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I've recently discovered that the plant going around as Rotala verticillaris is not what it appeared to be and in fact, isn't even in the same family as Rotala (Lythraceae), which has been confirmed by a botanist specializing in those genera.
Ghazanfar had some growing emersed in a tub on his front porch that had some buds forming as the weather was getting cold. I put them into a small emersed setup I have going and they flowered, as you can see here:
Compare it to the inflorescence of Pogostemon yatabeanus:
And that of P. stellatus:
I'm pretty sure I know the species but I need (as the ones pictured have faded) to be sure of a few more things. Everything I've checked so far fits. It's interesting that the real R. verticillaris looks very much like it, apart from its sessile (right up against the stem), solitary flowers.
I have been informed that this species is now being sold as a Pogostemon in Japan.
Ghazanfar had some growing emersed in a tub on his front porch that had some buds forming as the weather was getting cold. I put them into a small emersed setup I have going and they flowered, as you can see here:

Compare it to the inflorescence of Pogostemon yatabeanus:

And that of P. stellatus:

I'm pretty sure I know the species but I need (as the ones pictured have faded) to be sure of a few more things. Everything I've checked so far fits. It's interesting that the real R. verticillaris looks very much like it, apart from its sessile (right up against the stem), solitary flowers.
I have been informed that this species is now being sold as a Pogostemon in Japan.