ffOW SOMM PLANTS GET UP IN THU WORLD 



401 



505a. This recalls our discussion (Obs. xviii.) of the disguises of 

 leaves, for we then found that leaflets may be represented by tendrils. 

 If the pupil will study the position of tendrils of the grape, he will find 

 that they occupy the places of flower-clusters. (Has he not seen a 

 bunch of grapes with one or two ten- 

 drils protruding?) Let him determine 

 the morphology of the tendrils of cu- 

 cumbers and melons. Observe, also, 

 how the garden nasturtium, or tropseo- 

 lum, climbs. 



506. The trumpet creeper, 

 poison ivy, true 

 or English ivy, 

 and some other 

 plants, climb 

 by roots 

 which attach Ij 

 themselves 

 the support, f^ 

 Observe that such 

 occupy the dark 

 on the building 

 which they climb. 



507. Many plants are mere scramblers, as some 

 tall forms of blackberries, galiums (Fig. 63), some 

 of the smart -weed tribe or polygonums. Such 

 plants are often provided with various hooks or 

 prickles by means of which they are secured to 

 the support as they grow; but it by no means 

 follows that all hooks or prickles on plants serve 



roots prefer to 



places or chinks 



or bark upon 



AA 



