. A manual of the medical botany of North America [microform]. Botany, Medical; Botany; Botanique médicale; Botanique. BUDS AND LEAVES. 19 outstretcliod hand or the toes of a l)ir 1 ; hence such leaves are said to bo palmately, digitately, or pedately veined. Thv leaves of the maplo, Kjcanioro, and plant (Fij,'. 27) will nerve as illustrations. Between these two widely dillerent forms of venation in exogenous plants are other connecting ones, as when a leaf has both a mid-vein with more or less strongly marked lateral branches and largo diverging, palmate ])ranches also. Again, upo
. A manual of the medical botany of North America [microform]. Botany, Medical; Botany; Botanique médicale; Botanique. BUDS AND LEAVES. 19 outstretcliod hand or the toes of a l)ir 1 ; hence such leaves are said to bo palmately, digitately, or pedately veined. Thv leaves of the maplo, Kjcanioro, and plant (Fij,'. 27) will nerve as illustrations. Between these two widely dillerent forms of venation in exogenous plants are other connecting ones, as when a leaf has both a mid-vein with more or less strongly marked lateral branches and largo diverging, palmate ])ranches also. Again, upon the venation of loaves depends, to a very great extent, thoir lOarginal sliai)e. In parallel-vcincd leaves the niargui is commonly entire —that is, not notched or indented; the common grasses, cat-tails, and iris are familiar examples. In verj' many feather-veined leaves the mai-gin I. FlO. 28.—Marftinal sliajjes of leaves. Beginning at the right, tlic first is sorrtito, Bccond dcntnte, third be- tween dentate nnd crenatc, fourth cronate, fifth sinuate-toothed, sixth sinuate.' Traced from nature, is also entire, as for example the magnolias, laurel, and flowering dogwood, but more commonly they are variously notched or indented. Leaf mar- gins so indented are characterized in botanical descriptions by technical terms which ai'o, for the most part, self-explanatory; as for example (Fig. 28), serrate, saw-toothed ; dentate, toothed, but with teeth less regular than the preceding, and not pointing forward like them ; crenate, scal- loped ; repand, undulate, or wavy, when the margin makes a wavy line; sinuate, more strongly wavy or sinuous; incised, cut, jagged, etc. Again, when the margin is deeply cut into a definite number of di- visions, the leaf is said to be lobed, as throe-Iohed, fice-luhcd, or sseven-lobed. When cut more deeply than half way to the centre or base, the leaf is said to be cleft, and hence the terms ihree-clcft, Jive-deft, or trifld, Pleas
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