DESCRIPTION OP SPECIES— MORE^. 201 



• ten centimeters broad toward the base, where they are enlarged, rounded, 

 and siibcordate, contracted upward to a short, obtuse acumen. The lateral 

 veins, all thick, on the same angle of divergence, are nearly equidistant, the 

 basilar pair, much branched on the lower side, being not more distant from 

 tlie first pair of secondary veins than these are between themselves. The 

 areolation is irregularly quadrate or polygonal, formed by subdivisions in 

 right angle from deep nervilles, joined in the middle, rarely simple. From 

 the comparison of the characters of these leaves with those of the following 

 species, I have been induced to refer them to the same genus. Dombeyopsis 

 as a genus is still uncertainly limited. A number of the species described 

 under this name are now distributed in other genera, Grewiopsis, Greivia, and 

 Ficus, especially, as seen from the synonymy of F. tilice/olia, a form to which 

 our species is also related. 



Habitat. — Golden, Colorado; not frequent. 



Ficus plaiiicostiita, Lesqz. 



Plate XXXI, Figs. 1-8, 10, 11, 12. 



Ficus planicosiala, Lesqx., Annual Report, 1872, p. 393. — Schp., Pal. V6j;6t., iii, p. 594. 



Leaves of medium size, subcoriaceous, entire, elliptical or broadly oval, slightly acuminate or obtuse, 

 rounded to a short, thick petiole, palmately three-nerved from the top of the petiole, riirely from a short 

 distance above the base; primary and secondary nerves broad, flat, all eamptodrome, as well as their 

 divisions. 



The essential character of theae leaves, extremely abundant at Black 

 Buttes, found also at Golden and other localities, is the broad, flattened face of 

 the nerves. Their surface is not as coarse, their consistence not as thick as 

 in the former species, and all the leaves have the same graceful oval shape. 

 The basilar nerves are generally at a greater distance from the secondary 

 ones; the characters of the nervation and the areolation, however, being the 

 same. All the nerves are more or less branching, the primary ones from the 

 base to the point, the secondary ones only toward the borders, where all the 

 divisions abruptly curve quite near the margin, sometimes passing into the 

 edges. The leaves are of medium size. The largest which I have seen is 

 twelve centimeters long and seven centimeters broad in the middle. As seen 

 in figs. 2, 4, and 10, the top is sometimes abruptly contracted into a short 

 acumen; they are, however, more generally obtuse. Tiie species seems very 

 variable. I am, however, uncertain if the forms described here as varieties 

 do not represent separate species. Fig. 6 is a branch with unfolding leaves. 



Habitat. — Black Buttes, Wyoming, there very abundant; Golden, Col- 



