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Polygonocarpum johnsonii
Polygonocarpum johnsonii Manchester, E. O’Leary Bot. Rev. (Lancaster), 76(1): 69. Mar 2010
- Name
- Polygonocarpum johnsonii
- Rank
- Species
- Generic Name
- [Genus] Polygonocarpum
- Authors (Pub.)
- Manchester S. R.
O’Leary E. L.
- Publication
- Phylogenetic distribution and identification of fin-winged fruits [2010/3]
- Journal
- Botanical Review
- Volume
- 76
- Issue
- 1
- Page number
- 69
- Year
- 2010
- Fossil Status
- fruits
- Stratigraphy
- Maastrichtian
- Location
- Slope County, North Dakota, USA
- Paleoregion
- America (North)
Data for Holotypus
- Repository
- Denver Museum of Nature and Science, DMNH, Denver, USA
- Repository Number
- DMNH 16608
Data for Paratypus
- Repository
- Yale Peabody Museum of Natural History, New Haven, USA
- Repository Number
- YPM 6173
- Diagnosis
- Fruit an elliptical to nearly circular samara, 6.5–9.5 mm high, 6.5–
8.2 mm wide, with emarginate apex and base. Two (possibly 3?) lateral wings spreading from the central axis. Achene fusiform, pedicel and style unknown.
Wings supplied with very fine fusiform-reticulate venation radiating from the
central axis with a high vein density of 6 per mm. Fimbrial vein lacking, but
with an arched longitudinal intramarginal vein (well inset from the wing margin)
in each wing running parallel to the edge of the achene about 1 mm beyond the
achene margin.
