64 CONTRIBUTIONS TO PAL^ONTOLOGY 



Genus MAGNOLIOPHYLLUM Conwentz 



MagnoliophyUum cordatum Dorf, n. sp. 



(Plate 9, Fig. 5; Plate 10, Fig. 1) 



This type of leaf is fairly abundant, although its large size has made it impossible to procure 

 complete specimens. The figured specimen is the most nearly complete of over 80 specimens 

 collected in the field. 



Description. — Leaves cordate to broadly ovate, symmetrical, with the base cordate to trun- 

 cate and the tip acute; length ranging from 10 to 18 cm., widtli from 8 to 16 cm., petiole stout and 

 up to 2.5 cm. long; midrib very stout; secondaries well defined, ten to twelve pairs mostly alternate, 

 leaving the midrib at angles varjdng from slightly more than 90° near the base, to 60° at the middle, 

 and to 50° or less near the tip; basal secondaries only slightly arched upward, upper secondaries 

 arching upward more abruptly, producing a greater distance between the secondaries near the 

 margins than at the midrib; one to three prominent tertiaries branching from lower sides of 

 secondaries forming conspicuous loops with superjacent tertiaries or secondaries close to the 

 margins; remaining tertiaries strong, percurrent, forming a coarse network in the intersecondary 

 spaces; margin mainly entire, occasionally undulate in the upper half of large leaves; texture firm. 



It seems strange that this well-defined type of leaf has apparently not been encountered 

 previously in the late Cretaceous deposits of North America. I believe, however, that it is closely 

 related to the specimens from the Raton formation which Knowlton referred to Magnolia cordifolia 

 Lesquereux.^ There are notable differences, however, chiefly in the character of the base, the 

 upper secondaries, and the number and prominence of the marginal loops, all of which are con- 

 sistently the same in Magnoliophyllum cordatum. 



I have not been able to determine the taxonomic affinities of this species, although its char- 

 acters are strongly suggestive of the family Magnoliacese. The smaller leaves of the living 

 Magnolia dealbata Zucc. of Mexico and the larger leaves of M. acuminata Linne of southeastern 

 United States ^ are of the same size and have almost identical venation and basal characters. I 

 have found no other modern leaves which are so nearly identical, so do not hesitate in referring 

 the species to Magnoliophyllum, implying relationship to the family Magnohacese. 



Occurrence — Corson Ranch, Wyoming, Locs. P. 371, P. 372; north of Walcott, Wyoming, 

 Loc. P. 373; Elk Mountain road, Wyoming, Loc. P. 374; Craig, Colorado, Loc. P. 375. 



Collection—V. C. Mus. Pal., Cotypes Nos. 1344, 1345. 



FAMILY LEGUMINOSiE 



Genus LEGUMINOSITES Bowerbank 



Leguminosites arachioides minor Berry 



(Plate 11, Figs. 2, 3, 5) 



Leguminosiles arachioides minor Berry, U. S. Geol. Surv. Prof. Paper 156, 89, pl. 14, figs. 2-6, 1930; Canada 



Geol. Surv. Mem. 182, 64, 1935. 

 Leguminosites? arachioides (Lesquereux) Lesquereux. Penhallow, Rept. Tert. Pl. Brit. Col., 61, fig. 14, 1908. 

 Nyssa (?) racemosa Kjiowlton, U. S. Geol. Surv. Bull. 152, 153, 1898; idem, Prof. Paper 134, 95, 1924. 

 Berrya racemosa Knowlton, U. S. Geol. Surv. Prof. Paper 155, 134, pl. 41, figs. 4-5, 1930. 

 Sabalites fructifer Lesquereux (in part), Rept. U. S. Geol. Surv. Terr., vol. 7, 114, pl. 11, figs. 3 (fruits at base 



of figure only), 3a, 1878. 



This type of seed is represented in the collections by a compound raceme and its counterpart 

 and several detached fruits. 



Berry described specimens from the Wilcox formation as the variety minor of the well-known 

 and widespread Legmninositesf arachioides (Lesquereux) Lesquereux, on the basis of their smaller 

 size. The Medicine Bow specimens appear to be slightly smaller still, though of the same size 

 exactly as several detached fruits from the Wilcox and Denver. In every other respect our speci- 

 mens are identical with the type and figured specimens from the Wilcox, the Raton, and the Denver 

 formations. The species is also recorded from the Animas, Dawson, and Black Buttes floras. 



' Knowlton, F. H., U. S. Geol. Surv. Prof. Paper 101, 315, pl. 86, pl. 89, fig. 1, 1917. 

 ' See sheet No. 13, Princeton University herbarium. 



