The insect _visits the flower for the nectar_ (for the making of honey) _and may unknowingly carry the pollen_. Spurs and sacs in the flower are nectaries (Fig. 200), but in spurless flowers the nectar is usually secreted _in the bottom of the flower cup_. This compels the insect to pass by the anther and rub against the pollen before it reaches the nectar. Sometimes the anther is a long lever poised on the middle point and the insect bumps against one end and lifts it, thus bringing the other end of the lever with the pollen sacs down on its back. Flowers that are pollinated by insects are said to be =entomophilous= (“insect loving”). Fig. 200 shows a larkspur. The envelopes are separated in Fig. 201. The long spur at once suggests insect pollination. The spur is a sepal. Two hollow petals project into this spur, apparently serving to guide the bee’s tongue. The two smaller petals, in front, are peculiarly colored and perhaps serve the bee in locating the nectary. The stamens ensheath the pistils (Fig. 202). As the insect stands on the flower and thrusts its head into the center, the envelopes are pushed downward and outward and the pistil and stamens come in contact with its abdomen. Since the flower is proterandrous, the pollen that the pistils receive from the bee’s abdomen must come from another flower. Note a somewhat similar arrangement in the toadflax or butter-and-eggs. [Illustration: FIG. 202.--STAMENS OF LARKSPUR, surrounding the pistils.] In some cases (Fig. 203) the stamens are longer than the pistil in one flower and shorter in another. If the insect visits such flowers, it gets pollen on its head from the long-stamen flower, and deposits this pollen on the stigma in the long-pistil flower. Such flowers are =dimorphous= (of two forms). If pollen from its own flower and from another flower both fall on the stigma, the probabilities are that the stigma will choose the foreign pollen. [Illustration: FIG. 203.--DIMORPHIC FLOWERS OF PRIMROSE.] _Many flowers are pollinated by the wind._ They are said to be =anemophilous= (“wind loving”). Such flowers produce great quantities of pollen, for much of it is wasted. They usually have broad stigmas, which expose large surfaces to the wind. They are usually lacking in gaudy colors and in perfume. Grasses and pine trees are typical examples of anemophilous plants. [Illustration: FIG. 204.--FLOWERS OF BLACK WALNUT: two pistillate flowers at _A_, and staminate catkins at _B_.]