ö6 



Art. 8. — A. Kryshtofovich : 



lateral nerves, a strong 

 branch goes off from 

 a very short distance 

 above the origin of 

 the nerve. Lateral 

 basal nerves starting 

 from the midrib under 

 an angle of about 30°, 

 but running afterwards 

 more outward, under 

 an angle of about 45°. 

 These lateral nerves 

 run in the lobes nearer 

 to their internal edge ; 

 the chief external se- 

 condary veins, produ- 

 ced by basal nerves, 

 run nearly at a right angle to the midrib. The secondaries of the 

 median lobe proceed strictly upward, forming a camptodrome 

 network near the margin. Petiole long, reaching the whole length 

 of the limb. 



The genus Aralia^^ is chiefly Cretaceous, though some of the 

 species still survive now in tropical and subtropical countries. On 

 account of polymorphy of leaves, Aralla is very often confused 

 ^with Sassafras and Clssites, both being also mainly Cretaceous. 

 The present species, A. Polevoii, is most closely allied to the fol- 

 lowing species in the Potomac (Patapsco) Flora: Araliœphyllum 

 magni folium Font.,'^ A. acer oleics Font.,'^ Aceriplujllum aralioides 



Fig. 12. 

 Aralia Polevoii n. sp. 



1) Beeby (1903 b), p. 421. 



2) Fontaine (1889), p. 318, pi. CLIX, f. 9, 10; Berby (1911 c) p. 491, pi. XCVI, f. 1-5. 



3) FoNTATOE (1889), p. 319, pi. XCVI, f. 11 ; CLXH, £. 2. 



