Handbook of Nature Study for Teachers And Pupils in Elementary Schools

Cover Handbook of Nature Study for Teachers And Pupils in Elementary Schools
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It has no milky juice. Another common form is the Swamp Milkweed, Asclepias incarnata, of wet places, and with bright purple flowers. Some milkweeds have greenish flowers, but all have their 198 HANDBOOK OF NATURE STUDY flowers constructed on the same plan, by which they can at once be recognized. What insects have you found on the flowers of milk- weeds ? How many of you have ever found caterpillars with black and yellow stripes on milkweeds ? They are the larvae of the large and very common M...onarch Butterfly. The seeds. Find by actual count how many flowers there are on one plant. You will find that only a few of these are fertilized and develop seeds. If you are a superficial observer, you will probably say, " Well, now, that intricate contrivance for insect-fertiliza- tion is not very successful after all"! " But if you will now take the trouble and also count the number of seeds in a pod, and remember that from two to six pods are produced on one plant, you will be compelled to admit that insect- fertilization in milkweeds is eminently successful.

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Handbook of Nature Study for Teachers And Pupils in Elementary Schools
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