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The measurements and the observations of Liriodendron tulipifera L. in the central part of Polish Pomerania were conducted in the years 2002-2005. The height of the trees was measured with the use of Suunto heigh gauge, and the trunk perimeter with the aid of the tape measure in the height of 130 cm of the trunk length measured from the soil level. During researches we have found 9 new locations of yellow-poplar trees. The largest trunk perimeter – 330 cm, possesed the individual of it in Skoczów Kołobrzeski. The highest yellow-poplar tree was measured in Strzykocin. The tree reached the height of 27 m.
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Tulip tree in Poland's Pomerania

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The measurements and the observations of tulip tree in Pomerania region were conducted in years 2000 and 2004. The height of the trees was measured with the use of Suunto height gauge, and the trunk perimeter with the aid of tape measure in the height of 130 cm of the trunk length measured from the soil level. The general appearance, condition and wholesomeness of yellow-poplar trees, blossom and the presence of self-sown plants were observed. 37 tulip trees, in these 35 yellow-poplar trees, 2 Chinese tulip trees and one individual of yellow-poplar tree of variety – ‘Aureomarginatum’ were inventoried. The blossom and seed setting was observed on 29 trees and 2 of them produced self-sown plants. The highest yellow-poplar tree was measured in Przemysław. The tree reached the height of 44.5 m. The largest trunk perimeter – 367 cm, possessed the individual of yellow-poplar tree in Barzkowice. The legal protection in the form of recognizing the trees as tree natural monuments should be given to minimum of 13 of inventoried yellow-poplar trees. Old individuals of yellow-poplar trees growing in parks of Pomerania show full acclimatization. That fact is proved by the dimensions they reach and undergoing by them all stages of their development cycle.
The paper describes 11 new woody cultivars selected in Botanical Garden PAS in the years 1977-2009. The new cultivars include: seedlings of Picea pungens found in Podzamcze Nurseries with shoots and needles similar to Picea abies ‘Virgata’; plants selected from seedlings of Carpinus betulus ‘Pendula’ of very variable shapes, from depressed shrubby forms to tall trees with shapely pendant shoots; new yellow-leaved Thuja occidentalis with intensive colours and shape similar to Thuja occidentalis ‘Malonyana’ (it was selected from its seedling); a new form of delicately yellow-leaved Ginkgo biloba; and one cultivar of Liriodendron tulipifera with slightly conical, regular shape and strong growth habit.
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