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Aerenchyma or aeriferous parenchyma [ 1] or lacunae, is a modification of the parenchyma to form a spongy tissue that creates spaces or air channels in the leaves, stems and roots of some plants, which allows exchange of gases between the shoot and the root. [ 2] The channels of air-filled cavities (see image to right) provide a low-resistance ...
Salix alba 'Vitellina' ( golden willow; syn. Salix alba var. vitellina (L.) Stokes) is a cultivar grown in gardens for its shoots, which are golden-yellow for one to two years before turning brown. It is particularly decorative in winter; the best effect is achieved by coppicing it every two to three years to stimulate the production of longer ...
Salix tetrasperma, commonly called Indian willow, is a medium-sized tree of wet and swampy places, shedding its leaves at the end of monsoon season. It flowers after leafing. The bark is rough, with deep, vertical fissures and the young shoots leaves are silky. The leaves are lance-like, or ovate-lancelike, 8–15 cm long, with minutely and ...
As the main shoot develops from the tuber, the base of the shoot close to the tuber produces adventitious roots and lateral buds on the shoot. The shoot also produces stolons that are long etiolated stems. The stolon elongates during long days with the presence of high auxins levels that prevent root growth off of the stolon. Before new tuber ...
Wattle (construction) A wattle fence at an outdoor museum in Poland. Wattle hurdle or panel. A wattle hurdle being constructed on a frame. Wattle is made by weaving flexible branches around upright stakes to form a woven lattice. The wattle may be made into an individual panel, commonly called a hurdle, or it may be formed into a continuous ...
Description. Salix nigra is a medium-sized deciduous tree, the largest North American species of willow, growing to 10–30 m (35–100 ft) tall, exceptionally up to 45 m (148 ft), with a trunk 50–80 centimeters (20–30 in) diameter. The bark is dark brown to blackish, becoming fissured in older trees, and frequently forking near the base. [ 3]
As the plant embryo grows at germination, it sends out a shoot called a radicle that becomes the primary root, and then penetrates down into the soil.After emergence of the radicle, the hypocotyl emerges and lifts the growing tip (usually including the seed coat) above the ground, bearing the embryonic leaves (called cotyledons), and the plumule that gives rise to the first true leaves.
The most common is S. caprea 'Kilmarnock', discovered by James Smith, with stiffly pendulous shoots forming a mop-head; it is a male clone. A similar female clone is S. caprea 'Weeping Sally'. As they do not form a leader, they are grafted on erect stems of other willows; the height of these cultivars is determined by the height at which the ...