KEY TO SOME FAMILIES OP PHANEROGAMS. 



GirMNOSPERMS. Ovules not enclosed in an ovary. 



Trees or shrubs usually with needle-shaped, or scale- lilie, evergreen leaves and 

 monoecious or dioecious flowers in cattins, the pistillate ones usually ripening 

 into cones (Coniferse), Pine Family, 7. 



ANGIOSPBRMS. Ovules in an ovary. 



MONOCOTYLEDONS. Flowers generally on plan of 3 (never of 5). 



Glumaceous , DIVISION. Flowers rudimentary, enclosed in husk-like 

 bracts. 



Bracts for each flower 2 (Grarainese), stems cylindrical or 



nearly so, Grass Family, 9. 

 Bract for each flower 1 (Cyperaceae), Stems triangular, 

 Sedge Family, 10. 

 Spamceous division. Flowers clustered on a spadix (Aracese), Arum 



Family, 11. 

 Petaloideous division. Flowers having a true perianth ; not on a spa^x. 

 Ovary free from perianth, stamens 6 (Liliacese), Lily Family, 12. 

 Ovary adnate to perianth. 



Stamens 6 . . . . (Amaryllidacese), Amaryllis Family, 15. 



Stamens 3 (Iridacese), Iris Family, 15. 



Stamens 1 or (rarely) 2 . . (Orohidacese), Orchis Family, 16. 

 DICOTYLEDONS. Flowers generally on plan of 5 or 4. 



Apetalous. Flowers without corolla (sometimes also calyK wanting). 

 Flowers in catkins. Dioecious trees or shrubs ; fruit, apod (SalicaceBB), 



Willow Family, 17. 

 Flowers in catkins. Monoecious trees or shrubs ; fruit, a nut (Cupu- 



liferse). Oak Family, 18. 

 Flowers not in catkins. (Here occur a few apetalous genera of certain 

 polypetalous families.) 

 Stipules sheathing the stem at the nodes (Polygonaoese) , Buck- 

 wheat Family, 19. 

 Stipules not sheathing the stem, or absent ; plants usually with a milky 

 acrid juice (Euphorbiacese), Spurge Family, 31. 



[Here come alBO Elms, some Maples, etc.] 



