Fig. 208. Compound Umbel of Caraway.
215. The secondary or partial umbels of a compound umbel are Umbellets. When the umbellets are subtended by an involucre, this secondary involucre is called an Involucel.
216. A Compound raceme is a cluster of racemes racemosely arranged, as in Smilacina racemosa. A compound corymb is a corymb some branches of which branch again in the same way, as in Mountain Ash. A compound spike is a spicately disposed cluster of spikes.
Fig. 209. Diagram of a simple panicle.
[217.] A Panicle, such as that of Oats and many Grasses, is a compound flower-cluster of a more or less open sort which branches with apparent irregularity, neither into corymbs nor racemes. Fig. [209] represents the simplest panicle. It is, as it were, a raceme of which some of the pedicels have branched so as to bear a few flowers on pedicels of their own, while others remain simple. A compound panicle is one that branches in this way again and again.
Fig. 210. Diagram of an opposite-leaved plant, with a single terminal flower. 211. Same, with a cyme of three flowers; a, the first flower, of the main axis; b b, those of branches. 212. Same, with flowers also of the third order, c c.