FORMS OF LEAVES, Ul 



leaves the footstalk, if present, 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 Thisdc, most kinds of Cranesbill, as Gera- 

 nium pratense^ Engl. Bot. t. 404, &c. 



Leaves are frequently undivided and lobed on the same 

 plant, as the Hop, Engl. Bot. t. 427.(55.) 



4. The following are the most remarkable forms of 

 Simple Leaves, considering their outline only. 



Orbiculatwn, f. 38, a circular or orbicular leaf, whose 

 length and breadth are equal, and the circumference 

 an even ciixular line. Precise examples of this are 

 scarcely to be found. Some species of Piper ap- 

 proach it, and the leaf of Hedysarum styracifolium is 

 perfectly orbicular, except a notch at the base. 



Subrotimdum.f. 39, roundish, as Pyrola^ (56) Engl. 

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



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

 wise, the base being rounded and broader than the 

 extremity, a very comm.on form of leaves, as Urtica 

 pilulifera, t. 148, and Vinca major ^ t. 514. 



Oiovatitm^ /^ 41, obovate, of the same figure with the 

 broader end uppermost, as those of the Primrose, t. 

 4, and the Daisy, t. 424.(57) Linn^us at first used 

 the words obverse ovatum. 



(55) [This is the case in the Sassafras tree, Zaz^r?/s sassafras.^ 



(56) [The Pyrola rotundifoUat or Winter green, is very com- 

 mon in the United States.] 



(57) [And the leaves of Clcthra Mnisolia.'] 



