The flower and the bee; plant life and pollination . Fig. 7. Yellow Birch. Betiila luteaA, fertile catkins; B, staminate catkins. A wind-pollinated tree THE FLOWER AND THE BEE different flowers and flower-clusters either on the same tree oron different trees. The fertile flowers are also higher up onthe branch than the sterile. Even in the elm a part of theflowers are unisexual. The stigmas are in a receptive condi-tion two or three, or even four or five, days before the anthersopen, or sometimes the anthers may mature before the pistillate flowers, whether solitary or in clusters,
The flower and the bee; plant life and pollination . Fig. 7. Yellow Birch. Betiila luteaA, fertile catkins; B, staminate catkins. A wind-pollinated tree THE FLOWER AND THE BEE different flowers and flower-clusters either on the same tree oron different trees. The fertile flowers are also higher up onthe branch than the sterile. Even in the elm a part of theflowers are unisexual. The stigmas are in a receptive condi-tion two or three, or even four or five, days before the anthersopen, or sometimes the anthers may mature before the pistillate flowers, whether solitary or in clusters, are nearlyrigid and motionless, since it would be of no benefit, if not anactual disadv^antage, for them to oscillate in the breeze; butthere is always provision for shaking the anthers. This inmost instances is very effectively accomplished by the pendu-lous catkin; but in the beech the drooping head of staminateflowers on a long stem sways easily to and fro in the ^\ind,while in the elm the stamens double in length after the flower-buds expand,
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