花粉

• It is obvious that the amount of background pollination will reflect the size of any local source .
  显然外来传粉的数量可以反映当地花粉源的大小。
• The style is elongated, ending in a small, capitate stigma, which becomes receptive at bloom .
  长柱延伸，其末端有一小的头状柱头，开花时接受花粉。
• However, pollen insect-pollinated (entomophilous)species is also often transported by wind .
  然而，虫媒传粉（虫媒植物）种的花粉也常常由风来输送。
• The total amount of pollen was measured more accurately by 30 millimetre deameter globes .
  用直径30毫米的球形收集器，可以更准确地测定花粉的总量。
• The stickness causes the pollen to adhere to the legs and bodies of insects which visit the flowers .
  当昆虫落到花上，花粉粘附在昆虫的腿上和身体上。
• Sewall wnight thought it desirable to weight each observation directly as the pollen frequency .
  赛沃尔劳埃特认为把每次观测直接加权作为花粉频率是可取的。
• The pollen can then be separated from the rest of the catkin by sieving through cheesecloth or fine screen .
  以粗纱布或细筛过筛，便可将花粉同雄花序的其它部分分开。
• If the conelet scales have grown shut or the stigma have withered, receptivity is probably past .
  假如小球果的鳞片已闭合或柱头已凋萎，则表明已经没有接受花粉的能力。
• In order to obtain factual information about self-fertilization, empirical measurements must be made .
  为了得到关于自传花粉的确实资料，必须采用一些已行之有效的方法。