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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]
This tree grows 10–25 m (33–82 ft) tall, with large heart-shaped to five-lobed leaves 15–40 cm (6–16 in) across, arranged in opposite pairs on the stem. On young growth, the leaves may be in whorls of three and be much bigger than the leaves on more mature growth. [13] The leaves can be mistaken for those of the catalpa.
The upper surface of the leaf is a shiny deep green, and the lower is yellowish-brown. There are also stellate hairs on the underside of the leaf that grow in clumps. [5] Some key characteristics for identification include that leaves grown in the sun have very deep U-shaped sinuses and that the buds are velvety and covered in white hairs. [5] [6]
Leaves. Bursera simaruba is a small to medium-sized tree growing to 30 meters tall, with a diameter of one meter or less at 1.5 meters above ground. [5] The bark is shiny dark red, and the leaves are spirally arranged and pinnate with 7-11 leaflets, each leaflet broad ovate, 4–10 cm long and 2–5 cm broad. [6] Gumbo-limbo is semi-evergreen. [7]
A leaf (pl.: leaves) is a principal appendage of the stem of a vascular plant, [1] usually borne laterally above ground and specialized for photosynthesis.Leaves are collectively called foliage, as in "autumn foliage", [2] [3] while the leaves, stem, flower, and fruit collectively form the shoot system. [4]
Simple leaves are also occasionally present; technically, these are single-leaflet compound leaves. Although some other maples (such as Acer griseum, Acer mandshuricum and the closely related A. cissifolium) have trifoliate leaves, only A. negundo regularly displays more than three leaflets.
Some trees play a tune, using vines for harp strings and a chorus of robins. A fight breaks out between a waspish-looking hollow tree and a younger, healthier tree for the attention of a female tree. The young tree emerges victorious, but the hollow tree retaliates by starting a fire. The plants and animals try to extinguish or evade the blaze.
In autumn, leaves turn various shades of yellow, orange and red. Hornbeam saplings, stressed trees, and the lower branches of mature trees may exhibit marcescence—where leaves wither with autumn but abscission (leafdrop) is delayed until spring. [4] The smooth, gray trunk and larger branches of a mature tree exhibit a distinctive muscle-like ...