92 



Elementary Work in Botany. 



calla, bearing in a consolidated mass yellow anthers above 



and greenish pistillate flowers below, is called a spadix; and 



the enclosing white leaf is a spathe. A raceme of racemes 



(compound raceme) is usually 

 called a panicle. Corymbs and 

 umbels are often compound. 



Fig. 73 shows forms of ter- 

 minal inflorescence. A cyme (a) 

 resembles a corymb but the plan 

 is very different as shown in the 

 figures. Cymes frequently re- 

 semble umbels but are easily 

 distinguished since an umbel has 

 the buds or youngest flowers in 

 the center. Sometimes terminal 



inflorescence takes the form shown at b and c in Fig. 73. At 



first view they seem to be racemes and are 



usually called scorpioid racemes. Usually 



in this kind of inflorescence the flowers 



are sessile and so densely crowded that 



they are thrown into two rows on the 



convex side of the stem which ends in a 



coil of buds as shown in Fig. 74.* 



Fig. 74. Scorpioid 



Study a, b and c in Fig. 73. Evidently inflorescence. 

 b is the same as a with all the branches on the left removed 



*On this coast, yellow or orange flowers in such scorpioid spikes belong to 

 amsinckias; blue ones, among wild flowers, are usually those of some kind of 

 phacelia; and some krinitzkias have white ones, larger than those of the blue for- 

 get-me-not, which also grow in coiled spikes. Heliotropes have this inflorescence. 



Fig. 73. Forms of terminal inflores- 

 cence, a. Cyme of an opposite-leaved 

 plant. 6. A one-sided cyme of a plant 

 with opposite leaves, c. Similar cyme 

 of a plant with alternate leaves. 



