126 



BOTANY 



daughter axes. In the former case a true main axis or MONOPODIUM 

 can be followed throughout the entire branch-system (cf. Fig. 82 b). 

 Such typical MONOPODIAL BRANCHING is exhibited, for example, by 

 the Pine and other Conifers with a pyramidal outline; the radial 

 orthotropous main shoot grows vertically up- 

 wards under the influence of gravity (cf. p. 

 339), while the dorsiventral lateral branches 

 of the first order diverge on all sides horizon- 

 tally from the main axis. If the lateral branches 



FIG. 145. Spike of Plantago 

 lanceolata. (After Du- 



CHARTRE.) 



FIG. 146. Catkin of Corylus 

 americana. (After Du- 



CHARTRE.) 



FIG. 147. Raceme of Linaria 

 striata. d, Bracts. (After 



A. F. W. SCHIMPER.) 



of the first order grow erect, as in the Cypress and in many shrubs, 

 there may be no difference in length between them and the main 

 axis ; the branch-system has in such cases an oval or spherical form. 



The racemose inflorescences may be divided in the following way : 

 I. The main axis grows more strongly than the lateral axes. 



(a) Lateral axes nnbranched. 



1. RACEME : stalked flowers borne on an elongated main axis (Fig. 147, 



Fig. 150 A). 



2. SPIKE : flowers sessile on an elongated main axis (Fig. 145, Fig. 150 B}. 



A spike in which the axis is thickened and succulent is termed a 

 SPADIX ; a spike which, after flowering or after the fruits have ripened, 

 falls off as a whole is a CATKIN (Fig. 146). 



(b) Lateral axes branched. 



3. PANICLE : a main axis bearing racemes laterally (Fig. 150 E, Fig. 149). 



