一、每个蒲公英头状花序的花期为2-3天,在此期间它具有“昼开夜合”的现象,即花序白天张开,傍晚时分则连同外面的总苞一起向中心收拢。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/caef76094b36acaff064298e72d98d1001e99c38?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
二、一个头状花序中的所有花并非同时成熟,而是有先有后。外围花先熟,中心的花后熟,这是符合无限花序的一般特征的。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/1c950a7b02087bf48169e89bfcd3572c11dfcf3f?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
三、蒲公英的头状花序结束开花后,总苞不再张开,此后果实开始在紧闭的总苞中成熟。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/0bd162d9f2d3572c9e6423ae8413632762d0c33a?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
四、蒲公英的单个头状花序从开花结束到果实成熟,大约需要9天的时间,应该说还是非常迅速的。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/8718367adab44aed59e50196bd1c8701a18bfb1d?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
五、此后总苞再次也是最后一次张开,这时我们所熟悉的白色小绒球就出现了。这个小绒球由无数排列在花序托上的果实(瘦果)组成。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/c2fdfc039245d688e1310cd6aac27d1ed21b2494?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)