BULBILS OF LYSIMACHIA 



319 



415. Propagation by Means of Runners, Stolons, Offsets, etc. 

 Make observations on any plant in the greenhouse or fields that 

 develops lateral trailing branches, and look for buds which may- 

 give rise to a new plant. Fragaria, Rubus, Ranunculus and a 

 large number of other species furnish suit- 

 able material. Follow the development of 

 such buds and note the manner of separa- 

 tion of the plantlets from the parent. 

 Note also at what season propagation 

 takes place ; does it coincide with the for- 

 mation of seeds ? (See Figs. 149, 150.) 



Many plants, notably the willows, have 

 slender twigs, which are easily broken 

 from the stem and if thrown into moist 

 soil or water develop roots and form a 

 new individual. 



416. Bulbils of Lysimachia. Note the 

 formation of shortened branches by Lysi- 



w 



\f 



) 



151 152 



Fig. 151. Bulbils in upper axils of stem of Lysimachia terrestris. 

 Fig. 152. Germination of bulbil, in which a leafy shoot is produced, and the bulbil 

 completes its development by becoming a rhizome. 



machia terrestris in the autumn on plants growing in the open, 

 or upon shoots forced from the rhizomes brought into the green- 

 house at the close of the season. Examine structure of such 

 branches ; they will be found to consist of a short branch in 

 which the stele is in an undeveloped condition, with only pro- 



