TORMSOF LEAVES. 117 



must of course be simple,, while in compound 

 ones it must always be present, though not always 

 subdivided. 



Simple leaves are either Integra, undivided, as those 

 of Grasses and Orchises ; or lobata, lobed, like 

 the Vine, the Thistle, most kinds of Cranesbill a 

 as Geranium pratense, Engl. Bot. t. 404, &cv 



Leaves are frequently undivided and lobed on the 

 same plant, as the Hop, Engl. Bot. t. 427. 



4. The following are the most remarkable forms of 

 Simple Leaves, considering their outline only. 



Orbiculatum, f. 38, a circular or orbicular leaf, 

 whose length and breadth are equal, and the cir- 

 cumference an even circular line. Precise ex- 

 ample!* of this are scarcely to be found. Some 

 species of Piper approach it, and the leaf of 

 Hedysarum styraclfollum is perfectly orbicular, 

 except a notch at the base. 



Subrotundum, f. 39, roundish, as Pyrola, Engl. 

 Bot. t. 146, 158 and 213, and many other 

 plants. 



Ovatum, f. 40, ovate, of the shape of an egg cut 

 lengthwise, the base being rounded and broader 

 than the extremity, a very common form of 

 leaves, as Urtlca pilultfera, t. 148, and Vinca 

 major, t. 5 14. 



Obovatum, f. 41, obovate, of the same figure with 

 the broader end uppermost, as those of the Prim- 



