LEAVES 



161 



as in eucalyptus; it is elliptic when it is nearly twice as long 

 as broad, widest in the center and the margins tapering 

 gradually toward the apex and petiole, as in Canada tick 



FIG. 96. Outline of Simple Leaves. 1, Acerose, white pine (Pinus 

 strobus) ; 2, subulate, low juniper (Juniperus nana) ; 3, linear, everlasting 

 (Anaphalis margaritacea) ; 4, oblong, common milkweed (Ascelpias syriaca) ; 

 5, lanceolate, smartweed (Polygonum hydropiper) ; 6, falcate, blue gum 

 (Eucalyptus globulus) ; 7, elliptic, Canada ticktrefoil (Meibomia canadensis) ; 

 8, ovate, dogbane (Apocynum androscemifolium) ; 9, rotund, wintergreen 

 (Gaultheria procumbens). 10, cordate, aster (Aster macrophyllus) ; 11, reni- 

 form, wild ginger (Asarum canadense) ; 12, oblanceolate, lupine (Lupinus 

 perennis) ; 13, spatulate, everlasting (Antennaria plant aginifolia) ; 14, obo- 

 vate, chokecherry (Prunus virginiana) ; 15, deltoid, gray birch (Betula 

 populifolid) ; 16, cuneate, black oak (Quercus nigra.) 



trefoil; it is ovate when it is rounded at the base, not much 

 longer than broad, and broadest below the center, as in 

 dogbane ; it is rotund when the blade is nearly circular in out- 

 11 



