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Celtis aspera

Magnoliopsida - Urticales - Ulmaceae

Taxonomy
Celtis aspera was named by Manchester (2014) [Newberry J. S. 1868. Notes on the later extinct floras of North America, with descriptions of some new species of fossil plants from the Cretaceous and Tertiary strata. Pt 2. The Tertiary flora of North America. Ann New York Lyc Nat Hist 9:27-76]. It is an impression.

Sister species lacking formal opinion data

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Synonymy list
YearName and author
2002Celtis aspera Manchester et al.
2014Celtis aspera Manchester pp. 727-728 figs. 2-5

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RankNameAuthor
kingdomPlantae
phylumSpermatophyta
classMagnoliopsidaCronquist et al. 1996
classDicotyledonae
subclassDilleniidae
RankNameAuthor
orderUrticales
familyUlmaceaede Mirbel 1815
genusCeltisLinnaeus 1753
speciesaspera

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Diagnosis
ReferenceDiagnosis
S. R. Manchester et al. 2002Leaves simple. Petiole 1-1.5 mm thick, of moderate length (approximately one-third of the length of lamina, 5-30 mm. Lamina ovate to lanceolate, length 2.4-12 cm, width 1.4-7 cm, length/width ratio 1.6-2.6; base symmetrical to less commonly asymmetrical, rounded to cordate, apex attenuate, acute, margin serrate with simple, nonglandular teeth. Teeth acute to obtuse, with straight to convex apical and basal flanks, typically right-angled, with enervation submedial, sinuses acute to right angled. Venation pinnate, midvein straight, secondary veins craspedodromous, straight to slightly curved, six to nine pairs, arising at angles of 20°-45° (avg. 30°) from the midvein; basal pairs commonly with successive abmedial branches extending to the teeth. Tertiary veins oppositely percurrent, straight to convex, closely spaced (0.8-1.3 mm apart), orientation mostly perpendicular to the secondary veins or their branches in lower part of the lamina and mostly perpendicular to the primary vein in the upper half; quaternary veins forming quadrangular to pentagonal areoles giving off quinternary veinlets that are straight, branched, or curved; surface of smaller leaves beset with numerous small bumps. Endocarps globose to subglobose-ovoidal, 2.9-5.0 mm in diameter. Base rounded, apex mostly rounded, but with a beaklike protuberance containing a perforation or canal through which the placentary bundle passes. Surface sculpture consisting of two meridional ribs, one in the plane of suture of the two valves, the other somewhat weaker, defining a plane at right angles to that of the first. Intervening sculpture consisting of a veinlike reticulum of small ridges that outline numerous small depressions. Unilocular with a smooth locule surface.