KN0WI.TON.] DESCRIPTION OK SPECIP:S. 39 



One of lli(\sc \v:is li^urcd by Newljcrry in liis Latci- Extiiu-t Floras 

 (PI. XLVIII, tio;. 4) and the original is preserved in the United States 

 National Musouni (No. TOTO), l)ut no mention is made of the fact in 

 the body of that work, although this information is given on the l)ack 

 of the specimen itself. 



The other example was detected among the recent collections made 

 by the University of California and is in its museum. Both of these 

 specimens agree perfectly with the figures of this species given by 

 Heer in his Floi'a Fossilis Alaskana (PI. IV). There can be no ques- 

 tion of their identity. 



Loadlty. — Bridge Creek, Oregon. Collected by Rev. Thomas Con- 

 don (U. S. Nat. Mus., No. 7<»T(5)and by V. V. Osmont (Mus. Univ. Cal., 

 No. 2504). 



Betiila nhyrEROMORPiiA n. sp. 



PI. Ill, ligs. 6, 7; PI. V, lifT. 1. 



Populuft pofymorpha Newb., in part, Proc. U. S. Nat. Mus., Vol. V, p. 506, 1S83; 

 Later Extinct Floras, p. 50, PI. XLVl, fig, 3; PI. XLVII, ligs. 4, <S; PI. XLIX, 



fig. 4, 1898 (not other figures). 



Leaves of firm or subcoriaceous texture, ovate, elliptical, or very 

 slightly elliptical-obovate in general outline, from very obtusel}^ wedge- 

 shaped to truncate or o])scurely heart-shaped, and often unequal- 

 sided bas(\ obtusely acuminate at apex; petiole usually strong, 

 one-half or less the length of the Ijlade; margin usuall}^ coarsely and 

 unequally dentate or sometimes doubly dentate, the teeth mainl}- 

 obtuse, occasionally acute; midrib rather thick, especially in the lower 

 part of the ])lade; secondaries 7 to U pairs, usually strong, the two or 

 three lower pairs close together and at a lower angle than the others; 

 upper ones at an angle of about 4.5'^, often spreading and slightly 

 curved downward, all craspedodrome and ending in the large teeth, 

 and often with several branches on the lower side which pass to 

 smaller teeth; nervilles numerous and strong, both percurrent and 

 l)roken, approximately at right angles to the secondaries; finer nerva- 

 tion producing an irregular areolation. 



This form is the most abundant one in the collections and is repre- 

 sented l^y hundreds of examples. They are in general small leaves, 

 ranging in length from 4.5 to 7 cm., and average length being al)out 

 5 cm. In width they range from 2.5 to 5 cm., the average being per- 

 haps a little more than 8 cm. Only occasionally is one noted that is a 

 little smaller than the above dimensions (cf. Newberry, Later Extinct 

 F'loras, PI. XLIX, tig. 4). The variation in shape, margin, etc., is 

 well shown in the figures quoted and in the examples here figured. 



It is with much hesitation that I venture to found this species; not, 

 indeed, from lack of sufficient material, but rather from embarrass- 

 ment of I'iches. Lesquereux, through whose hands nuich of this 

 matei'ial has jwssed. would separate them not only into many species 



