65 



40. Leaves with entire margins, 41 



40. Leaves with toothed margins 44 



Page. 



41. Leaves even-pinnate, Gleditsia and Gymnocladus in Leguminosae 177 



41. Leaves odd-pinnate 42 



42. Leaflets small, elliiitlc; twigs tliorny Rohinia in Leguminosae 181 



42. Leaflets large, ovate; twigs not thorny 43 



43. leaflets 7-21, not toothed at base, without slflnds, 



Bhus Vernix und R. copallina in Anacardiaceae 1S3 



43. Leaflets 11-41, sometimes with 2-4 hhmt tvfth at base which have glands on lower 



side at the point of each tooth, Simarubaceae 187 



44. 1'wigs and leaves prickly; leaves twice or thrice compound, Araliaceae 199 



44. Twigs and loaves not prickly; leaves once compound 45 



45. Large trees; staniinute flowers in anients; fruit a nut, Juglandaceae 100 



45. Small trees; stamluate flowers not In aments; fruit red and flosliy 46 



46. Leaflets 12-15; sap not millty; brancheH heavy-tipped. 



Fyrua amerioana in Rosaceae 173 



46. Leaflets 11-31; sap milky; l>ranehes lu'iivy- tipped 



Rhus typhina and R. glabra in Anacardiaceae 1S3 



TABULATION OF GENERA AND SPECIES. 



Families, Genera, etc. 



Gynmospermae. 



Faro. I. Pinaceae. 



Gen. 1. Pious, 



Gen. 2. I^rix 



Gen. 3. Picea 



Gen. 4. Abies 



Gen. 5. Tsuga, 



Gen. 6. Chamaecyparis, 



Gen. 7. Thuya 



Gen. S. Juniperus, 



Angiospermae, 



Fam. n. Salicaceae. 



Gen. 9. Salix 



Gen. 10. Populus 



Fam. III. Juglandaceae 



Gen. 11. Juglans, 



Gen. 12. Carya. 



Fam. IV, Betulaceae. 



Gen. 13. Corylus 



Gen. 14. Ostrya 



Gen. 15. Carpinus, — 



Gen. 16. Betula. 



Gen. 17. Alnus 



Fam. V. Fagacoae. 



Gen. IS. Fagus 



Gen. 19. Castanea. ... 



Gen. 20. Quercus 



4 (15)' 

 4 



2 



5 (1) 



1 (1) 

 1 

 1 

 5 

 1 (1) 



1 



16 



