Chinese Chives v. Garlic Chives

[Tweaked]

After doing some reading it seems Chinese chives and Garlic chives are terms that are used interchangeably.

Can someone tell me what the difference is between the two plants below?  To me they seem to be different, but when you google Chinese chives or Garlic chives both plants come up:

  

One has a little bulbous flower bud and the other does not.  Are these the same plant just at different stages of growth?

If a recipe calls for Chinese chives or Garlic chives can I use either?

Thanks knowledgeable DRers.

[DonRocks]

If a recipe calls for Chinese chives or Garlic chives can I use either? 

My guess is yes, and that they're both Allium Tuberosum. Even if there's some small difference, I can't imagine substituting one for the other harming a recipe.

[TheMatt]

Well, Wikipedia seems to say that allium tuberosum is called both Chinese chives and garlic chives, so you should be safe. Answered by Don!

And, yes, to me the one on the left looks like they were harvested before inflorescence.

My rule of thumb: hollow = chives, flat = Chinese chives.

[gnatharobed]

They are not used interchangeably in Chinese cooking. For example, a classic dumpling filling is pork with Chinese chives. You would use the flat kind, not the one with the bulb. Most Chinese grocery stores sell both.