126 DESCRIPTION OF SPECIES. 



It ha in n us «le for in at us, sp. nov. 



Plate XX, Fig. 6. 



Leaf lanceolate, tapering to an obtuse point, abruptly narrowing and decurrent 

 to the petiole; borders entire, irregularly undulate; lateral nerves simple, campto- 

 drome. 



The leaf seems to have been deformed in the process of maceration. 

 It is largest below the middle, diversely undulate-plicate on both sides; 

 the secondary nerves are numerous (16 pairs), open, but much curved in 

 passing toward the borders and following close to them, the upper ones 

 at a more acute angle of divergence than those of the base. 



Hal. — Golden, Colorado. Specimen in the National Museum. 



