Yes, Tulipan is the best known. There's also Tuberosa, Tatarak, Trojad and Trybuła. A few more, but I can't think of any off hand.
Big yellow cassia flowers- Tannera
Tamaryszek(yellow not violet) sprays
Telekia (yellow)
He sent Tansy but called it vrotsez, he also had my birth flower nagietek
These are dried flat pressed flowers he has sent because I like yellow
??You could get a list of flowers and find slavized versions of mostly latin botanical names or do you want native. I think Thyme and Lindens (tillia ) grow in Poland natural
traganek ,tojesc,tojad,tatarak ,tulipan,trybula,tobolki,tasznik
