What is 夜来香 in the song by Teresa Teng? Cross-post notice

Since it has been 25 days since I posted this on Quora, and all that happened was it was marked as needing editing (and perhaps also as needing to be in English), I chose to cross-post here.

Question

The question text on Quora


  On Chinese Wikipedia, “夜来香” is mapped to some 5 different plants (see source). Which of those four is Teresa Teng's song referring to?


The source comment


  Wikipedia link: 夜来香 (歌曲) - 维基百科，自由的百科全书
  
  Options therein given for Yelaixiang:
  
  
  Cestrum nocturnum (aka night-blooming jasmine, the one I suspect the song is referring to);
  葉香木 (what is that?) ;
  Polianthes tuberosa;
  Telosma cordata;
  Oenothera biennis.
  
  
  The song:https://youtu.be/t_-ljVn6oLI


So what plant is this Yèláixiāng? Is it the night-blooming jasmine (cestrum nocturnum), as I suspect, or one of the other 4? And what is 葉香木?

Update

The Japanese version of the song calls the Yelaixiang:


  夜来香白い花 | Yeraishan shiroi hana | Yelaixiang white flower


Of the above, number 4 is a yellow flower, and so is number 5. Baidu gives the following image for number 2:



So number 2 isn't even a flower. That leaves us with number 1 (Cestrum nocturnum aka night-blooming jasmine) and number 3 (Polianthes tuberosa).
the book 小山畫譜 has an entry "夜來香":


  藤本﹒植必用架蔓延環繞﹒葉長而末圓﹒花一叢百朶﹒五出﹒色綠微黄﹒蒂托管有柄﹒開亦下垂﹒日落則香氣襲人﹒六七月開




in the 5 wiki entries, only the centrum nocturnum (夜香木)  matched the above description ("花一叢百朶" "色綠微黄" "開亦下垂")



so, i would suggest option 1 (centrum nocturnal) as the answer.