ropulus. AMENTACE^E. H 



The only leaf seen of this species is four and a half centimeters long, 

 two and a half centimeters broad in the middle, exactly elliptical-oval, 

 with borders minutely but distinctly crenato-serrulate. The divergence 

 of the lateral veins is about 60° in joining the deep narrow midrib ; but 

 they soon curve toward the borders in simple festoons, narrowing the 

 angle of divergence from the middle upwards. These lateral veins are 

 close, twelve pairs, parallel, thin, but deeply and distinctly marked like 

 the nervilles which unite them in right angle, and also the short inter- 

 mediate tertiary veins. This leaf has distinctly the characters of the sec- 

 tion Cinerascentes or Caprew, of the living Willows, and is closely related 

 to S. caproeoides, Anders., of the California flora. 



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



POPULUS, Linn. 

 Populus Zaddachi, Heer. 



PI. VIII. Figs. 1 - 8. 



Leaves very variable in size, ovate, more or less aactcly and gradually 'pointed, round or 

 cordate at the base ; borders crenate ; nervation five to seven palmate, generally from 

 the top of it long slender petioU ; lower lateral nerves at mi open anglt of divergence; 

 the inner ones mon acutely oblique, mid ascending to near tin upp( r part <>f tin 

 leaves, sometimes to near th< point. 



r„pu!u* Zaddachi, Heer, Flor. Fuss. Ant., I., p. 98, PI. VI. Figs. 1-4: XV. Fig. 1 b; II, p. 4G8. I'l. 

 XLIII. Fig. 15 a; XLIV. Fig. 6. Fl. Fuss. Alask., p. 26, I'l. II. Fig. ha. Mice. Fl. Spitz., p. 

 55, PI. II. Fig. 13c; X Fig. 1 : XI. Fig. 8-/. .Alio,-. Bait. FL. p. 30. Pis. V., VI.. XII. Fig. 1 c. 



This species is very distinct, though variable in the form and size of 

 its leaves. Our specimens represent these leaves from four to fifteen cen- 

 timeters long, and from two to nine and a half centimeters broad. They 

 are generally gradually enlarged from the point to near the base, where 

 they become rounded or cordate to the petiole ; but sometimes in nar- 

 rower leaves, as in Fig. G, they are attenuated to the base. The bor- 

 ders are more or less deeply serrato-crenate, the teeth being either acute, 

 as in Figs. 2 and 8, or very obtuse, as in Figs. 1 and 5. The petiole is 

 slender, and of medium length. In Fig. 8 it seems very long; if, how- 

 ever, the plicature at the base of the specimen is really from a part of 

 the petiole of the same leaf, this would indicate a length of fourteen 

 to fifteen centimeters, equal to that of the leaf itself. The petiole of 



