Plant Taxonomy and
Horticulture and the
What is a Scientific
Names and How are Plants Given Scientific Names
How to Write a
Sansevieria trifasciata or Sansevieria trifasciata
How are Plants
Given Common Names
1) Read BOTH contrasting statements (couplet) completely. Even if the first choice sounds correct, the second may be more correct.
2) If a term is unfamiliar, look up its definition - DO NOT GUESS!
3) Make measurements with a ruler - DO NOT GUESS!
4) Nature is highly variable, look at several samples before deciding. NEVER rely on just one sample.
5) If in doubt about a choice, follow it both ways, then choose between the final choices.
TAKE HOME LESSONS
1) To learn what a is a scientific name.
2) To learn how to write a scientific name.
3) To learn how to use a key to identify the name of a plant.
4) To learn how to make a key.
Sansevieria to key out.
A bag of various kinds and shapes of leaves and stems to use to make a key.
The class will practice writing scientific names.
How to use a key to identify the name of a plant.
The class will use the Key to Sansevieria to key-out and identify the name of several Sansevieria species.
How to make a Key
The students will break up into groups of 3. Your instructor will supply you with a bag containing a dozen or so different kinds of plants. Working in groups of 3-4, you are to construct a key that can be used to identify the samples. Constructing your own key is an excellent way of learning how to use them and learning the disadvantages or pitfalls of using keys. The following guidelines will be helpful in constructing the key.
1) Study the key to Sansevieria to become familiar with the physical layout and numbering system. These are called indented keys. Each statement of the couplet is preceded by the same number and/or is at the same level of indentation, and may be physically separated. Each statement of the couplet either identifies the unknown or leads to another couplet until the statement ends in a name.
2) The key must be based on constant characteristics if it is to be useful. To start the key, separate the plant samples into two piles based on the highest characteristic (i.e. leaves needle or scale-like vs. leaves broad), then separate each pile based on another distinquishing characteristic. Write the key based on these statements used to separate the piles..
3) Start the contrasting statements of each couplet with the same word (capitalize only the first word), preferably a noun followed by adjectives. For example:
1) Leaves needle-like or scale-like
1) Leaves broad
4) When you have separated a plant into a 1-plant pile, then write the plant name at the end of the line.
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