296 BULLETIN UNITED STATES GEOLOGICAL SUEVEY. [VolYI. 



des Plantes, and still others in letters. From these sources and from 

 memoranda communicated by him based on the plates of the Florissant 

 species prepared for the eighth volume of Hayden's Eeport, the follow- 

 ing review is drawn : 



Among the exogenous i^lants the following polypetalous families are 

 represented : 



Some flowers with long stamens are referred doubtfully to the genus 

 Bombax, one of the Malvaceae. Of Tiliaceae, a species of Tilia has 

 been found ; of Eutaceae, one species of Ailanthus. Of Anacardiaceae, 

 three species of Ehus are described under the names Uvand, rosae- 

 folia, and Haydeni, and three or four others mentioned. Of Juglandeae 

 one species, and one of Zanthoxyleae. Of Ehamnaceae, Faliurus Floris- 

 santi is the only species. A few leaves of Celastrus represent the Celas- 

 traceae. The Sapindaceae are very abundant, three genera occurring; 

 leaves of Staphylea acuminata^ numerous specimens of Sapindus stellar- 

 iaefolius and S. angustifolms, as well as of two or three other species 

 of the same genus, and two species of Acer, represented by flowers, 

 leaves, and fruit. The flora has a large number of Leguminosae, of the 

 genera Eobinia, Colutea, and Cassia, besides Acacia septentrionalis and 

 Mimosites linear if olius, described in the report mentioned. The Eosa- 

 ceae show a Prunus, leaves of Eosa, and species of Spiraea, with very 

 finely preserved leaves of an Amelanchier, scarcely distinguishable from 

 some of the varieties of the living species. Liqiiidamhar eurojjaeum Al. 

 Br. represents the Hamameliclae; numerous leaves of Weinmannia, the 

 Corniculeae; and, finally, there is a single species of Araliaceae, closely 

 allied to Aralia multifida Sap. Excepting the Liquidambar none of the 

 Polypetalae have been shown to be identical with European forms. 



Among the monopetalous plants the Ericaceae are represented by 

 Vaccinium reticulatum Al. Br., together with one or two species of Andro- 

 meda. Two species of Ilex, one described as J. suhdenticulata^ represent 

 the Aquifoliaceae ; one of Diospyros, the Ebenaceae ; a species of Catali^a, 

 the Bignonaceae. Oleaceae have a flowering branch of Olea and four 

 species of Fraxinus, one referred to Heer's F. praedicta and another de- 

 scribed as new under the name of F. Brownelli. 



The apetalous angiosperms show a great variety of forms at Floris- 

 sant, and among them many are referred to species from foreign tertia- 

 ries. Urticacea are the most numerous of all plants ; three species of 

 Ulmus occur, U. tenuinervis Lesq., peculiar to Florissant, U. Braunii 

 Heer and U. Fischeri Heer, both from the European tertiaries ; of Celtis 

 there are leaves having a close affinity to the existing C. occidentalis 

 and its variety integrifoUa Nutt. ; they may, however, represent two 

 species ; a single species of Ficus represents a Euroi^ean form, F. Ian- 

 ceolata Heer ; but the mass of specimens — nearly or quite one-half of 

 all that have been brought from this locality — represent species of Pla- 

 nera ; Lesquereux states that he has at least two thousand specimens 

 of " leaves of Platiera longifolia [Lesq.] and of its varieties, which come 



