222 PLANTS EXOGEN^. 



SUB-SERIES. 



Perigonium single, petals 0, or soldered 

 to the calyx , P. E. monochlamydece. A= 



Peri^onkim double ; petals soldered into 

 one, stamen-bearing, inserted into the tha- 

 lamus P. E. coroU'i/lorce. B, 



Perigonium double; petals many, dis- 

 tinct, or soldered together, inserted along 

 with the stamens on the calyx P. E. calycijiorce. C, 



Perigonium double; pe/Q/.? many, distinct, 

 inserted along with the stamens on the 

 thalamus P.E. thalamifiorce. D. 



Subseries III. A. Plants exogen^ monochlamyde^. 

 Dicotyledones apeialce, Jussieu Gen. Plant. 

 Dicotyledones diclines irregulares, Jussieu Gen. Plant. 

 Dicotyledones incompletce, De Candolle Syn. Fl. Gall, 



Perigonium single ; petals none, or soldered to the calyx, 



FAMILIES. 



A. Flowers unisexual, male amentaceous ; perispermjieshy ; 

 leaves hiennial. 



NuculcB many, reversed, in a cone . . ABIETIDEiE. 1. 

 Nuculce few, upright, in a galbulum 



CUPRESSIDE^. 2. 

 Nucula single, upright TAXIDE^. 3. 



B. Flowers unisexual, male amentaceous ; perisperm 

 none J leaves annual. 



Nucula, in a cone BETULIDE^. 5. 



Gland or nucula, in a cupula CORYLIDEiE. 6. 



Capsule 1 or 2-celled; seed comose SALICIN-^. 4. 

 Nut 1 -seeded, in an ament MYRICEiE. 7. 



C. Flowers hermaphrodite ; or unisexual, the male not 

 amentaceous ; ovary free. 



Utriculus ; perisperm ; flowers unisexual 



URTICE^. 9. 

 Utriculus ; perisperm farinaceous ; 

 haves sheathing at the base POLYGONEiE. 15. 



