INDETERMINATE INFLORESCENCE 



175 



are longer below and shorter above, so that the flower cluster 

 is almost flat- topped. A compound corymb is composed of 

 several corymbs, as in yarrow. An umbel has numerous 



FIG. 108. Arrangement of Flowers. Umbels. 1, Common milkweed 

 (Asclepias syriaca); 2, wild sarsaparilla (Aralia nudicaulis), Compound 

 Umbels. 3, water hemlock (Cicuta maculata) ; 4, American angelica (Angelica 

 atropurpurea) , Anthodiums. 5, ox-eyed daisy (Rudbeckia hirtd), Rayless 

 Anthodium. 6, tansy (Tanacetum vulgare). Determinate Infloresence; Cyme 

 7, bouncing Betty (Saponaria officinalis), Compound cyme; 8, mouse-ear 

 (Cerastium vulgatum); 9, elder flowers (Sambucus canadensis). Glomerule; 

 10, dogwood (Cornus floridd) . 



flowers with long pedicles growing from the end of the pe- 

 duncle, as in milkweed and wild sarsaparilla. A compound 

 umbel has numerous small umbels attached to peduncles de- 

 veloping and radiating from the main stem of the plant, as in 



