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Leaves of most plants include a flat structure called the blade or lamina supported by a network of veins, a petiole and a leaf base; [1] but not all leaves are flat, some are cylindrical. [ citation needed ] Leaves may be simple, with a single leaf blade, or compound, with several leaflets .
In botany, a whorl or verticil is a whorled arrangement of leaves, sepals, petals, stamens, or carpels that radiate from a single point and surround or wrap around the stem or stalk. [ 1 ] [ 2 ] A leaf whorl consists of at least three elements; a pair of opposite leaves is not called a whorl.
The leaves are smooth, soft, linear in shape, 10–35 mm (0.4–1 in) long, and 1 mm (0.04 in) wide. They are also rich in oil with the glands prominent. Flowers occur in white or cream-colored masses of spikes 3–5 cm (1–2 in) long over a short period, mostly spring to early summer, and give the tree an appearance of looking fluffy.
Borers rarely bore tunnels in living trees, although when populations are high, adult beetles feed on tender twig bark, and may damage young living trees. One of the most common and widely distributed borer species in North America is the whitespotted sawyer ( Monochamus scutellatus ).
Lilium michiganense is a species of true lily commonly referred to as the Michigan lily. [3] It is a wildflower present in prairie habitats in the Great Lakes and Upper Mississippi Valley regions of the United States and Canada , from South Dakota through Ontario to New York , south to Georgia and Oklahoma .
Examples of trees with whorled phyllotaxis are Brabejum stellatifolium [4] and the related genus Macadamia. [5] A whorl can occur as a basal structure where all the leaves are attached at the base of the shoot and the internodes are small or nonexistent. A basal whorl with a large number of leaves spread out in a circle is called a rosette.
The leaves are simple, narrowly oblanceolate to linear, and borne in whorls of six to eight. [10] [11] [12] Cleavers have tiny, star-shaped, white to greenish flowers, which emerge from early spring to summer. The flowers are clustered in groups of two or three, and are borne out of the leaf axils. [13]
Drosera linearis is a herbaceous perennial with gland-tipped hairs covering long linear leaves. Plants form rosettes that are 6–15 cm wide. The stalks of the leaves are 5 mm wide and hairless. The leaf blades are linear-shaped, 1–6 cm long, and 1.5–3 mm wide with edges lined with hair-like glands.