'CUPULIFEILE 541 



Betula alba, L. (fig. 672). 



Hypocotyl erect, terete, pale green, densely pubescent, 8 mm. 

 above the soil. 



Cotyledons small, oblong-ovate, obtuse, petiolate ; lamina gla- 

 brous, 3-4 mm. long, 2-5-3 mm. wide ; petiole grooved above, 

 rounded and pubescent on the back, 1*5 mm. long. 



Stem woody, erect, terete, pubescent at the base, hairy up- 

 wards, ultimately with the bark peeling off longitudinally in stripes 

 leaving the trunk white ; 1st internode 4 mm. long ; 2nd 6 mm. ; 

 3rd 4 mm. ; 4th 7 mm, ; 5th 9'5 mm. 



Leaves simple, cauline, alternate, stipulate, petiolate, alternately 

 penninerved, glandular on both surfaces and hairy when in the 

 young or seedling stage, ultimately glabrous and dotted with sessile 

 glands on both surfaces, deep green above, pale beneath ; petioles 

 subterete, channelled above, densely pubescent in the seedling 

 stage, glabrous in adult specimens after full development, slightly 

 twisted so as to bring the surface of the leaf up to the light in 

 pendent branches ; stipules small, ovate or triangular, ciliate, 

 caducous. 



No. 1. Small, ovate, trifid, three- or obscurely five-nerved. 



No. 2. Ovate, obtuse, serrate, five-nerved at the base, alternately 

 pennmerved upwards. 



No. 3. Triangular, coarsely serrate. 



No. 4. Triangular-ovate, coarsely serrate. 



No. 5. Triangular-ovate, coarsely almost doubly serrate, sub- 

 cuneate at the base. 



No. 6. Cordate, acute, lobulate-serrate or doubly serrate. 



Ultimate leaves ovate, acuminate, doubly serrate, subcuneate at 

 the base, glabrous, glandular on both surfaces, fragrant. 



SALICINE.E. 



Benth. et Hook. Gen. PI Hi. 411. 



Fruit and Seed. The ovary is superior, and one-celled with 

 two to four parietal placentas. The ovules are numerous, in- 

 serted in two or many series on the placentas below the middle 

 of the ovary, ascending and anatropous. The fruit is capsular, 

 and ovoid or oblong, dehiscing by two or four valves according 



