DESCRIPTION OF SPECIES— BtTTTNERIACE^. 255 



the primary aud secondary nerves thick, joined by strong, parallel, arched 

 nervilles, the lateral primary ones sparingly branching, the others mostly 

 .simple; they are broadly ovate, enlarged in the middle into two very short, 

 obtuse lobes, and deeply cordate at fhe base. The relation of the species is 

 marked with D. lobnta, Ung. (Gen. et Sp., p. 447), published by the same 

 author as Ficus Dombeyopsis (Sillog., i, p. 13, pi. v, figs, l-o), and referred 

 by Schimper to Sterculia. The European leaves are longer, more distinctly 

 lobate, and rather palmately five-nerved. 



Habitat. — Above Spring Canon, "near Fort Ellis, Montana ( PF?n. Savage). 



Dombeyopsis trivialis, Lesqz. 



Plate XL VII, Fig. 3. 



Dombeyopsis trivialis, Lesqx., Annual Report, 1872, p. 380 ; 1873, p. 404. 



Leaf comparatively small, deeply cordate, nearly square in outline, three- to five-lobed, obtuse; 

 nervation tripalmate, craspedodrome. 



The leaves of this species, smaller than those of the former, still differ by 

 the nervation, being much less deeply marked, all the nerves narrower, and 

 the secondary veins few, placed in the upper part of the leaves, at a great 

 distance from the base. Two lower veinlets, from the top of the petiole, show 

 this leaf as subpeltate and five-palmate. The lobes also, two on each side, 

 are more defined, though obtuse. The substance is not as thick. 



Habitat. — Golden, Colorado. 



Dombeyopsis obtnsa, Lesqz. ^ 



Plate XL VII, Figs. 4, 5. 

 Doviheyopsis obiusa, Lesqx., Annual Beport, 1872, p. 375. 



Leaves subcoriaceoua, very entire, round-oval, obtuse, cordate; nervation three-palmate. 



This species seems closely allied to D. platanoides, and may be a variety 

 of it. The primary veins are not quite as thick ; the secondary ones are 

 inequidistant, and mostly in the upper part of the leaves, which, as seen 

 from the direction of the lateral primary nerves, which curve inward and are 

 effaced before reaching the borders, are oval, entire, or without lobes. The 

 nervilles, as far as they can be seen (fig. 4), are close and straight. 



Habitat. — Golden, Colorado. 



Dombeyopsis g^ r a n d i f o 1 i a, Ung. 



Plate XLVII, Fig. 6. 



Dombeyopsis grandifolia, Ung., Gen. et Sp., p. 447 ; Foss. Fl. v. Sotzka, pi. xxvi, xxvii, fig. 1. — Goepp., 

 P.iljBont., ii, p. 278, pi. sxxvi, fig. 2ft.— Ett., Fl. v. Mont. Prom., p. 21.— Lesqx., Annual 

 Beport, 1873, p. 404. 



Leaf apparently of large size, deeply cordate or auricled at the base, palmately multinerved. 



All the leaves indicated by the above references to European authors 



