. Beginners' botany. Botany. i6o BEGINNERS' BOTANY. i-J(/(. Dense centrifugal clusters are usually flattish on top because of the cessation of growth in the main or central axis. These com- pact flower-clusters are known as cymes. Centrifugal clusters are sometimes said to be cymose in mode. Apples, pears (Fig. 220), and elders bear flowers in cymes. Some cyme-forms are like umbels in general appear- ance. A head-like cymose clus- ter is a glomerule; it blooms from the top downwards rather than from the base upwards. Mixed Clusters. — Often the cluster is mixed, being determi- nate in one part
. Beginners' botany. Botany. i6o BEGINNERS' BOTANY. i-J(/(. Dense centrifugal clusters are usually flattish on top because of the cessation of growth in the main or central axis. These com- pact flower-clusters are known as cymes. Centrifugal clusters are sometimes said to be cymose in mode. Apples, pears (Fig. 220), and elders bear flowers in cymes. Some cyme-forms are like umbels in general appear- ance. A head-like cymose clus- ter is a glomerule; it blooms from the top downwards rather than from the base upwards. Mixed Clusters. — Often the cluster is mixed, being determi- nate in one part and indeterminate in another part of the same clus- ter. The main cluster may be indeterminate, but the branches determinate. The cluster has the appearance of a panicle, and is usually so called, but it is really a thyrse. Lilac is a familiar example of a thyrse. In some cases the main cluster is determinate and the branches are indeterminate, as in hydrangea and elder. Inflorescence. — The mode or method of flower arrangement is known as the inflorescence. That is, the inflorescence is cymose, co- rymbose, paniculate, spicate, solitary, determinate, inde- terminate. By custom, however, the word " inflorescence " Fig. 219.— Determinate or Cymose Arrangement.— Wild Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bailey, L. H. (Liberty Hyde), 1858-1954. New York, The Macmillan company
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