24 THE LATER EXTINCT FLORAS OF NORTH AMERICA. 



Formation and locality: Tertiary (Eocene?). Yellowstone River, Mon- 

 tana and northern Montana. (Excluding PI. LV, fig. 5, in part,.) 



Glyptostrobus Europ^us (Brong.) Heer. 

 PL XXVI, figs. 6-Sa; LV, figs. 3, 4. 1 



Fl. Tert. Helv., Vol. I (1855), p. 51, PI. XIX; XX, fig. 1. 

 Taxodium Europceum Brong. Ann. Sei. Nat., Vol. XXX (1833), p. 168. ■ 

 " Glyptostrobus Europce,us (Brong.) ." Newberry, Ann. N. Y. Lye. Nat. Hist., Vol. 

 IX (April, 1868), p. 43; Ills. Cret. and Tert. PI. (1878), PI. XI, figs. 6-8a. 



"Branches slender, bearing many branchlets; leaves of two forms, one 

 short, thick, and appressed, the other longer (one-half inch), slender, diverg- 

 ent, acute, the shorter form carinated, the longer less distinctly, if ever so; 

 male catkins small, terminal, globular, composed of a few shield-shaped 

 scales; fertile cones larger, ovoid in form, scales narrow, wedge-shaped at 

 base, at summit expanded, semicircular, with waved or crenate margins, 

 the dorsum of each more or less distinctly marked with 10 to 12 acute, 

 radiating carinse." 



One of the most interesting plants of the European Tertiary is the 

 Glyptostrobus, first discovered by Brongniart, and subsequently fully illus- 

 trated in the magnificent work of Prof. O. Heer, Flora Tertiaria Helvetia?, 

 1 Vol. I, p. 52, PI. XVIII; XXI, fig. 1 ; Vol. Ill, p. 159. The genus is now 

 only represented on the earth's surface by G. heterophyllus and G. pendulus 

 of China, but during the middle Tertiary epoch was widely spread over 

 both hemispheres. Most of the exposures of our older Tertiary strata have 

 furnished specimens of some one of the various phases of what is regarded 

 by Professor Heer as a single species, but which has been described under 

 the three names of G. Europceus, G. Ungeri, and G. Oeningensis 



What are probably but varieties of this same plant were collected by 

 the United States Exploring Expedition under Captain Wilkes, at Birch 

 Bay, Washington, by George Gibbs, esq., geologist to the Northwestern 

 Boundary Commission (see Boston Journ. Nat. Hist., Vol. VII, No 4 (1863), 

 p. 517), and are represented by numerous specimens in the collection of 

 fossil plants made by Dr. Hayden on the Yellowstone and Upper Missouri. 



: Dr. Newberry's only manuscript for PI. LV, figs. 3. 4, is a pencil memorandum referring 

 them to "-Glyptostrobus Ungeri Heer.'' — A. H. 



