Friday, July 25, 2008

Islands Vegetation

Staghorn Sumac (Rhus typhina, synonym: R. hirta), is a deciduous shrub to small tree in the Anacardiaceae or Cashew family, native to eastern North America It is primarily found in the Northeastern and Midwestern United States, Southern Ontario, and the Appalachian Mountains. [1]
It grows to 3-10 m tall, and has alternate, pinnately compound leaves 25-55 cm long, each with 9-31 serrate leaflets 6-11 cm long [2]. The leaf petioles and the stems are densely covered in rust-colored hairs.
The
fruit of staghorn sumac is one of the most identifiable characteristics, forming dense clusters of small red drupes at the terminal end of the branches [2]; the clusters are conic, 10-20 cm long and 4-6 cm broad at the base. The plant flowers from May to July and fruit ripens from June to September. [2] The foliage turns a brilliant red in autumn. The fruit has been known to last through winter and into spring.
Staghorn sumac spreads using its seeds, and by spreading
rhizomes. This makes it so the tree forms colonies, with the oldest plants in the center, and the younger plants radiating out [2]. It grows quite aggressively.
The Black Cherry (Prunus serotina, also occasionally Wild Black Cherry, Rum Cherry, or Mountain Black Cherry) is a species of cherry, native to eastern North America from southern Quebec and Ontario south to Texas and central Florida, with disjunct populations in Arizona and New Mexico, and in the mountains of Mexico and Guatemala.[1][2]

Immature fruit
It is a species in the subgenus
Padus with flowers in racemes, and is a deciduous tree growing to 15-30 m tall with a trunk diameter of up to 70-120 cm, occasionally more. The leaves are simple, 6-14 cm long, with a serrated margin. The flowers are small (10-15 mm diameter), with five white petals and about 20 stamens, and are fragrant; there are around 40 flowers on each raceme. The fruit is a drupe, 1 cm diameter, green to red at first, ripening black; it is usually astringent and bitter to eat fresh, but sometimes sweet. The fruit is readily eaten by birds, which do not taste astringency as unpleasant.[3][1]
Mature Black Cherry can easily be identified in a forest by its very broken, dark grey to black bark, which has the appearance of very thick, burnt potato chips. However, for about the first decade or so of its life, the bark resembles that of a Birch, and is thin and striped. It can also quickly be identified by its long, shiny leaves resembling that of a Sourwood, and by an almond-like odor when a young twig is scratched and held close to the nose.
The Chokecherry (Prunus virginiana) is a species of bird cherry (Prunus subgenus Padus) native to North America, where it is found almost throughout the continent except for the deep south and the far north. It is a suckering shrub or small tree growing to 5 m tall. The leaves are oval, 3-10 cm long, with a coarsely serrated margin. The flowers are produced in racemes of 15-30 in late spring (well after leaf emergence). The fruit are about 1 cm diameter, bright red, with a very astringent, sour taste. Like chokeberries, chokecherries are very high in antioxidant pigment compounds, like anthocyanins.
There are two varieties:
Common Chokecherry Prunus virginiana var. virginiana. Eastern North America. Leaves hairless underneath or downy only in the vein axils.
Western Chokecherry Prunus virginiana var. demissa. Western North America. Leaves downy underneath.
The apple is the pomaceous fruit of the apple tree, species Malus domestica in the rose family Rosaceae. It is one of the most widely cultivated tree fruits. The tree is small and deciduous, reaching 5 to 12 m tall, with a broad, often densely twiggy crown.[1] The leaves are alternately arranged simple ovals 5 to 12 cm long and 3–6 cm broad on a 2–5 cm petiole with an acute tip, serrated margin and a slightly downy underside. Flowers are produced in spring simultaneous with the budding of the leaves. The flowers are white with a pink tinge that gradually fades, five petaled, 2.5–3.5 cm in diameter. The fruit matures in autumn, and is typically 5–9 cm diameter. The centre of the fruit contains five carpels arranged in a five-point star, each carpel containing one to three seeds.[1]
The tree originated from Central Asia, where its wild ancestor is still found today. There are more than 7,500 known cultivars of apples resulting in range of desired characteristics. It should be noted however, that cultivars vary in their yield and the ultimate size of the tree, even when grown on the same rootstock.[2]
At least 55 million tonnes of apples were grown worldwide in 2005, with a value of about $10 billion. China produced about two-fifths of this total. The United States is the second leading producer, with more than 7.5% of the world production.[3] Turkey, France, Italy and Iran are among the leading apple exporters
Betula populifolia (Gray Birch) is a deciduous tree native to North America. It ranges from southeastern Ontario east to Nova Scotia, and south to Pennsylvania and New Jersey. It also has disjunct populations in Indiana, Virginia, and North Carolina. It prefers poor, dry upland soils, but is also found in moist mixed woodlands. It is a common pioneer species on abandoned fields and burned areas, but is short-lived.
It grows quickly to 9 m tall and 0.3 m trunk diameter, with an irregular open crown of slender branches. The tree often has multiple trunks branching off of an old stump. The
leaves are 5-7.5 cm long by 4-6 cm wide, alternately arranged, ovate, and tapering to an elongated tip. They are dark green and glabrous above and paler below, with a coarsely serrated margin. The bark is chalky to grayish white with black triangular patches where branch meets trunk. It is smooth and thin but does not readily exfoliate. The flowers are wind-pollinated catkins 5-8 cm long, the male catkins pendulous and the female catkins erect. The fruit, maturing in autumn, is composed of many tiny winged seeds packed between the catkin bracts.

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