Meicenheimer




Дата канвертавання22.04.2016
Памер7.46 Kb.
Chris Cruz

BOT 205


Meicenheimer

10/30/02


Homework #2
Magnolia grandiflora
It is native to the United States and has a range mainly concentrated in the southeastern portion of the country. The range also extends farther northeast due to naturalization. Distinguishing characteristics: It is a medium sized tree and is commonly 60 to 100 ft. tall. Leaves are dark green leathery, evergreen and are easily identified due to being very shiny. Leaves are usually 4 to 8 in. long and 2 ½ to 4 in. wide. The leaf shape is ovate with the margin entire. The underside of the leaf is rusty and tomentose. It has distinct aggregate follicles similar to those found in other native magnolias. The fruit is 2 to 4 in. long and ovoid in shape. Flowers are distinct with tight spirals of stamens and pistils. The flowers are 6 to 8 in. wide with 6 to 12 large petals, and the flowers are rather fragrant. The terminal buds are 1 to 1 ½ in. long and the bark is gray, smooth, and scaly. Its major use is as an ornamental because of its large showy flowers and dark leathery leaves. It is planted across North America as an ornamental. Other interesting facts include that it is Mississippi’s state tree and it is the state flower of Mississippi and Louisiana [1]. Information provided by Christopher Cruz, 2002.
[1] Textbook of Dendrology. 2001. Harlow and Harrar. McGraw-Hill Publishing.

Acer rubrum
It is native to eastern North America with a broad range spanning the eastern United States and southeastern Canada. The leaves are 2 ½ to 4 in. in diameter with an orbicular shape. The leaves have either 3 or 5 lobes with acute sinuses and the terminal lobe is usually convergent. The margins of the lobes are serrate and light green. Leaves turn into brilliant colors of red, orange, and yellow in autumn. The flowers are perfect and staminate, and they appear in early spring before the leaves appear. Flowers are red or yellow with the corolla present. The fruit are double samaras that are born in clusters. The samaras form an angle less the 90 degrees. The twigs are dark red and slender, and the buds are also red. The bark on older specimens has an appearance of breaking up into long, narrow, scaly plates that are separated by shallow fissures. It is a medium sized tree that grows rapidly and can grow to be 50 to 70 ft. tall. It is widely used as an ornamental and shade tree. It can tolerate a wide range of soil conditions. Fruits are often eaten by small animals, but they are poisonous to livestock. It is the state tree of Rhode Island [1]. Information provided by Christopher Cruz, 2002.
[1] Textbook of Dendrology. 2001. Harlow and Harrar. McGraw-Hill Publishing.

Crataegus phaenopyrum
It is native to Southern United States with a range from Virginia to Alabama in North America. The leaves are dark green and shiny when mature on the upper surface with a dull green underside. The leaves are alternate and broadly ovate, and they are about 2 in. long with three major lobes. The terminal lobe is much larger than the two basal lobes. The margins are doubly serrated and the leaves have a cordate base. The foliage color is burgundy to wine in autumn. The pome fruits are about a ¼ in. in diameter, are green, and they are in pendulous clusters. The fruits turn into an orange color in autumn. The fruit are an attractive red during winter [1]. The flowers are white and are about a ½ in. in diameter and they bloom in early June. The bloom time is short – 7 to 10 days [2]. The twigs are thin with small buds that are red-brown. The twigs are characterized by branched thorns. The thorniness of the twigs can vary from being lightly to densely thorny. It is very twiggy in appearance and constantly sheds small twigs. The trunk is either multi or single-trunked. The bark exfoliates into thin strips to reveal a red-orange interior bark below the gray outer bark [1]. It is often used as an all season ornamental tree used in landscaping [2]. Crataegus translates as "strength", referring to its wood strength. Phaenopyrum translates as "with the appearance of a pear", possibly referring to its pendulous branches when weighted down with ripe fruits, that somewhat resemble the strained appearance of pear tree branches (Pyrus communis) when fully loaded with ripe fruits [1]. Information provided by Christopher Cruz, 2002.

[1] http://www.hcs.ohio-state.edu/hcs/TMI/Plantlist/cr_pyrum.html



[2] http://www.hort.uconn.edu/plants/c/crapha/crapha1.html


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