KEY 



To trace a plant to its natural Order based upon those char- 

 acters which are most obvious. 



Subkingdom I. FLOWERING PLANTS (Phaenogams). 



Class I. DICOTYLEDONOUS ANGIOSPERMS. 



Leaves uetted-veined. Flowers rarely 3-])arte(l, mostly 4-5-parted. Wood, 



if any, in concentric rings. 

 Seed in a vessel. Stigmas present. Embryos with 2 cotyledons. 



Cohort I. 



Calyx aiul corolla present ; petals separate, sometimes wanting, in which case the 

 sepals are bright colored. APOPET AL-^. 



Cohort n. 



Calyx and corolla present : petals more or less united. SYMPETAL-(E. 



Cohort m. 



Calyx present, but no corolla, or both wanting. APETAL-^. 



Class II. MOXOCOTYLEDONOUS ANGIOSPERMS. 



Leaves parallel-veined (rarely netted). Flowers .3-parted. Bark and wood 

 commingled with pith. Koot not axial. Embryo with one cotyledon. 



Cohort IV. 



Flowers in a spadix. SPADICIFLOR.(E. 



Cohort V. 



Floral envelope in two .'i-parted whorls; outer one green or colored (Lilies, etc.). 



PETALOIDE^. 

 Cohort VI 



Floral envelope chatf-like (Grasses and Grains). GLUMIFER,^. 



Class III. GYMNOSPERMS. 



Stigma wanting. Seed naked. Hark and wood ribors in concentric rings. 



Cohort Vn 



Cone-bearing plants (Pines, etc.). CONIFER-ffi. 



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