156 О. Hagerup. 



assimilation or fructification shoot. Through the twisting 

 and turning of the petioles, the leaves apparently stand in 

 two rows, whereas in reality they are placed crosswise oppo- 

 site. It is always the leaves nearest the ground, which 

 support the most vigorous bud, and as a consequence of 

 this, the short-shoots are placed in a zig-zag line with 

 an ascending base. Fig. 1 illustrates this, which disagrees 

 with the general view, that the leaves have been placed in 

 two rows by the twisting of the stem. 



New rejuvenating shoots may appear by the development 

 of older and younger buds from all three kinds of shoots, which 

 enables the plant to spread in all directions (see Giger). 



The Asshnilation Shoot develops, as already mentioned, 

 from a side bud on the horizontal rejuvenating shoot. It is 

 characterised by a short axis (4 — 6 cm high) with 4 or 6 

 internodes, and especially by a relatively great number of 

 foliage leaves, which gain for it the name of assimilation 

 shoot; besides these leaves, one or two pairs of scale leaves 

 are present, which quickly wither. The axillary buds seldom 

 develop; the rejuvenescence is, as in the rejuvenating shoot, 

 monopodial; the terminal bud, covered by 1 or 2 pairs of 

 scale leaves, develops during the following period of growth 

 into a shoot similar to that of the previous year; this 

 is continued for 3 or 4 years, when at last the shoot ceases its 

 function. New assimilation shoots may also develop from 

 older or younger side shoots or end shoots, of any of the 

 other kinds of shoots (see Giger). 



The Fructification Shoot consists of two different parts, 

 viz. a lower vegetative part, which is perennial, and an 

 upper floral one, which is annual. 



Of these the lower one is much like the just mentioned 

 assimilation shoot, but differs by nearly always sending out 

 adventitious roots from its ascending base. The shoot ter- 



