102 cj iLABQK;ATaRY PRACTICE CHAP. xxiV 



(&} Pedicels, the stalks of the individual flowers. 

 (f) Bracts, the leaves or scales subtending each 

 flower. 



II. The Corymb. Examine the flower cluster of a Haw- 

 thorn and notice : 



1 . The general shape of the cluster {flat-topped} . 



2. The peduncle. 



3. The pedicels of different lengths, so as to bring all the 



flowers to the same level. 



4. The order of blossoming. Compare it with that of the 



raceme. 



5. That all the flowers are lateral axillary structures. 



6. Make a diagram to show these points. 



III. The Umbel. Examine the flower cluster of an 

 Onion or a Pelargonium (the so-called Geranium of the 

 gardens) and notice : 



1. The pedicels of equal length. 



2. The fact that they all spring from the same point. 



3. Make out the order of blossoming if you can. 



4. Make a diagram of an umbel. 



IV. The Compound Umbel. Examine the flower cluster 

 of a Carrot, Parsnip, Fennel, Caraway Seed, or Poison Hem- 

 lock and notice : 



1. The fact that a number of small umbels are themselves 



arranged after the fashion of an umbel. 



2. Study one umbellet (small umbel) as directed in III. 



3. Notice the circle of bracts at the base of the umbel 



(called an involucre}. 



4. The circle of smaller bracts (bractlets} at the base of 



each umbellet (called an involucel}. 



