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A hardiness zone is a geographic area defined as having a certain average annual minimum temperature, a factor relevant to the survival of many plants. In some systems other statistics are included in the calculations. The original and most widely used system, developed by the United States Department of Agriculture (USDA) as a rough guide for ...
Betula papyrifera is a medium-sized deciduous tree typically reaching 20 metres (66 feet) tall, [4] and exceptionally to 40 m (130 ft) with a trunk up to 75 centimetres (30 inches) in diameter. [9] Within forests, it often grows with a single trunk but when grown as a landscape tree it may develop multiple trunks or branch close to the ground.
Lake stratification is the tendency of lakes to form separate and distinct thermal layers during warm weather. Typically stratified lakes show three distinct layers: the epilimnion, comprising the top warm layer; the thermocline (or metalimnion), the middle layer, whose depth may change throughout the day; and the colder hypolimnion, extending to the floor of the lake.
The seeds will form pods encasing seeds just below the soil. The pods are round, wrinkled and each contains one or two seeds that are round, smooth and very hard when dried.The seeds may be cream colored, brown, red, mottled or black eyed and their size is about 8.5–15 mm × 6.5–10 mm × 5.5–9 mm. [ 19 ]
The fruit is a pair of samaras (winged seeds). The seeds are globose, 7–10 mm ( 9 ⁄ 32 – 13 ⁄ 32 in) in diameter, the wing 2–3 cm ( 3 ⁄ 4 – 1 + 1 ⁄ 4 in) long. The seeds fall from the tree in autumn, where they must be exposed to 45 days of temperatures below 4 °C (39 °F) to break their coating down.
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