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Chart illustrating leaf morphology terms. The following terms are used to describe leaf morphology in the description and taxonomy of plants. Leaves may be simple (that is, the leaf blade or 'lamina' is undivided) or compound (that is, the leaf blade is divided into two or more leaflets). [1]
With an alternate (spiral) pattern, each leaf arises at a different point (node) on the stem. Distichous leaf arrangement in Clivia Distichous phyllotaxis, also called "two-ranked leaf arrangement" is a special case of either opposite or alternate leaf arrangement where the leaves on a stem are arranged in two vertical columns on opposite sides ...
Whorled leaf pattern of the American tiger lily. Perennial plants whose leaves are shed annually are said to have deciduous leaves, while leaves that remain through winter are evergreens. Leaves attached to stems by stalks (known as petioles) are called petiolate, and if attached directly to the stem with no petiole they are called sessile. [19]
The ERDL pattern, also known as the Leaf pattern, [2] is a camouflage pattern developed by the United States Army at its Engineer Research & Development Laboratories (ERDL) in 1948. [ 3 ] [ 4 ] It was not used until the Vietnam War , when it was issued to elite reconnaissance and special operations units beginning early 1967.
Curling acanthus-type leaves occur frequently in the borders and ornamented initial letters of illuminated manuscripts, and are commonly found in combination with palmettes in woven silk textiles. In the Renaissance classical models were followed closely, and the acanthus becomes recognisable again in large-scale architectural examples. The ...
Maple leaf updated to match File:Flag of Canada (construction sheet - leaf geometry).svg. Nominal dimensions changed to 630 × 655. Attempted to maintain small amount of padding around left, top, and right of the leaf as per original file. Leaf properly centered within image. 07:23, 28 July 2008: 3,700 × 4,000 (4 KB) Brochon99
The leaves take two forms. Submersed leaves are up to 20 centimeters long by 7 wide and may be folded along their midribs. The submersed leaves have more veins than do those of other pondweed species, up to 49. [1] Floating leaves are up to 10 centimeters long by 5 wide, leathery in texture, and borne on long petioles.
They are large, deciduous trees that are 15–30 m (50–100 ft) tall and diameters of 4 m (13 ft), [2] distinguished by thick, deeply fissured bark and triangular-based to diamond-shaped leaves that are green on both sides (without the whitish wax on the undersides) and without any obvious balsam scent in spring.