Description of Plate I.— Figs 1-7, B. Noveboracense : 1 and 2. Cap- 

 sules. 7. Stem leaf. 6 and ^. Basal angle and apex of the same. 5. Stem 

 leaf with double costa. 4 Branch leaf. Figs. 8-12, B. Wasliingtonianum : 

 10. Stem leaf. 12. Basal angle of the same. 11. Branch leaf 



