Publication date: 2024-12-31
Acta Palaeobotanica 2024; 64(2): 413-421
HIGHLIGHTS
- Extinct ericalean flowers are recognized from the Miocene of western North America
- Details are revealed by micro-CT scanning and scanning electron microscopy
- Remberella adds to a growing number of Miocene extinct genera
KEYWORDS
ABSTRACT
Small pentamerous floral remains commonly encountered in Middle Miocene lake deposits of the
Latah Formation of Washington and Idaho, USA, previously assigned to Diospyros, are here shown to represent
an extinct genus. Newly recovered specimens preserve characters of the androecium and pollen that were previously
unknown. Remberella microcalyx (Knowlton) gen. et comb. nov. flowers are actinomorphic, with five basally
connate petals having an adnate androecium including ten staminodes and ten stamens. The elongate-triangular
anthers contain finely rugulate, triaperturate pollen. The combination of pentamerous sympetalous corolla, ten staminodes
in two whorls and ten stamens adnate to the corolla indicates affinity with early divergent superasterids,
likely the Ericales, with intriguing similarities to Ebenaceae. Although the Miocene flora includes many genera
confidently assigned to extant genera, Remberella adds to a growing number of contemporary extinct genera.
FUNDING
Florida Museum of Natural History
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| eISSN: | 2082-0259 |
| ISSN: | 0001-6594 |
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