[222.] A Glomerule is a cyme still more compacted, so as to imitate a head. It may be known from a true head by the flowers not expanding centripetally, that is, not from the circumference towards the centre.
223. The illustrations of determinate or cymose inflorescence have been taken from plants with opposite leaves, which give rise to the most regular cymes. But the Rose, Cinquefoil, Buttercup, etc., with alternate leaves, furnish also good examples of cymose inflorescence.
[224.] A Cymule (or diminutive cyme) is either a reduced small cyme of few flowers, or a branch of a compound cyme, i. e. a partial cyme.
[225.] Scorpioid or Helicoid Cymes, of various sorts, are forms of determinate inflorescence (often puzzling to the student) in which one half of the ramification fails to appear. So that they may be called incomplete cymes. The commoner forms may be understood by comparing a complete cyme, like that of Fig. [215] with Fig. [216], the diagram of a cyme of an opposite-leaved plant, having a series of terminal flowers and the axis continued by the development of a branch in the axil of only one of the leaves at each node. The dotted lines on the left indicate the place of the wanting branches, which if present would convert this scorpioid cyme into the complete one of Fig. [215]. Fig. [217] is a diagram of similar inflorescence with alternate leaves. Both are kinds of false racemes ([219]). When the bracts are also wanting in such cases, as in many Borragineous plants, the true nature of the inflorescence is very much disguised.
Fig. 215. A complete forking cyme of an Arenaria, or Chickweed.
Fig. 216. Diagram of a scorpioid cyme, with opposite leaves or bracts.