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taxonomic confusion w/less common brassicas

Posted by cousinfloyd NC 7 (My Page) on
Wed, Jan 15, 14 at 10:48

Territorial seed lists red Russian and dwarf Siberian kales as B. oleracea, but Southern Exposure lists them both as B. napus. Which are they (and are the two even the same species)?

And what about Mizuna? Southern Exposure lists it as B. rapa. Will it really cross with turnips but not with other mustards?

What about the kind of kale sold also as rape? Is it B. oleracea or B. napus?

And what kind of mustard do I want to grow to make a homemade version of regular, American-style mustard? I read somewhere on the internet that it was B. hirta, but Seed to Seed says it's not B. hirta but it's B. nigra. Why is it called black mustard? Will black mustard make a light colored mustard? In any case, can anyone recommend a seed source? Any chance I can buy whole culinary mustard and use it for seed and it germinate?

Is there a way I can personally identify species differences between brassicas? In other words, are there visible difference in the flowers or seed heads, etc. I can use to confirm what species a particular brassica is?

This post was edited by cousinfloyd on Wed, Jan 15, 14 at 10:51


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RE: taxonomic confusion w/less common brassicas

  • Posted by ZachS z5 Littleton, CO (My Page) on
    Fri, Jan 24, 14 at 2:14

Russian and Siberian kale are both B. napus. It is the same species as rape/canola and also rutabagas (though they are all different ssp., or at least varieties, I'm not sure). European kale, like your curly leaved and Tuscan, is B. oleracea. There are different cultivar groups of B. oleracea such as the gongylodes (kohlrabi) and acephala (kale and collards).

Mizuna is B. rapa, that is correct. Although there is also a different species that is called mizuna, I don't think that's one your referring to. Being that turnip and mizuna are both the same species, crossing would be no problem. The only real difference is that, for example, at the root shape locus one has a gene that tells it to make a turnip root and the other does not, similar to eye color in humans (I may have a "brown" gene at the eye color locus and my wife a "blue", but we are still able create fertile offspring as we are both H. sapiens).

I think that in the Brassica genus, even interspecific crossing is readily achieved and it has ben reported that rape/rutabaga/Russian kale was created this way (likely by accident) in the way, way back days.

I can't help you with the mustard question though, I don't have a clue on that one. I guess you could always coffee filter or paper towel a few mustard seeds you buy in the spice isle?

There are definitely going to be differences between the species of Brassica. I'm not sure they are really that apparent. Most genes have no effect on the phenotypes we can actually see with the naked eye. Those that do effect the appearence of the plant are highly variable within the same species (such as our mizuna vs. turnip example). With the amount of variety in the different cultivars I don't think morphology is the easiest way to discern the different species. I could be wrong and if someone from the Botany forum wanders over here they'll probably tell you I need to revisit biology 101 haha.

This post was edited by ZachS on Fri, Jan 24, 14 at 15:37


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RE: taxonomic confusion w/less common brassicas

Zach, I just wanted to say thank you for the help.
-Eric


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RE: taxonomic confusion w/less common brassicas

This is interesting because Seed to Seed is not real thorough on some of the brassicas and she does list Siberian and all other kales as two different species. I am preparing a seed saving class and want to be able to say if broccoli rabe, tatsoi, baby bok choy, etc. will cross or not. Here in MN many brassicas are not winter hardy and not worth explaining how to save to beginners.


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RE: taxonomic confusion w/less common brassicas

Pinetree has 3 mustard seed varieties and a mustard making kit.

Here is a link that might be useful: Pinetree


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