DESCRIPTION OF SPECIES— imAMN'E.E. 275 



ZIZYPHUS, Mill. 

 Z i 7, }' p li II s a I s I o r t u s , Lesqz. 



I'late LI, Figs. 7-'.). 



Zhijphiia distortus, Lcsqx., Aunu.al Report, 1873, p. 401. 



Leaves mciubr.inaceous, very entire, rounded or truncate to tlio petiole, paliiiatcly fivc-nervcd 

 from the base; midrib thick; lower lateral veins simple, following the borders, the inner ones stronger, 

 branching, curving iuward and ascending higher up toward the point; nervation cauiptodrome. 



The leaves vary in size from four io seven centimeters broad, and some- 

 what longer, the upper jiart being broken in all the specimens obtained. 

 The nervation is tliat of the leaves of this genus, represented with Ijorders 

 entire, like Z. protoleus, Ileer, etc.; though, in most of the fu.ssil species de- 

 scribed, it is generally simply three-palmate. The shape of the leaves slightly 

 inequilateral, and the nervilles very close, numerous, and simple, at right 

 an<de to the nerves, are characters which relate them to Zizyphits. 



Habitat. — Golden, Colorado; rarely found, and always in fragments. 



Z i 7. }- p li IB s M e c k i i , Lesqx. 



Plate LI, Figs. 10-14. 



Zizyplius Miekii, Lesqs., Annual Report, 1872, pp. 388, 389. 



Leaves snbcoriareous, ovoid, obtusely acuminate or pointed, rounded to the petiole, obtusely cre- 

 nate, three- or live-nerved from the base. 



The leaves differ little in their size and their characters. They average 

 five centimeters in length and three in width; the borders are crenate or 

 crenulate from quite near the base to near the obtuse point, which, cither 

 rounded or acuminate, is generally entire; the lateral outside primary nerves, 

 not always present, curve along tlie borders, and ailastomose below the middle 

 of the leaves with branches of the internal ones; these ascend higher to the 

 point or to near the point of the leaves, are more or less branched like the 

 marginal ones, forming with their branches a simple series of bows connected 

 to the teeth by straight, oblique nervilles, as seen in figs. 11 and 12. The 

 fibrillar, rarely discernible, are at right angle to the midrib, somewhat oblique 

 to the lateral nerves, and close, mostly simple. This species is allied to Z. 

 ovatus, Web. (Pala?.ont., ii, p. 203, pi. xxii, fig. 12; x.xiii, fig. 1), whose leaves, 

 however, have the lateral nerves simple and more distinctly acrodcome. It 

 has a more marked relation to the following species, of which it looks like a 

 dimiuutive form, and is comparable also by the shape of the leaves to Greicia 

 crenata of llecr. 



