KNowi.Tr.N.] DESCRIPTION OF SPECIES. 67 



iiltinuitel}' seven-lobed; lateral lobes of same size, separated from cen- 

 tral lobe by sharp, deep sinuses, rather obtuse at apex, each with a 

 single, small, obtuse lateral lolie; central lobe much the larger, lance- 

 olate, three-lobed at apex, secondary" lobes short acute; margin of 

 lobes undulate or ol)scurely dentate; the three riljs of about the same 

 size, the central or midril) with about six pairs of alternate, thin sec- 

 ondaries, two of which enter the lateral lobes; lateral ribs with several 

 pairs of thin, irregular secondaries, two of which are slightly larger 

 and enter the side lobes; finer nervation producing a regular, deeply 

 impressed network. 



The leaf ligured, the only one found, is 3 cm. long and about 2 cm. 

 wide. It is seven-lo})ed, l)ut only three-ribbed, the lower lobes each 

 have a small side lobe, and the main central lol)e a small lobe on each 

 side. The length of the lower lobes from the sinus is about 1 cm, 

 that of the middle lobe from the sinus is 1.75 cm. The configuration 

 of the margin and the nervation are well shown in the figure. 



This species appears to find its closest affinity with Crafxgus fl,aves- 

 cens Newb. ,'■ or Myrlcti diversifolia^ as it was later called by Lesque- 

 reux.'* The leaf from Bridge Creek, referred by Lesquereux to his 

 Mijrlca dlverxifoJia, is certainly the same as Newberry's Cnif&'.guxfiaves- 

 cenn, and certain of the Florissant leaves appear to be the same, -but 

 1 am under the impression that at least two species are represented in 

 the latter material. 



Tlie leaf under consideration differs in a number of particulars from 

 the Bridge Creek specimens. Thus it is deeply three-lo))ed with each 

 lateral lobe provided with a small lobe, whereas the Bridge Creek speci- 

 mens are usually rathtu- evenly lobed throughout. The ribs in the 

 new form are three in mimber and arise at the top of the petiole. In 

 the other species the leaf is not palmateh" ribbed, but is provided with 

 secondaries, even the lowest pair of which arise from the midrib well 

 above the base and pass to the lobes. The margin of these latter spec- 

 imens inclines to be more creniilate. One specimen is perhaps closer 

 in shape to one of the Florissant leaves,'' but it differs in the nervation 

 in the same manner as do the other examples. 



Londlty. — White hill half-mile east of original Van Horn's ranch 

 locality. Collected by Knowlton and Merriam, July, 1901 (U. S. 

 Nat. Mus., No. 8513.)" 



Prunus!' Merriami n. sp. 



PI. XI, figy. 2, 3, 6, 7. 

 I'runu.-^ 11. sp., KiKiwltoii in Merriam, Univ. Cal., Bull. Dept. (TeoL, Vol. II, No. 9, 

 p. 309, 1901. 



Leaves coriaceous, ovate in shape, apparently abruptly rounded and 

 truncate at base, obtusely acuminate at apex; margin finely serrate, 



aLater Extinct Floras, p. 112, I'l. XLVIII, tig. 1. 



6Cret. and Tert. Fl., p. 241, PI. L, flg. 10. Thi.s species was also described and figured from 

 Florissant, Colorado, idem, p. 148, PI. XXV, figs. 6-15. 

 c- Idem, PI. XX V, fig. 11. 



