Leaf Shape:
Acuminate - slowly tapering in to a point
Convolute - rolled up along the long axis
Cordate -(Latin "heart")  leaf that is heart shaped at the base,
Elliptical / Elliptic - leaf oval in shape, narrow at ends
Filliform - much, much longer than wide with narrow tapering ends, threadlike
Lance shaped / lanceolate - longer than broad wider at the base, narrower at the tip
Oblique - leaves with different halves, not meeting evenly at the base
Oblong - several times longer than wide
Obovate - narrows at the base of leaf, wider at the tip
Orbicular - circular shaped leaf
Ovate - -wide at base, tapering at leaf tip
 

Leaf Arrangements:
Alternate - leaves arranged in a staggered formation along the plant stem, compare to alternate
Clasping - leaf base surrounds the stem but not perfoliate (see below)
Perfoliate - leaf encircles the stem
Opposite  - leaves attached directly across from each other on either side of the stem
Sessile - attached directly to stem, lacking a petiole
3-ranked - leaves staggered in a tier of three
Whorled - leaves parts forming a ring around a central axis (stem); forming a circle

Leaf Edges/Margins:
Crenulations / crenate - rounded teeth
Dentate - toothed leaf margin
Entire - no division in the leaf from teeth, notches etc.
Lobed - portion of leaf that is cut in, may be round or angular
Margins - the edges of the leaf
Serrate - toothed margin may be sharp or rounded
Undulations - margin that is wavy

Leaf Parts:
Axil -  the intersection of the leaf and the stem
Blade - widest part of leaf or petal
Frond - leaf of a fern
Inrolled - an organ that rolls until it curls over on itself
Nerve - a prominent, obvious vein of a leaf
Phyllode - a petiole of a leaf that is very expanded and lacks a blade
Pinnae / Pinna - leaflet of a pinnate leaf
Petiole - stalk of a leaf
Sinuses - the recessed portion of a lobe
Vascular Bundle - tissue (carrying water / nutrients) in plants in a cluster often making it visible
Vein - a vascular bundle in the leaf visible to the naked eye

Leaf Types:
Bipinnate - leaf has two divisions FIG
Deciduous - leaves that are shed periodically in contrast to evergreen
Compound - leaf is separated into leaflets
Palmate - leaves are arranged radially from a common axis point
Pellucid - transparent / translucent
Pinnate compound - leaflets are opposite on a common axis FIG
Simple - leaf is NOT separated into leaflets, single blade attached to petiole
Trifoliate - 3 leaflets per leaf or having 3 leaves