KEY TO THE ORDERS. 



Cone-bearing plants, the so-called "Evergreens" 4. 



Plants not cone-bearing, leaves not needle-shaped nor awl-shaped 1 . 

 1. Stems endogenous, leaves mostly parallel-veined; fls. usually M-parted ■> . 

 1. Stems exogenous. Ivs. mostlj- netted-veined : fls. usually .Vparled 2 . 



2. CaU-x and corolla both present 3 . 



2. Corolla and sometimes also the calyx wanting 11 . 

 o. Corolla of separate petals 40 . 



3. Corolla of more or less united petals ;94). 



GYMNOSPERMOUS PLANTS. 



4. Trees or shrubs: leaves scale, awl or needle-shaped Coniferce. 17 



ANGIOSPERMOUS PLANTS. 

 MONOCOTYLS. 



•">. Kls. on a spadi.x : Ivs. petioled. mostly netted-veined Aracaa. IS 



5. Flowers not on a spadi.x 6 



6. Perianth adherent to the inferior ovary 7 . 

 6. Perianth free from the superior ovary ;9i. 



7. Flowers dioecious or polygamous ; stem twining Dioscoreacea:. 25 



7. Flowers perfect: stems not twining s. 



8. Stamens united with the pistils: fls. irregular Oichidacece. 2ti 



8. Stamens three: leaves 2-rauked IridacecE. 2-J 



8. Stamens six: flowers on a scape from a bulb Ainaryllidacea. 24 



i*. Anthers 1-celled : fls. dioecious: plants tendril-bearing Smilaceee. 24 



9. Anthers 2-celled : plants not tendril-bearing 10. 



10. Perianth of similar divisions or lobes, mostly colored : or of ;> 



foliaceous sepals and 3 colored, persistent petals Liliacecc. 19 



10. Perianth of 3 persistent sepals and 3 ephemeral petals. Co»iinelinaceer. 19 



DICOTYLS. 



APETALOUS GROUP. 



11. Flowers not in catkins 20 . 



11. Flowers, one or both sorts, in catkins 12 . 

 12. Only one sort of flowers in catkins or catkin-like heads 13 

 12. Both sterile and fertile flowers in catkins or catkin-like heads l-i 



13. Fertile flowers in a short catkin or head VoiaceiT. 3H 



13. Fertile flowers, single or clustered, the sterile in catkins 14 . 



