Geological Survey Bulletin 204 Fossil Flora of the John Day Basin, Oregon

Family TILIACEÆ.

GREWIA CRENATA (Unger) Heer.

GREWIA CRENATA (Unger) Heer, FL. Tert. Helv., Vol. III, p. 42, Pl. CIX, figs. 12—21; Pl. CX, figs. 1—11, 1859; Ward, Types of the Laramie Flora, p. 85, Pl. XXXIX, fig. 1, 1887; Newberry, Later Extinct Floras, p. 120, Pl. XLVI, fig. 2; Pl. XLVII, figs. 2, 3, 1898 (1899).

Paliurus colombi Heer. Lesquereux, Proc. U. S. Nat. Mus., Vol. XI, p. 16, 1888.

Grewia crenata was first found in this area at Bridge Creek, and the specimens figured by Newberry, as well as a number of others since obtained, are before me. They not only agree among themselves but quite closely, indeed, with the figures of this species given by Heer. There can be no reasonable doubt as to their identity.

A number of specimens have been found in the Mascall beds at Van Horn's ranch and vicinity that must also be referred to Grewia crenata. The single example referred by Lesquereux to Paliurus colombi probably belongs here, although it is very much like certain forms of Populus Zaddachi from the Auriferous gravels of California. The leaves, three in number, from the Mascall beds are a little narrower than those from Bridge Creek, and are somewhat more deeply cordate or auriculate at base, but the differences are not sufficient to warrant separating them.

Locality.—Bridge Creek, Oregon. Collected by Rev. Thomas Condon (U. S. Nat. Mus., Nos. 7077, 7078, 7079) and Maj. Charles E. Bendire (U. S. Nat. Mus., No.9532). Mascall beds, Van Horn's ranch and vicinity. Collected by Major Bendire (U. S. Nat. Mus., No. 2542) and by Knowlton and Merriam July, 1901 (U. S. Nat. Mus., Nos. 8990, 8991).

GREWIA AURICULATA Lesq.

GREWIA AURICULATA Lesq., Cret. and Tert. Fl., p. 252, Pl. LV, fig. 1, 1883.

This species appears to rest on the single example figured as the type. None of the recent collections contain it, although there are a number of specimens of G. crenata.

The type of G. auriculata should be in the University of California, but it can not now be found. If it has been correctly figured it seems to be very different from the other leaves of Grewia found in the same beds, although it may be only an abnormal form of that species.

Locality.—Bridge Creek, Grant County, Oregon. Collected by Rev. Thomas Condon.