105 



of the secondary divergence of the fertile bract ; this torsion 

 tends to bring back the planes of the floral symmetry to par- 

 allelism. 



13. An accessory branch may originate beneath the pe- 

 dicel analogous to the central stem : a branch may originate 

 analogous to the axis of the first bract. 



14. Accidental exceptions to the preceding rules are now 

 and then met with ; the vegetables on which this exceptional 

 state is constant are very rare. 



The summary of the four following paragraphs is, 



1. The biparous cyme is essentially descendant or ascen- 

 dant : these two modifications do not appear to be met with 

 together in one and the same natural group. 



2. The biparous cyme is direct or inverse. 



3. The biparous cyme frequently ends by becoming unipa- 

 rous on its last branches ; the direct ascending cyme and the 

 inverse descending cyme then pass over to the scorpioid state ; 

 the inverse descending cyme and the direct ascending cyme on 

 the contrary pass into the helicoid state. 



4. The double uriiparous cyme is a particular case of these 

 modifications. 



5. The central flower of a double scorpioid cyme belongs to 

 the next concentric series to the primitive leaf. 



6. The two partial axillary cymes of a double terminal cyme 

 commence with pedicels parallel to each other : in the Bo- 

 raginece it is the last node that produces the parallel pedicels. 



7- The position of the terminal pedicel in the dichotomous 

 ramifications is determined by the value of the complimentary 

 divergences, and by the more or less excentric state of the 

 pedicels. 



8. The direct ascending cyme is not rare in the Apocynea 

 and Polemoniacece. 



9. The inverse ascending cyme appears to be characteristic 

 of the Ranunculacece ; several Ranunculi make exceptions 

 among the dicotyledonous plants by their uninodal cyme. 



10. The rectangular cyme is usually biparous, but some- 

 times it may be uniparous. 



11. The trinodal cyme is frequently but a variety of the 

 binodal, in which a node above the second, and heterotropous 

 with it, would precede the terminal flower. 



