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The leaves of both species are similar in outline and toothed and bristled very much the same way, but the leaves are brighter in the American holly and larger. [citation needed] The American holly, called the evergreen or Christmas holly (Ilex opaca Aiton) was named the state tree of Delaware on 1 May 1939. [19]
The mean annual increment (MAI) or mean annual growth refers to the average growth per year a tree or stand of trees has exhibited/experienced up to a specified age. For example, a 20-year-old tree that has a stem volume of 0.2 m 3 has an MAI of 0.01 m 3 /year.
Where: Y is the yield (volume, height, DBH, etc.) at times 1 and 2 and T 1 represents the year starting the growth period, and T 2 is the end year. Example: Say that the growth period is from age 5 to age 10, and the yield (height of the tree), is 14 feet at the beginning of the period and 34 feet at the end.
Hickories were in the white oak, sweet birch (Betula lenta), and American beech (Fagus grandifolia) growth-rate category. Dominant-codominant hickory trees grew about 3 mm (0.12 in) dbh per year compared to 5 mm (0.20 in) for the moderate-growth species (black cherry) and 6 mm (0.24 in) for the faster-growing species (yellow-poplar and red oak).
By contrast, the (roughly) 300-year-old Ice Glen pine in Stockbridge, Massachusetts shows approximately half the annual growth rate of trees in the 90- to 180-year age range, averaging just 5.8 cubic feet (0.16 m 3) per year over a five-year monitoring period. Volume increased as a result of increases in both height and girth.
This variable indicates the rate of biomass increase per unit leaf area, with typical values ranging from 5-15 g.m −2.day −1 for herbaceous species and 1-5 g.m −2.day −1 for woody seedlings. Although the ULR is not equal to the rate of photosynthesis per unit leaf area, both values are often well correlated. [7] [8]
Aquifoliaceae (holly family) Ilex opaca: American holly Aquifoliaceae (holly family) Ilex verticillata: common winterberry Aquifoliaceae (holly family) Ilex vomitoria: yaupon; yaupon holly Aquifoliaceae (holly family) Nemopanthus: false holly trees; Nemopanthus mucronatus: mountain holly; alpine holly Aquifoliaceae (holly family) Araliaceae ...
Ilex verticillata, the winterberry, is a species of holly native to eastern North America in the United States and southeast Canada, from Newfoundland west to Ontario and Minnesota, and south to Alabama. [3] [4] Other names that have been used include black alder, [5] [6] Canada holly, [5] coralberry, [6] fever bush, [7] Michigan holly, [6] or ...