Looks like HC to me. I have HC growing in my front yard and it grows best during cooler winter/spring months and dies off during summer/fall. Dont know why oregon wouldn't have it...im sure they sell it at yard and garden stores. And it can be grown submerged but it needs relatively high light and CO2 or it croaks. And that "star moss" is interesting. If it grows submerged let me know beacuse Ill buy IT ALLLLLLL!!!! We have "star moss' here in Cali that grows in damp areas and on trees, near water......but not in water....it melts and craps up an aquarium in a hurry.