Shapes of the leaves

The shape of the flap

The leaves can be distinguished according to the shape of the flap, that is the part of the leaf with which the petiole is attached to the branch. Based on the flap, the leaf is divided into: acinaciform, acicular, needle-like, winged, angled, astate, bicarenate, carinated, fleshy, cylindrical and full, cochlear, compressed, convex, convoluted, cordate, coriaceous, cuneiform, heart-shaped, deltoid, depressed, elliptical, ensiform, sickle-shaped, filiform, fistulous, flabellata, gibbous, puny, lanceolate, lesiniform, linear, linguiform, obcordata, oblanceolata, oblong, obovata, orbicular, ovata, ovato-oblique, panduriform, parabolic, folded, kidney-shaped, rigid, rhomboid, round, wrinkled, sagittata, scaly, scutata, silky, spatulate, scaly, triangular, trigone, tubulosa.

The shape of the margin

The shapes of the leavesit can also be subdivided on the basis of the margin that may have incisions; they are also classified according to the depth of the incisions. If the incisions on the margin are not very deep we can define the leaf: crenate, doubly crenate, toothed, indented, eroded, scalloped, serrated, sinuous or wavy. If, on the other hand, these marginal incisions are very conspicuous and therefore well delineated, we have a leaf: bilobed, split or lobed, reliable, lacerated, lacinata, lyrate, lobed, multipartita, lotto, pennatifida, pennatopartita, five-lobed, roncinata, sect, squarrosa, stipulated , sublobata, trifid, trilobate, tripartite. Regardless of the depth of the incisions with respect to the margin we have the leaf repanda, revoluta, involuta, marginata, truncated or smooth.

Upper and lower flap shape

If we want to classify a leaf in a complete and precise way, we must observe how the flap looks like. According to the shape of the upper limb, the leaf can be; apiculata, acute, obtuse, truncated, retusa, smarginata, acuminata, mucronata, mucronulata or tridentata. If, on the other hand, we take into consideration the lower part of the flap, that is the one placed at the base of the leaf, in correspondence with the beginning of the petiole, the leaf can still be classified into: heart-shaped, cordata, obcordata, ovate, attenuated, cuneata, round, truncated , truncata, asymmetrical, oblong, oblique, obtuse, obtusata, auriculata, perfoliata, sagittata, saettiform, astata, stipulata,

Shapes of the leaves: Classification of leaves and trunk

For a complete classification we must also consider the arrangement of the leaves in the stem. The latter are defined: seminal, primordial, bracteal, basal and finally caulinary. Depending on their arrangement along the trunk they can be: approached, imbricinate, fasciculate, twins, lace or quine. It is also useful to note how the posture of the trunk looks and the direction that this imposes on the leaves. On the basis of this observation we have leaves: erect or appressate, erect-patent, patent, curved, reflected, resurgent, inflected, oblique, vertical, resupinate.Also compared to the number of leaves that branch off from the petiole: unifoliate, bifoliate, trifoliate, If the leaf is multi-leafed, it is also good to distinguish between: pinnate, imparipennata, paripennata, tripennata, pettinata,

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