104 LABORATORY PRACTICE CHAP, xxiv 



3. The order of blossoming. 



4. Whether the flowers have pedicels or not. 



5. Make a diagram of the cluster studied. 



VIII. Indeterminate and Determinate Anthotaxy. The 

 order of blossoming in all the clusters studied thus far, has 

 been practically the same ; that is, from below upward or, in 

 the flattened clusters, from without inward. All arrange- 

 ments having this order of blossoming are classed under the 

 head of indeterminate anthotaxy. But in some clusters, the 

 order of blossoming is just the opposite ; that is, from above 

 downward, or in the case of flat- topped clusters, from within 

 outward. Such arrangements fall under the head of deter- 

 minate anthotaxy. The cyme is the most common example. 



Another distinction, and the one upon which the order of 

 blossoming depends, is that, in indeterminate anthotaxy, the 

 flowers are all lateral, while, in determinate, they are all 

 terminal. 



IX. The Cyme. Selecting a Begonia (preferably one 

 of the " tuberous " species with lax flower clusters and large 

 flowers), examine several clusters of different ages and 

 notice : 



i.. That the central flower blossoms first. 



2. That the two axes (one at each side) next the central 



flower, elongate, bear clusters of buds and that the 

 central bud of each cluster blossoms. 



3. That the two axes adjacent to each of these central 



flowers repeat the same process and so on regularly 

 for several times. 



4. Make diagrams to show this. 



5. Notice also that all the flowers are terminal upon short 



branches. 



