There's a rule that when we use a noun generically, we either put the definite article in front of it or use the plural form:
- The tiger is in danger of becoming extinct.
- Tigers are in danger of becoming extinct.
However, I applied this rule to plant names in one of my posts on Lang-8, and it didn't work. Here's a native speaker's correction; marked with an underscore is the place I had originally put the definite article.
In contrast, a compound called myrcene, abundant in _ dill and wild rosemary, was harder for bees to pick up.
I've already seen this omission before. You could google, for example, the Wikipedia article about garlic mustard — it doesn't use any articles in front of the species name.
Why is it so? Is there no article because it's considered a proper name of sorts? Why doesn't that work in the tiger example, then?