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PLANTS EXOGENAE. 
SUB-SERIES. 
Perigonium single, petals 0, or soldered 
to the calyx P. E. monochlamydece. A* 
Perigonium double ; petals soldered into 
one, stamen-bearing, inserted into the tha- 
lamus P. E. corolliflorce . B, 
Perigonium double; petals many, dis- 
tinct, or soldered together, inserted along 
with the stamens on the calyx P. E. calyciflorce . C. 
Perigonium double; petals many, distinct, 
inserted along with the stamens on the 
thalamus P. E. thalamiflorce. D. 
Subseries III. A. Plants exogen,® monochlamydeas. 
JDicotyledones apetalce, Jussieu Gen. Plant. 
Dicot yledones diclines irregular es , Jussieu Gen. Plant. 
Dicotyledones incomplete De Candolle Syn. FI. Gall. 
Perigonium single ; petals none, or soldered to the calyx. 
FAMILIES. 
A. Flowers unisexual , male amentaceous ; perisperm fleshy ; 
leaves biennial. 
Nuculce many,- reversed, in a cone . . ABIETIDEiE. 1. 
Nuculce few, upright, in a galbulum 
CUPRESSIDEiE. 2. 
Nucula single, upright TAXIDEiE. 3. 
B. Flowers unisexual , male amentaceous ; perisperm 
none ; leaves annual. 
Nucula , in a cone BETULIDEiE. 5. 
Gland or nucula , in a cupula CORYLIDEiE. 6. 
Capsule 1 or 2-celled; seed comose SALICINAL 4. 
Nut 1 -seeded, in an ament MYRICEAS. 7. 
C. Flowers hermaphrodite ; or unisexual , the male not 
amentaceous ; ovary free. 
Utriculus j perisperm 0 ; flowers unisexual 
URTICEZE. 9« 
Utriculus ; perisperm farinaceous ; 
leaves sheathing at the base POLYGONEJE. 15< 
