FOSSIL FLORA. 741 



VITACEiE. 



CiSSUS HAGUEI n. 8p. 



PI. CL ti.n- 2. 



Leaf membranaceous, (]uadraiignlar-()\ate, truncnte or possibly slightly 

 heart-shaped at base and acuminate at apex, lateral lobes short, obtuse; 

 mai-gin toothed, the teeth low, obtuse or somewhat acute; nervation 

 palmate, midrib thin, i)erfectly straight, lateral ribs of same strength as 

 midril), arising at an antj-le of 45°, i)assini>- directly to and terminatino- 

 in the obtuse lateral lobes: ribs with 4 or ."") branches on the outside, 

 which terminate in marg-inal teeth; secondaries about 4 })airs, alternate, 

 at same ang-le as the ribs and terminating in the teeth; nervilles thin, 

 sparse, percnrrent or often broken. 



This fine leaf is 8..'') cm. long, 5.2 cm. Ijroad Ijetween the lobes and 6.5 

 cm. broad in the widest })art, Avliich is only a short distance above the base. 

 In outline it is what may l)e called quadrangular-ovate — that is, between 

 ovate and square. It is palmateh' S-riblied, the lateral ribs being at an 

 angle of alxuit 45° and of the same strength as the midrib. They ])as.s 

 straight to and terminate in the short lateral lobes, and have 4 or 5 out- 

 side branches which also terminate in tlie marginal teeth. 



The relation of this species is undoubtedly with Cissus pdrroticpfolm 

 Lx.,' from the (xreen River group. This Litter species difters in being 

 relatively longer, ^^'ithout especially marked lateral lobes, with larger-, more 

 obtu.se teeth, and unforked outer branches of the lateral ribs. There are 

 also more secondaries in the upper part of the leaf These, however, are 

 but slight difi'erences, and are possibly only such as might be expected in 

 individual variation. But as only one example has ))een found in the 

 Yellowstone National Park, there is no means (if knowing what maybe 

 allowed for individual variation, so I have preferred to keep them sejiarate. 



I take ideasure in namino- this species in honor of I\Ir. Ai-nold Ha<>'ue, 

 who collected it. 



Habitat: Fossil Forest Ridge, middle stratum; collected by Arnold 

 Hague, September 24, 1884. 



'Tert. Fl., ji. 239, PI. XLII, fig. 1. 



