I am a bioinformatician working with plant data. Therefore my formation on plant biology and botany is "ok" but not very strong.

When people talk about sections, I know that they talk about a phylogenetic rank that is lower than the genus but higher than the species. It groups subsets of species belonging to a genus together.

What is the thing that puts them together? Morphology, origin, geography, metabolism, genome identity, ...?

  • $\begingroup$ It depends. Sometimes people use it because there is monophyletic group within the genus which share a particular character, but which they don't want to (or can't) segregate into its own genus. Usually you will find sections in large genera which contain quite a lot of morphological diversity. $\endgroup$ – NatWH Oct 12 '18 at 11:58
  • $\begingroup$ For more discussion on what makes a "good" name, see comments on this answer: biology.stackexchange.com/a/77519/42697 $\endgroup$ – NatWH Oct 12 '18 at 12:04

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