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The following terms are used to describe leaf morphology in the description and taxonomy of plants. Leaves may be simple (a single leaf blade or lamina) or compound (with several leaflets). The edge of the leaf may be regular or irregular, may be smooth or bearing hair, bristles or spines. For more terms describing other aspects of leaves besides their overall morphology see the leaf article. The terms listed here all are supported by technical and professional usage, but they cannot be represented as mandatory or undebatable; readers must use their judgement. Authors often use terms arbitrarily, or coin them to taste, possibly in ignorance of established terms, and it is not always clear whether because of ignorance, or personal preference, or because usages change with time or context, or because of variation between specimens, even specimens from the same plant. For example, whether to call leaves on the same tree "acuminate", "lanceolate", or "linear" could depend on individual judgement, or which part of the tree one collected them from. The same cautions might apply to "caudate", "cuspidate", and "mucronate", or to "crenate", "dentate", and "serrate". Another problem is to establish definitions that meet all cases or satisfy all authorities and readers. For example, it seems altogether reasonable to define a mucro as "a small sharp point as a continuation of the midrib", but it may not be clear how small is small enough, how sharp is sharp enough, how hard the point must be, and what to call the point when one cannot tell whether the leaf has a midrib at all. Various authors or field workers might come to incompatible conclusions, or might try to compromise by qualifying terms so vaguely that a description of a particular plant practically loses its value. Use of these terms is not restricted to leaves, but may be applied to morphology of other parts of plants, e. g. bracts, bracteoles, stipules, sepals, petals, carpels or scales. Some of these terms are also used for similar looking anatomical features on animals.

Being one of the more visible features, leaf shape is commonly used for plant identification. Similar terms are used for other plant parts, such as petals, tepals, and bracts. Image Term Latin Refers principally to Description acicularis whole leaf Slender and pointed, needle like acuminatus leaf tip Tapering to a long point in a concave manner leaf tip or base Pointed, having a short sharp apex angled less than 90° apiculatus leaf tip Tapering and ending in a short, slender point aristatus leaf tip Ending in a stiff, bristle like point whole leaf With the blade shape different on each side of the midrib attenuatus leaf base Having leaf tissue taper down the petiole to a narrow base and always having some leaf material on each side of the petiole auriculatus leaf base Having ear shaped appendages reaching beyond the attachment to the petiole or stem (in case of a seated leaf) caudatus leaf tip Tailed at the apex , leaf tip Having a rachis that extends beyond the leaf blade or leaflets into a long whip like extension or cirrus (common in climbing palms); antonym: ecirrate , cordatus whole leaf or base Heart shaped, with the petiole or stem attached to the notch cuneatus leaf base Triangular, wedge shaped, stem attaches to point whole leaf Narrowly triangular, widest on the opposite end from the stem, with the corners at that end rounded cuspidatus leaf tip With a sharp, elongated, rigid tip; tipped with a cusp , deltoideus whole leaf Shaped like the Greek letter delta; triangular with stem attached to side digitatus whole leaf A palmately compound leaf with leaflets, similar to palmate leaf tip Without a cirrus; antonym: cirrate ellipticus whole leaf Shaped like an ellipse (widest at mid blade and with similar convex tapering towards apex and base), with a short or no point emarginatus leaf tip Slightly indented at the tip ensiformis whole leaf Shaped like a sword; long and narrow with a sharp pointed tip falcatus whole leaf Sickle shaped fenestratus leaf surface features Large openings through the leaf; see perforate; sometimes used to describe leaf epidermal windows filiformis whole leaf Thread or filament shaped flabellatus whole leaf Semi circular or fan like hastatus whole leaf or base Spear shaped: pointed, with barbs, shaped like a spear point, with flaring pointed lobes at the base lacinatus whole leaf Very deeply lobed with the lobes being very drawn out and often making the leaf look somewhat like a branch or a pitchfork 3 D shape Flat (like most leaves) lanceolatus whole leaf Long, wider in the middle, shaped like a lance tip linearis whole leaf Long and very narrow like a blade of grass lobatus whole leaf Being divided by clefts; may be pinnately lobed or palmately lobed loratus whole leaf Having the form of a thong or strap lyratus whole leaf Shaped like a lyre, pinnately lobed leaf with an enlarged terminal lobe and smaller lateral lobes. See also List of lyrate plants. mucronatus leaf tip Ending abruptly in a small sharp point as a continuation of the midrib multi + findere whole leaf Cleft into many parts or lobes obcordatus whole leaf Heart shaped, stem attaches at the tapering end oblanceolatus whole leaf Much longer than wide and with the widest portion near the tip; reversed lanceolate leaf base Asymmetrical leaf base, with one side lower than the other oblongus whole leaf Having an elongated form with slightly parallel sides; roughly rectangular obovatus whole leaf Teardrop shaped, stem attaches to the tapering end; reversed ovate whole leaf Reversed trullate; the longer sides meet at the base rather than the apex. obtusus leaf tip or base Blunt, forming an angle > 90° orbicularis whole leaf Circular ovatus whole leaf Egg shaped, with a tapering point and the widest portion near the petiole palmatus whole leaf Palm shaped, i. e. with lobes or leaflets stemming from the leaf base palmatus whole leaf Lobes spread radially from a point palma + findere whole leaf Palm shaped, having lobes with incisions that extend less than halfway toward the petiole palma + partiri whole leaf Having palmate lobes with incisions that extend over halfway toward the petiole palma + secare whole leaf Having palmate lobes with incisions that extend almost up, but not quite to the petiole. panduratus whole leaf Fiddle shaped; obovate with a constriction near the middle. pedatus whole leaf Palmate, with cleft lobes peltatus stem attachment A round leaf where the petiole attaches near the center, e. g. a lotus leaf perfoliatus stem attachment With the leaf blade surrounding the stem such that the stem appears to pass through the leaf perforatus leaf surface features Many holes, or perforations, on leaf surface. Compare with fenestrate. pinna + lobus whole leaf Having lobes pinnately arranged on the central axis pinna + findere whole leaf Having lobes with incisions that extend less than halfway to the midrib pinnatus + partiri whole leaf Having lobes with incisions that extend more than halfway to the midrib pinnatus + sectus whole leaf Having lobes with incisions that extend almost to, or up to, the midrib plicatus 3 D shape Folded into pleats, usually lengthwise, serving the function of stiffening a large leaf reniformis whole leaf Shaped like a kidney, with an inward curve on one side leaf tip With a shallow notch in a round apex , rhomboidalis whole leaf Diamond shaped rotundifolius leaf tip or base Circular, no distinct point semiterete 3 D shape Rounded on one side and flat on the other sinuatus 3 D shape Circularly lobed leaves sagittatus whole leaf Arrowhead shaped with the lower lobes folded, or curled downward spathulatus whole leaf Spoon shaped; having a broad flat end which tapers to the base shaped hastatus whole leaf See hastate. subobtusus leaf tip or base Somewhat blunted; neither blunt nor sharp subulatus leaf tip Awl shaped with a tapering point 3 D shape Cylindrical with a circular or distorted circular cross section and a single surface wrapping around it with no grooves or ridges. Subterete means the leaves are not completely terete, as seen in various lichens and succulents. whole leaf Shaped like a masonry trowel truncatus leaf tip or base With a squared off end undulatus 3 D shape Wave like unifoliatus compound leaves With a single leaflet; it is distinct from a simple leaf by the presence of two abscission layers and often by petiolules and stipels.

The Latin word for 'leaf', folium, is neuter. In descriptions of a single leaf, the neuter singular ending of the adjective is used, e. g. folium lanceolatum 'lanceolate leaf', folium lineare 'linear leaf'. In descriptions of multiple leaves, the neuter plural is used, e. g. folia linearia 'linear leaves'. Descriptions commonly refer to the plant using the ablative singular or plural, e. g. foliis ovatis 'with ovate leaves'.