Designed by Pyeongsug Kim ©2010 SI Session Handout Herbarium Dichotomous keys Spring 2010 For Dr. Hughey’s Bio 3 Class Picture from Pyeongsug’s Herbarrium, _dichotomous.htm _dichotomous.htm

Designed by Pyeongsug Kim, ©2009 How to Identify plants? 1)Ask Botanist 2)Find botany book and compare the picture 3)Use a dichotomous key 4)Use the herbarium 5)Genetics(DNA) analysis Picture from The field trip Spring2009

Herbarium Designed by Pyeongsug Kim, ©2009

Picture from Designed by Pyeongsug Kim, ©2009 How 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 Key 1. Two feet …………………………………2 1. Some other number of feet ………………3 2. Does not look at all human …………4 2. Looks a lot like a human ……………5 3. One leg ………………………………… Three or four legs ……………………… Fly-like ……………………Mosk Cara 4. Not fly-like ………………………….8 5. Seems to be a girl ……………………Rita Nita 5. Not a girl………………………………….9 6. Leg is curled, two feet ………Ru-ela.Brella 6. Leg is straight, one foot………Giggles 7. Three legs ……………………………… Four legs ……………………………… Has webbed feet ………………Hex Oculate 8. Clawed feet ………………………… Curly hair, no toes ………………..Lugio Wirum 9. Wiggly looking mouth, three toes on feet…..C. Nile 10. Very long nose, open mouth ………….Elle E. Funk 10. Some other appearance ……………… Has duck bill, two pinchers ………………..Tri D. Duckt 11. No arms or pinchers ……………………… Has ears, tail, and beak ………………..Grif Leon 12. Four eyes on stalks ……………………Eggur Ondy 13. One eye, webbed feet ……………………...Cue Kide 13. Four stalked eyes, four pinchers …………..Quadrumenox 14. Three toed feet, nose like a flower ……Tunia petalos 14. Spider-like, has spots …………Patterned mulywumpus From 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.

Designed by Pyeongsug Kim, ©2009 Dichotomus Keys 1.Edges grated …… Edges smooth …… Diameter mm ……. 25 ¢ 2. Diameter mm ……. 10 ¢ 3. Color brown ……. 1 ¢ 3. Color silver ……. 5 ¢

Designed by Pyeongsug Kim, ©2009 Dichotomus Keys 1.Size largest …….. 25 ¢ 1. Size smallest ……..10 ¢ 1. Diameter mm ……. 25 ¢ 1. Diameter mm ……. 10 ¢ Please, Don’t….. Use measurements rather than terms like "large" and "small". 2. Diameter mm ……. 10 ¢ 2. Color brown ……. 1 ¢ Use same traits 2. Color silver ……. 10 ¢ 2. Color brown ……. 1 ¢

Dichotomus Keys Designed by Pyeongsug Kim, © Try it! so fun! Juglans nigra

Dichotomus Keys Designed by Pyeongsug Kim, ©2009

2. Outline of leaf oval-shaped ____ 2. Outline of blade star-shaped ____ Designed by Pyeongsug Kim, © Leaves flat Leaves needle-like or scale-like A D B C 3. Length of leaf more than 1cm long Length of leaf less than 0.5 cm long _____ E 4. Blades arranged in cluster _____ 4. Blades scattered or alternated _____ B C D E A