Howdy Y’all. This is my first entry as I have just signed up, brought to the forum by @Dark River Aquaticsentry. As everyone in this thread I am interested in the Xyris plant and wanted to share a synopsis of my key findings.
What is known: the plant in question Xyris drummondii belongs to a grasses family and has been reported from localities ranging from Florida to East Texas (all states in between included). I have not been able to locate the type description online however, no online entry pre-dates 1993, which seems to indicate the species to be identified in late 1980’s/early 1990’s. The localities seem to be “bound” by a geographic latitude, which might be a function of ecotone and of soil type, as all are found within a certain, relative proximity to the coast of Gulf of Mexico. The plant itself is likely to be found in “patches”, where a number of conditions are met, thus making it an uncommon species. Two additional factors to it being enigmatic is probably plants’ size relative to what grows around it and the fact, that not all form the well-defined, flattened fan.
There are no reports of the plant (that I could find) found fully submersed, or even emersed (roots in water/leaves in the air, to be sure of definition) in the wild. It may have ended up in a tank as a result of lengthy and careful conversion, or it was “one of those things”, where it was found in the water by and observant and forward-thinking individual.
What is not known: Precise timing and where the plant has been intorduced to the aquarium hobby.
Is the red variety the same species, or a close cousin?
The plant is found in areas, which may/may not be boggy.
One common denominator I see is that substrate is almost always sandy.
The plant is not very happy in the tank, unless it is provided with strong light. It therefore may not be suitable for deeper tanks.
It is more than likely, that it requires a decent CO2 level in water, since it is pretty certainly a “convert”.