NO. 2151. FOSSIL PLANTS FROM FLORISSANT— KNOWLTON. 279 



RHUS? TRIFOLIOIDES Lesquerenx. 



Rhtis trifolioides Lesquereux, Rept. U. S. Geol. Surv. Terr., vol. 8 (Orel, and 

 Tert. Fl.), 1883, p. 196. 



Type.-^&t. No. 50,325, U.S.N.M. [Original No. 58 of Lacoe's 

 cabinet]. 



Leaf trifoliolate; leaflets sessile or nearly so, oval, elliptical-oval, or 

 slightly elliptical-obovate, the terminal one shghtly the larger, 

 abruptly narrowed to a very short petiolule; margin spinose-serrate 

 nearly to the base of the blade; midrib very strong and hard; second- 

 aries numerous, about a dozen pairs, very thin and delicate, at an 

 angle of about 45°, entering the spinose marginal teeth; finer 

 nervation obscure. 



This species had not been previously figured, but as the type came 

 to the United States National Museum through the Lacoe collection 

 this opportunity is embraced to figure it, and also to amphfy and 

 perfect the description. For instance, in the original characterization 

 the leaflets are said to be "apiculate and dentate to the middle," 

 but the present figure shows they are rather obtuse and are beset 

 with numerous sharp, spiny teeth which extend almost to the base. 

 The nervation is said to be obsolete, but as shown in the figure it 

 consists of a prominent flat midrib and numerous very thin seconda- 

 ries, most of which enter the teeth. 



The character of the teeth as well as the general appearance incline 

 one to the opinion that this form is not correctly placed in Rhus — at 

 least it is unhke any living form with which I am famihar— but in 

 absence of a more positive reference it is left as disposed by Les- 

 quereux. I have, however, ventured to question the generic 

 reference. 



COTINTJS FRATEENA Leeqnereux. 



Plate 24, fig. 1. 

 Cotinus fraterna (Lesquereux) Cockerell, Torreya, vol. 6, 1905, p. 12; Univ. 



Colorado Studies, vol. 3, 1906, p. 170. 

 Rhusfratenia Lesquereux. Rept. U. S. Geol. Surv. Terr., vol. 8 (Cret. and Tert. 



FL), 1883, p. 192, pi. 41, figs. 1, 2. 

 Andromeda rhomboidalis Lesquereux, Rept. U. S. Geol. Sui-v. Terr., vol. 8 (Cret. 



and Tert. Fl.), 1883, p. 176. 

 Type of "Andromeda rhomboidalis" Lesquereux.— Cat. No. 50,343, U.S.N.M. 



[Original No. 70 of Lacoe's cabinet.] 



The Scudder collection contams about a dozen finely preserved 

 examples of this species. 



Andromeda rJiomhoidalis Lesquereux was named and described, 

 but not figured, by Lesquereux in 1883, The type of this form came 

 to the possession of the United States National Museum through the 

 Lacoe collection. A comparison of this with the figures of EJius fra- 

 terna shows them to be the same, and Andromeda rhomboidalis is 

 consequently referred to this species. 



