Rogersia parlatorii Wang and Dilcher, 2006a

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 : 17

Rogersia parlatorii Wang and Dilcher, 2006a

Figure 9.2, 9.4

Description. Leaf simple; whole lamina and base symmetrical; form narrow elliptic, 7.5 cm long and 1.8 cm wide. Apex probably attenuate. Base acute, decurrent. Margin entire. Petiole normal, 1.1 cm long and 1 mm wide. Primary venation pinnate; primary vein stout, multi-stranded, course straight. Secondary venation festooned brochidodromous; ca. 10 pairs per lamina, opposite or subopposite, decurrent; angle of divergence narrow acute (ca. 30º), with lowest two or three pairs more acute than pairs above; spacing of secondary veins irregular, course uniformly curved; secondary veins joining exmedial branches of superadjacent secondary veins to form two series of loops. Intersecondary veins present, simple. Tertiary veins thin, predominately percurrent; angle of origin AO (acute on the lower side of the secondary and obtuse on the upper side), primary vein-tertiary vein angle oblique; course slightly wavy. Quaternary veins thin, orthogonal reticulate, anastomosing to form pentagonal or quadrangular meshes. Veins of higher order not observed.

Number of specimens examined. 2.

Occurrences. Braun Ranch and Hoisington III localities, Kansas.

Specimens illustrated. UF 15706-7529 ( Figure 9.2, 9.4 ).

Remarks. This species is abundant at the Braun Ranch locality, Kansas. See Table 2 for the differences between this species and other Dakota Formation entire margined leaves.

Figures

FIGURE 9. 1 and 3, Rogersia dakotensis Wang and Dilcher, 2009, UF15706-24798, general leaf shape, note thin secondary veins forming intramarginal veins (scale bar equals 5 mm) (1) and enlargement to show intramarginal veins formed by looping secondary veins (scale bar equals 1 mm) (3). 2 and 4, Rogersia parlatorii Dilcher and Wang, 2006, UF15706-7529, specimen showing leaf shape (scale bar equals 5 mm) (2) and enlargement to show secondary venation (scale bar equals 5 mm) (4).