EXPLANATION OF THE PLATES. 



PLATE I. 



1, Seedling of Acer rubi*um ; 2 and 3, axial, ramose 

 roots ; 4, a napif orm or turnip-shaped root ; 5, a fusiform 

 root; 6, tubers of the Potato ; 7, root-stock of Trillium; 

 8, tuber of Arethusa bulbosa ; 9, rhizome of Polygon atum ; 

 10, fascicled roots; 11, a corm ; 12, a bulb. 



Forms of Leaves ; JS'amely — 13, heart-shaped (and pe- 

 tioled) ; 14, linear ; 15, awl-shaped ; 16, ovate ; IT, wedge- 

 shaped; 18, rhombic ; 19, rounded-cordate ; 20, spatulate ; 

 23, lanceolate ; 24, halberd-shaped ; 25, fiddle-shaped ; 26, 

 arrow-shaped; 28, kidnej-form; 29, peltate; 30, per- 

 forated ; 31, clasping or amplexicaul ; 33, connate and per- 

 foliate. ' 



Position of Leaves : 21, alternate ; 22, opposite (and 

 sessile) ; 32, whorled. 



Petioles, buds, stipules, ligules, tendrils, titorns: 

 37, the dilated petiole of an Umbel wort ; 34 and 35, ter- 

 minal and axillary buds of Maple; 27, united stipules of 

 Polygonum orientale, forming a sheath ; 36, leaf and ligule 

 of a grass ; 38, a leaf and tendril of grape ; 39, stipular 

 thorns of Bobinia Pseudacacia. 



PLATE II. 



1, Branching thorn of Gleditschia triacanthos, developed 

 from a supernumerary bud above a leaf -axil ; 2, a runci- 



