Rhus. TEREBINTHINEjE. 31 



Rhus myriceefolia, up. nov. 

 PL I. Figs. 5-8. 



Leaves large pinnate ; leaflets oblong, lanceolate-pointed or acuminate, short-petioled ; 

 borders undulate and denticulati ; nervation mixed. 



The consistence of the leatlets is hard, apparently coriaceous, the sur- 

 face undulate and smooth; their size is comparatively large, from eight 

 to thirteen and a half centimeters long, and one and a half to two and 

 a half centimeters broad. The form, cuneate to the base, is ovate lanceo- 

 late acute or oblongdanceolate, gradually passing up to a prolonged 

 acumen. As seen in the comparison of Figs. 5 and G, the borders 

 are more or less distinctly dentate, according to the size of the leaves ; 

 the dentations, however, being irregular in all ; they are also undulate 

 like the surface. The secondary nerves, as marked in Figs. 6 and 7, 

 are at a right angle of divergence near the base, gradually becoming 

 more oblique upwards, all curved in passing to the borders, where they 

 either enter the teeth or curve in passing under them, as in the former 

 species. By their shape, their consistence and nervation, these leaves are 

 similar to those of Mt/ncct, to which they should have been referred but 

 for the fragment (Fig. 5) which shows distinctly part of a compound leaf. 

 We do not have in our flora any species of Rhus of the same characters 

 as those of this species. It, however, belongs to the section of the Rhus 

 with smooth or naked pctioled pinnate leaves and serrate leatlets, like 

 R. viridiflora, Poir., R. glabra, Linn., especially represented at our time in 

 the North American flora. Fig. 8 is apparently a small crushed cone, 

 or a seed surrounded by an involucre. Its reference is not ascertained. 



Habitat. — Chalk Bluffs, Nevada County, California. Voy's Collection. 



Rhus metopioides, «i>. nov. 



PL VIII. Figs. 12, 13. 



Tieaves /'innate; leaflets coriaceous, very entire, unequilateral, broadly ovate, abruptly 

 pointed, rounded /<> a short petiole; secondary nerves in right an git to the midrib, 

 subcamptodrome, separated by tertiary thinner veins anastomosing by veinlets at 

 various angles to the secondary on<*. 



This form bears to the present Rhus metopiitm, Linn., of Cuba (found 

 also in cultivation at Key West and South Florida), the same degree of 



