176 DESCRIPTION OF SPECIES. 



Aiul roiiKMla rlioiiiboidalis, sp. nov. 



Leaves rhoinboidal in outline, enlarged in tbe middle, narrowed,dowuward to a 

 long slender petiole and equally so npwaixl to an obtuse apex; nervation obsolete. 



The leaves without the petiole are 3 centimeters long, 18 millimeters 

 broad in the middle; the very slender flexuous petiole is broken 1* centi- 

 meters from the base of the leaf. 



Species comparable to A. fremula, Heer, "Fl. Tert. Helv.," p. 9, pi. ci,^ 

 fig. 25. The leaves are, however, more enlarged in the middle. 



Hah. — Florissant. Lacoe's Cabinet, No. 70. 



VACCINIUM, Linn. 

 Vaociiiitiiii reticulatum?, Al. Br. 



"U. S. Geol. Rep.," vii, p. 235, pi. lix, fig. 6. 



ARALIACE.^. 



ARALIA, Toum. 

 " U. S. Geol. Rep.," vii, p. 235. 



Aralia clissecta, sp. nov. 

 Plate XXXV. 



Leaves pabnately seven-lobed ; primary segments cut to tbree-fourths of the 

 lamina, oblong-lanceolate, deeply lobate, dentate above ; secondary divisions lance- 

 olate, obtu.sely dentatelobed ; sinuses obtuse; secondary nerves subopposite, tbick,^ 

 pinnately branching ; nervation craspedodrome. 



Of the seven lobes of this fine leaf three are preserved nearly entire 

 and sufficiently represent its character. The leaf, nearly round or fan- 

 shaped in outline, 19 centimeters long from the top of a very thick petiole 

 to the apex of the medial lobe, is cut into seven primary divisions, all 

 pinnately or bipinnately lobate - dentate ; the lobes and teeth oblique^ 

 slightly turned up, each entered by one of the secondary or of the tertiary 

 nerves, all the nei^ves therefore corresponding to one division of the leaves 

 and united by nervilles at right angles. There are no intermediate veins 

 passing up to the base of the lobes as in the large fragments which I have 

 referred to Myrica as M. insignis and M. Lessif/ii of vol. vii, which have 

 apparently a kind of primary division like this leaf. 



This fine species is closely related to Aralia midtijida, Sap., " Et.," i, 

 1, p. 115, pi. xii, fig. 1, from which it differs merely by the primary divisions 

 being regularly pinnately lobed, the lobes also pinnately lobed or deeply 



