36 



PART I. MORPHOLOGY. 



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point, in divergent succession, that is, both acropetally and basi- 

 petally (e.g. Achittea MillefoUum, etc.). 



With regard to palmate leaves, Fig. 23 A is an example of a deeply 

 lobed lamina; and B, of a compound palmate leaf of the Clover in which 

 will be observed that there are three leaflets ; such a leaf is said to be 



FIG. 23. Segmentation of leaves, p Petiole ; p' petiolule ; /' leaflet ; r phjllopodiutn. A 

 Palmatifldor palmately lobed leaf of Geranium. B Temate (compound palmate) leaf of 

 Clover. C Pinnaticected leaf of Shepherd's Purse (Capsella). Compound pinnate leaves : 

 D Imparipinnate leaf of Hippocnpit comoo; t terminal leaflet. E Paripinnate leaf of 

 Pistacia Lentitcus ; a wing of the phyllopodinm. F Imparipinnate unijugate lenf of Medi- 

 cago. This differs from B, which is teraate, inasmuch as the secondary leaf-stalks p' do 

 not all spring from one point, but the common leaf-stalk ji extends beyond the insertion 

 of the single pair of pinnse ; projecting rib, or mucro. G Leaf of the Oranae ; the articu- 

 lation a between the blade and the winged petiole shows that it is really a compound 

 leaf with a single terminal leaflet. H Bipinnate leaf of Acacia : r' secondary axis ; /" 

 secondary pinnae or pinnules. 



