. Bulletin. Natural history; Natural history -- Montana. CROSS-FERTILIZATION OF PLANTS. 269 upon one of the graceful sepals and his weight is just sufficient to separ- ate it from the closely covering carpel. The bumble bee then wedges himself in between the slowly opening part and, by stretching his long tongue to its full length draws the nectar from its deep well. The true honey guides are on the upper surface of the petal. The cover is a style and bears the stigma on a shelf like projection just where the bee will rub his head and thorax in wedging himself in. The stamen rises and bears an
. Bulletin. Natural history; Natural history -- Montana. CROSS-FERTILIZATION OF PLANTS. 269 upon one of the graceful sepals and his weight is just sufficient to separ- ate it from the closely covering carpel. The bumble bee then wedges himself in between the slowly opening part and, by stretching his long tongue to its full length draws the nectar from its deep well. The true honey guides are on the upper surface of the petal. The cover is a style and bears the stigma on a shelf like projection just where the bee will rub his head and thorax in wedging himself in. The stamen rises and bears an anther at the point where it wil rub the pollen into the thoracic hairs of the bee. Why is not this same pollen left on the stigma when the bee backs out? If the stigma shelf is rubbed with the finger it opens. Fig. 30. outward as by a bee in entering, and closes when rubbed the opposite way. Thus the pollen gathered from this flower will be transferred to some other flower. The blue flag teaches us several lessons in adapta- tion. All of the irregular flowers are peculiarly shaped with reference to their insect visitors. They are a source of never ending speculation. Protective closure to keep out rain and unwelcome insects has been mentioned earlier. The hanging position of many flowers serves the same purpose. Many flowers have a movement of parts in addition to this closing, some of which are of great interest. My attention was first called to a closing of the lips of the stigma in the catalpa. Near the station, at Big Fork, is a swampy place where many interesting plants. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original University of Montana (Missoula); University of Montana (Missoula). Biological series. Missoula : University of Montana
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