DESCRIPTION OF SPECIES. 73 



The flower heads are small, deeply embedded in the stone, the diame- 

 ter of those exposed at the surface being- only 6°"" to 7°"", the raj^s short, 

 the nucleus 3""" to 4"'"\ 



Haliitat: From ten miles northeast of Delpluis, Kansas. Locally 

 found in abundance. The liest specimens are Nos. 4001 and 4002 of the 

 collection of Mr. R. D. Lacoe. 



Plat ANUS prim^va Lesq, var. grandidentata. 

 PI. IX, Figs. 1, 2. 



Leaves coriaceous, palmately trilobate, broadly cuneate and entire at 

 base, deeply, sharply dentate on the boi'der; nervation tritid; lateral pri- 

 maries supral)asilar, ])aralk'l to the secondaries, branching; secondaries rigid, 

 mostly simple, passing straight to the point of the teeth. 



The leaf (Fig-. 1), like those of the following variety, is of medium size. 

 The lateral lolies are prolonged outside at the same degree of divergence as 

 the secondaries, 35° to 40°, and are lanceolate, acuminate, sharply dentate 

 on l)oth sides. Tlie nervilles at riglit angles to the nerves are strong, flexuous, 

 jjarallel, entire or forking, platanoidal in their divisions. 



Habitat: Ellsworth County, Kansas. Nos. 744 and 8Gi) of the collec- 

 tion of tlie nniseura of the University of Kansas. Collected by E. P. West. 



Platanus prim^va Lesq. var. subintegrifolia, 

 PI. IX, Figs. 3, 4. 



Leaves coriaceous, round, oval or oblong, obtuse, short petioled, den- 

 tate all around except at tlie subcordate base; primary nerve thick; secon- 

 daries ol)lique, parallel, ramose; nervilles very strong; areolati(in of I'lutaiiiis 

 pr'mucva. 



The leaves of this variety are not lobate but merely dentate all around, 

 except at the base; the teeth are short, turned outside, and are entered by 

 the ends of the secondaries and of their divisions and separated by flat or 

 shallow sinuses. The secondaries are much brancheil outside, the tertiary 

 divisions generally forking again near the border. The leaf (Fig. 4) is 

 smaller, oblong, apijarently obtuse, the apex being- destroyed. The secon- 

 daries are less ramose, the lowest pair only lieing divided on the lower side 

 in paralled curved tertiaries, the others merely forking near the borders. 

 The characters of these two leaves, though their size and form ditter, are 

 the same. 



