Rhododendron Essay
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Rhododendron
The plant rhododendron belongs to the family
Ericaceae which also includes the Heath, and there are
about eight-hundred fifty species which grow worldwide
(Turner and Szczawinski, 171-2). The Heath family is a
large one with so many species, all of the poisonous
species fall into two of its subfamilies, one of which is
the rhododendron.
These cultivated plants occur naturally in temperate
regions of the northern hemisphere and in the mountains of
Southeast Asia. They are located in the Himalayas with
seven-hundred species, southwest China, Burma, and in New
Guinea with over three-hundred species (Turner and
szczawinski, 172). It has been popular as ornaments in
gardens and has led to a major horticultural industry with
its widely uses in landscaping.
There are twenty-seven species native to North
America, (Turner,172) and is the state plant of
Washington. This specific plant is called R. macrophyllum
or the Pacific rhododendron (Pojar and Mackinnon, 61). It
forms a shrub layer in forests ranging from shoreline pine
groves to stands of Douglas-fir and western Hemlock up in
the mountains. Usually they are located everywhere from
homes to freeway sides and also in the forests.
The rhododendron shows a great variety in size,
habit, and flower color, colors from white to pink,
dark-purple, yellow, red, and orange (McKenzi,1). They
range from small shrubs to small trees with evergreen
leaves that are leathery. The leaves are short stalked,
simple, and alternate, and the flowers are large,
bell-shaped, and born in dense clusters. They are best
grown on acidous soil with a ph of 4.5 and 6.5, included
with lots of moisture and organic material (McKenzie, 3).
The leaves, flowers, pollen, and nectar of many
rhododendron species contain several toxins (Kingsbury,
50). These toxins are called grayanotoxins or
andromedotoxin, a resinoid carbohydrate (Kingsbury, 51).
It is prevalent in the flower nectar, and has caused
poisoning of bees and the honey produced. The symptoms
are similar to both humans and all animals. The human
cases are that in which children...
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