62 



OF TEXTURE AND SURFACE. 



compound in all stages. The leaves of the honey-locust and coffee tree (Gymno- 

 cladus) often afford curious and instructive examples. 



291. A BiTBENATE LEAP is formed when the leaflets of a ternate leaf 

 give place themselves to ternate leaves, and triternate when the leaflets 

 of a biternate leaf again give place to ternate leaves. 



292. Palmately compound. A distinction. The palmate vena- 

 tion has also its peculiar forms of compound leaves, as ternate, quinate, 

 septinate, etc., according to the number of leaflets which arise together 

 from the summit of the petiole. Ternate leaves of this venation are to 

 be carefully distinguished from those of the pinnate plan. The pal- 

 mately ternate leaf consists of three leaflets, which are either all sessile 

 or stalked alike ; the pinnately ternate has the terminal leaflet raised 

 above the other two on the prolonged rachis (15*7, 158). 



1T2 in ITO 



Insertion of leaves. 170, Astei oblongifolins 1 (amplexieanl). 171, Uvnlaria perfoliata; 

 172, Lonicera sempervirens, (connate). 



With regard to the insertion the leaf is said to be 



293. Amplexicaul, when its base lobes adhere to and clasp the stem. 

 Should these lobes extend quite around the stem and become blended 

 together, on the other side a perfoliate leaf will be formed {per, through, 

 folium, leaf), the stem seeming to pass through the leaves. 



294. Connate denotes that the bases of two opposite leaves are 

 united so as to form one piece of the two. 



OF TEXTURE AND SURFACE. 

 In descriptive botany it ia also needful to regard the variations of leaves in the 

 ahove respects. The terms which we briefly notice below are equally applicable to 

 any other organs. 



