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SI SessionSI Session

HandoutHandout

HerbariumDichotomous keys

Spring 2010

For Dr. Hughey’s Bio 3 ClassPicture from Pyeongsug’s Herbarrium, http://dj003.k12.sd.us/science%20labs/scientific%20naming/wacky_people_dichotomous.htm

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How to Identify plants?How to Identify plants?

1) Ask Botanist2) Find botany book and compare the

picture3) Use a dichotomous key4) Use the herbarium5) Genetics(DNA) analysis

Picture from The field trip Spring2009 http://www.flickr.com/photos/davis_boyz/3433538674/

Herbarium

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Picture from http://www.botany.hawaii.edu/BOT201/Algae/how_to_make_your_own_algal_herba.htm

Designed by Pyeongsug Kim, ©2009

How to Make Algal HerbariumHow to Make Algal Herbarium

Place the algae on a blotter (2) and cover them with cloth or muslin (3 - so that they stick only to paper) place another blotter (4) on top place corrugated cardboard spacers (1) on top & bottom to help dry your "sandwich".

Wacky People Key1. Two feet …………………………………21. Some other number of feet ………………3  2. Does not look at all human …………4 2. Looks a lot like a human ……………53. One leg …………………………………...63. Three or four legs ………………………..7 4. Fly-like ……………………Mosk Cara 4. Not fly-like ………………………….85. Seems to be a girl ……………………Rita Nita5. Not a girl………………………………….9 6. Leg is curled , two feet ………Ru-ela.Brella 6. Leg is straight, one foot………Giggles7. Three legs ……………………………….107. Four legs ………………………………..11 8. Has webbed feet ………………Hex Oculate 8. Clawed feet ………………………….129. Curly hair, no toes ………………..Lugio Wirum9. Wiggly looking mouth, three toes on feet…..C. Nile 10. Very long nose, open mouth ………….Elle E. Funk 10. Some other appearance ……………….1311. Has duck bill, two pinchers ………………..Tri D. Duckt11. No arms or pinchers ……………………….14 12. Has ears, tail, and beak ………………..Grif Leon 12. Four eyes on stalks ……………………Eggur Ondy13. One eye, webbed feet ……………………...Cue Kide13. Four stalked eyes, four pinchers …………..Quadrumenox 14. Three toed feet, nose like a flower ……Tunia petalos 14. Spider-like, has spots …………Patterned mulywumpus

From http://dj003.k12.sd.us/science%20labs/scientific%20naming/wacky_people_dichotomous.htm

Just joke! Please, don’t take seriously..

Designed by Pyeongsug Kim, ©2009

Dichotomus Keys:a tool that allows the user to determine the identity of items.

In constructing keys, keep the following in mind:

•Use constant characteristics rather than variable ones. •Use measurements rather than terms like "large" and "small". •Use characteristics that are generally available to the user of

the key rather than seasonal characteristics or those seen only

in the field. •Make the choice a positive one - something "is" instead of "is

not". •If possible, start both choices of a pair with the same word. •If possible, start different pairs of choices with different words. •Precede the descriptive terms with the name of the part to

which they apply.

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Dichotomus Keys

1. Edges grated ……..2 1. Edges smooth ……..3

2. Diameter 24.26 mm ……. 25 ¢2. Diameter 17.91 mm ……. 10 ¢

3. Color brown ……. 1 ¢3. Color silver ……. 5 ¢

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Dichotomus Keys

1. Size largest …….. 25 ¢1. Size smallest ……..10 ¢

1. Diameter 24.26 mm ……. 25 ¢1. Diameter 17.91 mm ……. 10 ¢

Please, Don’t…..

Use measurements rather than terms like "large" and "small".

2. Diameter 17.91 mm ……. 10 ¢2. Color brown ……. 1 ¢

Use same traits

2. Color silver ……. 10 ¢2. Color brown ……. 1 ¢

Dichotomus Keys

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http://www.dnr.state.wi.us/org/caer/ce/eek/veg/treekey/index.htm

Try it! so fun!

Juglans nigra

Dichotomus Keys

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2. Outline of leaf oval-shaped  ...........____2. Outline of blade star-shaped  .........____

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1. Leaves flat ---------------------------------- 21. Leaves needle-like or scale-like ------ 3

A

http://kirbypl.wilkes.edu/needle.html

DB C

3. Length of leaf more than 1cm long ---------- 43. Length of leaf less than 0.5 cm long ---------- _____

E

4. Blades arranged in cluster ------------------------ _____4. Blades scattered or alternated--------------------_____

BC

D

EA