206 



ORGANOGRAPHY 



2. Definite, Determinate, or Terminal Inflorescence. 

 — In this class of inflorescence the ])rimary axis (as we have 

 seen) is arrested in its growth at an early age by the develop- 

 ment of a terminal flower-bud, and if tlie axis bears no other 

 flowers this is called a solitary terminal flower, and is the sim- 

 plest form of definite inflorescence. It may be seen in the 

 stemless Gentian {Genliaria acaulis) {Jig. 408), in the Wood 



Fig. 408. 



Fig. 409. 



Fig. 408. Floral axis of a 

 species of Gentian {Genti- 

 anu acuulis), terminated 

 by a solitary flower, below 



which are two bracts. 



Fig. 400. A plant of a 

 gpccies of Ranunculus (/fa- 

 itiDir.iilus hnlbosiis). a', a'. 

 Primary axis terminated by 

 a fully expanded flower/'. 

 a". Secondary axis which 

 is also terminated by a 

 flower/", not 8o fully de- 

 veloped as/', a'". Terti- 

 ary axis terminated by a 

 flower-bud/'". 



Anemone {Anemone ncmorosa), &c. When other flowers are 

 ]»roduced on sncli an axis they must necessarily arise from 

 axillary l)uds i)laccd below the terminal flower-bud, and if these 

 form secondary axes {fig. 409, a") they will in like manner be 

 arrested in their growth" by a terminal flower-bud y", and if 

 other axes a'" are develoi)ed from the secondary, these also 

 must be axillary, and will 1)e arrested in a similar manner f", 

 and may also form othersof a like cliaracter, and so on. Hence 

 this mollc of iiiHorcsccnce is determinate, definite, or terminal, in 

 contradistinction to the former or indefinite inflorescence al- 



