54 THE FLORA OF THE DAKOTA GROUP. 



Although strong, the up])er secondaries curve before reaching the 

 borders and enter them either by their ends or by subdivisions of their 

 branches. 



The species is distantly related to Qncrcus (Dn/diihi/IIniii) suhoyidroiiii 

 (Sap.) Lesq./ which has, however, the leaves narrow, dentate .or crentite 

 and the nervation cainptodrome. 



Habitat: Ellsworth County, Kansas. No. 4204 of the collection of 

 Mr. R. 1). Lacoe. 



QUEBCTJS ALNOIDES, 8p. nOV. 



PI. VII, Fig. 3. 



Leaf coriaceous, obovate (broken at apex), entire or slightly flexuous 

 along the borders, cuneate at liase ; secondaries inequidistant, more ajjproxi- 

 mate towards the base, thick, mostly simple, camptodrome, the basilar pair 

 marginal and very thin ; uervilles distinct, at right angles to the secondaries, 

 percurrent, simple or forking, and anastomosing in the middle. 



Though the specimen represents only the lower part of a leaf, the 

 characters noted aljo^'e are clearly marked. The fragment indicates a leaf 

 gem ^^j 'jcm ipj^g ;^^^(| 4.5°™ broad at or near the middle. The secondaries have 

 an angle of divergence of about 50°, some of them close together, others 

 1'^'" apart, separated by an intermediate tertiary, much thinner and shorter 

 than the secondaries, and flexuous. 



S})ecies com\){irah\e to Air/ itcs j)SCM(Uncana Gopp.,^a leaf which, however, 

 has the borders obscurely dentate. It is still more closely related to Quercus 

 Deloesi Heer.' A point of comparison is found also in Q. advena Sap.,* a 

 Tertiary species. 



The reference of this leaf to Quercus has been questioned, biit none 

 other proposed. Considering the form of the leaf and its nervation the 

 relation seems clearly marked with the living Q. Champion i Benth., an 

 exam})le of which is figured by Schenk, Handbuch der Pala?ont., ii Abth., 

 5 Lief, p. 436, Figs. 4, 5. 



Habitat: Kansas. No. 429 of the Museum of Comparative Zoology 

 of Cambridge, Massachusetts. 



' FI. Fo88. SiStianne, PI. v, Figs. 1-3. 



''Tertiarfl. Scblesiens, Palaeontogr., vol. 2, 1852, p. 272, PI. i. Figs. 5a, b. 



^Fl. Tert. Holv., vol. 2, \>. liG, PI. Lxxviii, Figs. 6, 7, 14. 



'Auu. Sci. Nat., Bot., 5""- a6i:, vol. H, 18G7, p. 67, PI. v. Fig. G. 



