Anisodromum wolfei Upchurch and Dilcher 1990

Wang, Hongshan & Dilcher, David L., 2018, Early Cretaceous angiosperm leaves from the Dakota Formation, Hoisington III locality, Kansas, USA, Palaeontologia Electronica (34 A) 21 (3), pp. 1-49 : 28-30

publication ID

https://doi.org/ 10.26879/841

DOI

https://doi.org/10.5281/zenodo.11187155

persistent identifier

https://treatment.plazi.org/id/03838A22-FF88-AA39-FC93-F983FDE8337F

treatment provided by

Felipe

scientific name

Anisodromum wolfei Upchurch and Dilcher 1990
status

 

Anisodromum wolfei Upchurch and Dilcher 1990

Figure 18 View FIGURE 18

Description. Leaflet lamina and base symmetrical. Shape narrow ovate or elliptic, L / W 2 to 2.6, lamina 3 to 4.7 cm wide and 8 to 9 cm long. Apex missing. Base obtuse. Margin entire. Observed petiolule with a 0.2 to 0.3 mm wide decurrent lamina tissue; petiole 0.5 mm wide and 2 mm long. Primary venation of leaflets pinnate; primary vein stout, multi-stranded, course straight. Secondary venation predominately eucamptodromous; secondary veins moderate relative to primary vein, multi-stranded, ca. nine pairs per lamina, opposite or slightly subopposite, decurrent; angle of divergence moderate acute (45º to 65º), with basal pairs at slightly more obtuse angles; basal secondary veins joining superadjacent secondary veins or their exmedial branches to form loops very close to margin; other secondary veins uniformly curved and diminishing near margin; adjacent secondary veins connected by percurrent tertiary veins. Tertiary veins percurrent, moderate relative to secondary veins; angle of origin AO (acute on exmedial side of secondary vein and obtuse on admedial side of secondary veins) or RO (right on primary vein and obtuse on admedial side of secondary vein); course predominately straight, oriented almost at right angle with primary vein; arrangement close (interval between veins less than 0.5 cm). Quaternary vein orthogonal reticulate. Veins of higher order not observed.

Number of specimens examined. 3.

Specimens illustrated. UF 15706-14818 ( Figure 18.1-2 View FIGURE 18 ); 24566 ( Figure 18.3-4 View FIGURE 18 ).

Remarks. Upchurch and Dilcher (1990) described six specimens from the Rose Creek locality, Nebraska and they proposed that the compound leaves most closely resemble Sapindopsis but they differ in that Anisodromum wolfei has secondary venation that shows asymmetric behavior and much less brochidodromous looping, more percurrent and closely spaced tertiary venation, and a structurally reinforced margin. These characters were interpreted as significant at generic level by analogy to extant pinnately compound Rosidae, where genera are distinguished on the basis of secondary, tertiary, and marginal venation (Upchurch and Dilcher, 1990).

L

Nationaal Herbarium Nederland, Leiden University branch

W

Naturhistorisches Museum Wien

AO

Museo Regionale di Scienze Naturali della Valle d'Aosta

RO

Università degli Studi di Roma La Sapienza

UF

Florida Museum of Natural History- Zoology, Paleontology and Paleobotany

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