USNM 37651 Grewia alaskana Hollick  

Notes

Hollick (1930)

P. 82 Fig. 1

 

 

Locality

From Hollick (1930) (p. 107)

"Coal mine in Coal Bluff, Herendeen Bay, Alaska Peninsula (original No. 31); collected by W. W. Atwood and H. M. Eakin in 1908 (lot 5185)."

 

Locality Map

 

Description

From Hollick (1930) (p. 107)

"Plate 82, Figure 1"

"Leaf petiolate, orbicular-cordate, slightly inequilateral, 6 centimeters in length, exclusive of the petiole, by 6 centimeters in width; margin crenate-dentate except at the base, the crenations largest just above the middle, diminishing in size above and below; apex obtuse; base broadly cordate; nervation palmate from the base, campto-craspedodrome; lateral primaries three on each side, ascending, consisting of a strong inner pair and a weak exterior and intermediate pair, with upward and inward curving branches on the outer sides that connect by fine cross nervation near the margin and give off fine short nervilles that extend to and terminate in the crenations; secondary nerves two on each side of the midrib above the middle, weak and inconspicuous, merging into the inner lateral primaries toward the summit."

 

Remarks

From Hollick (1930) (p. 107)

"The genus Grewia has not been heretofore recognized, so far as I am aware, in any formation older than Eocene; but the generic characters in our specimen appear to be well defined, and the species resembles certain forms of Grewia crenata (Unger) Heer(1859) (p. 42, pl. 109, figs. 12-21; pl. 110, figs. 1-11 [=Dombeyopsis crenata Unger, Genera et species plantarum fossilium, p. 448, Vienna, 1850]) especially those from Svalbard (Heer 1876) (p. 4, pl. 19, figs 12a, 13, 14, 16, 17). In fact, the differences are so slight that our specimen might be regarded as merely varietally rather than specifically different from G. crenata. In ours the basal sinus is broader and shallower, the crenations are somewhat coarser, and the lateral primaries are less spreading."