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whole leaf: Diamond-shaped rounded: rotundifolius: leaf tip or base: Circular, no distinct point semiterete: 3-D shape: Rounded on one side and flat on the other sagittate: sagittatus: whole leaf: Arrowhead-shaped with the lower lobes folded, or curled downward spatulate: spathulatus: whole leaf: Spoon-shaped; having a broad flat end which ...
Leaf Base Shape: Semiamplexicaul – the leaf base wraps around the stem, but not completely. Leaf Blade Apex: Acuminate – narrowing to a point (a term used for other structures, too). Acute – with a sharp, rather abrupt ending-point. Acutifolius – with acute leaves. Attenuate – tapering gradually to a narrow end. Leaf Blade Margins:
Narrowing gradually. See also Leaf shape. auricle An ear-shaped lobe, particularly a small, roundish, lateral appendage of a leaf or leaf-like organ. auriculate Attached at the base with ear-shaped appendages (auricle s). See also Leaf shape. autogamous Self-pollinating, self-fertilizing – in flowering plants awn 1. Any long, bristle-like ...
For instance, the parallel venation found in most monocots correlates with their elongated leaf shape and wide leaf base, while reticulate venation is seen in simple entire leaves, while digitate leaves typically have venation in which three or more primary veins diverge radially from a single point. [32] [25] [30] [33]
The leaf blade varies between almost round, ovate, or longish, diamond or inverted egg-shaped, 2–13 cm long, 1–7½ cm wide, with the base gradually narrowing, rounded or hart-shaped, the margin entire to scalloped, with shallow irregular teeth, saw-shaped or almost lobed, the leaf tip pointy, blunt or rounded and the teeth may be ending in ...
Variation in leaves from the giant ragweed illustrating positional effects. The lobed leaves come from the base of the plant, while the unlobed leaves come from the top of the plant. Although plants produce numerous copies of the same organ during their lives, not all copies of a particular organ will be identical.
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The leaf blades are lance-shaped to ovate, smooth-edged or toothed, hairless to rough-haired, and up to about 23 cm (9 in) long. [5] The inflorescence holds one to 15 flower heads . [ 6 ] The head is lined with 2 or 3 rows of phyllaries which are hairless or rough and sometimes glandular , and have rounded bases and pointed tips.