294 UNITED STATES GEOLOGICAL SURVEY— TERTIARY FLORA. 



tributed in tlic flora of South America and of New Zealand, would be an 

 anomaly in that of the upper group of the Lignilic. 



Haiutat. — West of Florissant, near South Park, Colorado, with Ilex 

 suhdenticulaliu Mijrica acuminata^ Sequoia Lang^doiffii, Sapindus anguslifolius, 

 etc. {Dr. A. C. Peak). 



Rhus H a y d « II i i , Lesqz. 



Plate LVIII, Fig. 12. 



lllius Ilajdcilii, Losqx., Annual Report, 1873, p. 417. 



LeavL'spiuu.itely ilividetl into alternate, linear, or narrowly lanceolate, acute leafletH,entireor undu- 

 late, oblique, and slightly decuriing to a broadly alate lachis; nervation pinnate, caniptodrome. 



The fragment, about tive centimeters long, representing the upper part 

 of a compound leaf, has a winged rachis, three millimeters wide on each side 

 of the narrow midrib, with three pairs of alternate leaflets, four to six milli- 

 meters broad, two and a half centimeters long, narrowly oblong-lanceolate, 

 obtusely pointed, nearly at right angle to the main rachis, to which they are 

 united in a sinus acute in the u])per side, and passing downward in a curve 

 to the borders which descend parallel to the midrib. The caniptodrome 

 nervation is of the same type as that of B. copaHina, Linn. The alar tissue 

 of the rachis is also marked in this living species by parallel caniptodrome 

 veinlets forking near the point, as in the fos.sil species. 



Habitat. — Middle Park, Colorado {Dr. F. V. Hayden). 



ZANTHOXYLEiE. 



ZANTHOXYLON, Linn. 

 Z a II t Ii o X y I o II j u g I a C9 <I i u u in ! , Al. Br. 



Plate LVIII, Fig. 10. 



ZanthoxyJon juf/landiimm, Al. Br., Stizenb. Verz., p. 87. — Heer, Fl. Tert. Helv., iii, p. 86, pi. csxvii, figs. 

 25-25, and eliv, lig. 36. 



Leaflet broadly oval, distantly crenate; nervation camptodrome. 



This fragment is too incomjilete for satisfactory identification. The 

 broadly oval form of the small leaflet and the character of the nervation 

 relate it to the European Miocene species quoted above. The curves of 

 the lateral nerves, however, are nearer to the borders, and the nervilles 

 are more distinct and less divided in our fragment. 



Habitat. — Washakie group, Wyoming {Dr. F. V. Hayden). 



AILANTHUS, Desf. 



I have not seen any fragments representing this genus in the specimens 

 from the Kocky Mountain Ligiiitic. Those, however, sent from Oregon have 

 a quantity of winged seeds retcral>!u to some of its s))ecics. 



