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Leaf whorls on a herbaceous Lilium michiganense Leaf whorls on a woody tree, Brabejum stellatifolium. 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.
Leaves may also be whorled if several leaves arise, or appear to arise, from the same level (at the same node) on a stem. Veronicastrum virginicum has whorls of leaves separated by long internodes. With an opposite leaf arrangement, two leaves arise from the stem at the same level (at the same node), on opposite sides of the stem. An opposite ...
Principal growth stage 1: Leaf development (main shoot) 10: G, M: First true leaf emerged from coleoptile D: Cotyledons completely unfolded P: First leaves separated 11: First true leaf, leaf pair or whorl unfolded P: First leaves unfolded 12: 2 true leaves, leaf pairs or whorls unfolded 13: 3 true leaves, leaf pairs or whorls unfolded 1 .
The leaves are produced in whorls of six to twelve, each leaf 8–40 mm long, simple, or forked into two to eight thread-like segments edged with spiny teeth; they are stiff and brittle. It is monoecious, with separate male and female flowers produced on the same plant. The flowers are small, 2 mm long, with eight or more greenish-brown petals ...
Allocasuarina humilis is an erect or spreading, dioecious or monoecious shrub that typically grows to a height of 0.2–2 m (7.9 in – 6 ft 6.7 in). Its needle-like branchlets are more or less erect, up to 120 mm (4.7 in) long, the leaves reduced to scale-like teeth 0.4–0.5 mm (0.016–0.020 in) long, arranged in whorls of five to seven around the branchlets.
Floral sexuality is related to the presence or absence of the reproductive whorls: androecium and gynoecium. Flowers that have both whorls (i.e., will produce both male and female gametes) are said to be perfect, bisexual, monoclinous or, more frequently, hermaphrodites, as is the case with potato flowers (Solanum tuberosum, Solanaceae
Westringia longifolia is a small shrub that grows to 1–3 m (3 ft 3 in – 9 ft 10 in) high with a similar spread. The linear shaped green leaves are arranged in whorls of three, 12–35 mm (0.47–1.38 in) long, 1–2 mm (0.039–0.079 in) wide, more or less flat, margins smooth, both surfaces with occasional hairs or smooth, and the petiole 1–1.7 mm (0.039–0.067 in) long.
Allocasuarina pusilla is a spreading, dioecious shrub that typically grows to a height of 0.2–2 m (7.9 in – 6 ft 6.7 in) and has smooth bark. Its branchlets are erect to spreading, up to 120 mm (4.7 in) long, the leaves reduced to overlapping, scale-like teeth 0.3–0.5 mm (0.012–0.020 in) long, arranged in whorls of five to seven around the branchlets.
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