Ulmus sp. F

Smith, MacKenzie A., Greenwalt, Dale E. & Manchester, Steven R., 2023, Diverse Fruits And Seeds Of The Mid-Eocene Kishenehn Formation, Northwestern Montana, Usa, And Their Implications For Biogeography, Fossil Imprint 79 (1), pp. 37-88 : 55

Ulmus sp. F 1

Text-fig. 7h

M a t e r i a l. USNM PAL 621976.

L o c a l i t y. Disbrow Creek.

D e s c r i p t i o n. Fruit a samara, length 4.3 mm, width 1.9 mm, fruit body excluding stipe and styles 2.8 mm long, wing narrowing (0.3 mm) surrounding central seed body, seed body elliptical 2.1 mm long and 1.3 mm wide, two rectangular, prominent styles 1.2 mm long and 0.7 mm wide emerging apically in a V-shaped configuration.

R e m a r k s. This fruit bears a resemblance to those of Ulmus okanaganensis DENK et DILLHOFF from the early

Eocene of British Columbia and Washington ( Denk and Dillhoff 2005). However, U. okanaganensis lacks a visible wing and has styles that are more tapered and curved to the center ( Denk and Dillhoff 2005). There is also a similarity to fruits named as Ulmus sp. from the same time and area as U. okanaganensis ( Denk and Dillhoff 2005) , but the styles differ from this being more tapered and proximally curved.

Figures

Text-fig. 7. a: USNM PAL 722490 cf. Myriophyllum fruit. Scale bar 1mm. b: USNM PAL 624027 three-valved Populus sp. capsule on pedicel. Scale bar 3mm. c: USNM PAL 717328 Deviacer wolfei samara. Scale bar 5mm. d: USNM PAL 621987 Fabaceae sp. 1 Legume fruit showing persistent style. Scale bar 2mm. e: USNM PAL 625803 Fabaceae sp. 2 fruit. Scale bar 5mm. f: USNM PAL 620816 Agrimonia sp. fruit. Scale bar 3mm. g: Modern Agrimonia pubescens fruit (image by Tracey Slotta, United States Department of Agriculture National Resource Conservation Service Plants Database). h: USNM PAL 621976 Ulmus sp. F1 fruit showing two persistent styles. Scale bar 2mm. i: DMNH EPI.48205 Ulmus sp. L1 leaf. Scale bar 1cm. j: UF 19652-86483 endocarp of Celtis sp. k: UF 19652-86484 Endocarps of Celtis sp.