162 



LARAMIE FLORA OF THE DENVER BASIN. 



however, is a smaller leaf, is distinctly ovate- 

 lanceolate, and has numerous secondaries. The 

 form here described is of about the same size 

 and shape as Apocynophyllum wilcoxensis 

 Berry, 61 from the Raton formation of southern 

 Colorado, but differs in having fewer and more 

 curved secondaries. 



Occurrence: Laramie formation, Leyden 

 Gulch, 6 or 8 miles north of Golden, Colo., col- 

 lected by A. C. Peale, 1908. 



Order POLEMONIALES. 



Family BIGNONIACEAE. 



Dombeyopsis obtusa Lesquereux. 



Plate XIII, figure 4; Plate XX, figure 11; Plate XXVII, 

 figures 1-4. 



Dombeyopsis obtusa Lesquereux, U. S. Gepl. and Geog. 

 Survey Terr. Ann. Rept. for 1872, p. 375, 1873 ; idem 

 for 1873, p. 382, 1874; idem for 1876, p. 514, 1878; 

 Tertiary flora: U. S. Geol. Survey Terr. Rept., vol. 

 7, p. 255, pi. 47, figs. 4, 5, 1878. 



Leaves subcoriaceous, entire, round oval, obtuse, 

 cordate; nervation three-palmate.- — Lesquereux. . 



This species was first described from a 

 specimen found in Gehrung's coal bed, near 

 Colorado Springs, Colo., but the specimen does 

 not appear to belong to the United States 

 National Museum unless, to judge from the 

 description, it is the specimen figured as one 

 of the types, 82 which is recorded in the Museum 

 catalogue as coming from Golden, Colo. It is 

 probable, however, that the original is not now 

 preserved, for the specimen above mentioned 

 agrees in character with others known to be 

 from Golden. 



The two figured types are preserved in the; 

 United States National Museum (Nos. 380, 381) : 

 and if they are correctly labeled, both came 

 from the lower or true Laramie at Golden.: 

 The collection also contains another example 

 from the same locality. 



There is a single very fine example of this 

 species (No. 281d) from the upper or Denver 

 beds at Golden. It was only partly exposed, 

 but by removal of the matrix the whole of a 

 large and very perfect leaf was revealed. This 

 agrees in shape with Dombeyopsis obtusa and in 

 nervation rather more closely with Dombeyopsis 



a Berry, E. W., V. S. Geol. Survey Prof. Paper 91, p. 342, pi. 103, figs. 

 2, 3; pi. 108, flg. 4, 1916. Knowlton, F. H., TJ. S. Geol. Survey Prof. 

 Paper 101, p. 345, pi. 103, fig. 3; pi. 105, figs. 1, 2; pi. 106, fig. 1, 1918. 



« Lesquereux, Leo, op. eit. (Tertiary flora), pi. 47, fig. 4. 



platanoides, all of which goes to show that these 

 species are very closely allied. 



In the material from Coal Creek, Boulder 

 County, Colo., I find three specimens which 

 clearly belong to this species. All are more 

 nearly perfect than Lesquereux's types, and 

 two, shown in Plate XXVII, figures 1, 2, are 

 preserved nearly entire. The smaller of these 

 two specimens lacks only a small portion of 

 the base, and the larger a portion of the side and 

 apex. In figure — the two lateral thick ribs 

 are parallel with the midrib for at least tWo- 

 thirds of the upper portion, as in Lesquereux's 

 figure 5. The other specimen figured has the 

 base as in his figure 5, while the ribs are slightly 

 more divergent than in his figure 4. The un- 

 figured example is almost the exact counterpart 

 of Lesquereux's figure 4, thus connecting them 

 all with his species. 



As stated above,- the type of Dombeyopsis ob- 

 tusa appears to have come from the true 

 Laramie near Colorado Springs, Colo., and the 

 finding of these specimens is a satisfactory 

 confirmation of the horizon of which they are 

 characteristic. 



The collections made by Lakes at the Doug- 

 las coal mine, Sedalia, Colo., embrace three 

 or four rather fragmentary specimens that, 

 appear to belong also to this species. They 

 represent only basal portions of the leaves, for 

 it seems to be the unfortunate circumstance 

 that leaves of this type are as a rule poorly pre- 

 served. So far as I am able to determine there 

 is no distinction to be drawn between them and 

 the types of Dombeyopsis obtusa, and they are 

 so referred. 



In figures 3 and 4 of Plate XXVII are shown 

 specimens from Marshall's coal mine, near 

 Golden, Colo., that appear indistinguishable 

 from the leaves from Coal Creek shown in 

 figures 1 and 2, the only difference being the 

 further splitting of the petiole, or rather the 

 origin of the three ribs at a lower point than in 

 the other. As a result of this lower origin of 

 the ribs the basal portion of the lamina is 

 slightly more decurrent, but otherwise in shape 

 and nervation these leaves are certainly iden- 

 tical. 



Several fragmentary examples, which are in- 

 distinguishable from Lesquereux's figured types 

 are present in the small collection from Crow 

 Creek, Colo. 



