polyanthus
noun
poly·an·thus ˌpä-lē-ˈan(t)-thəs 
plural polyanthuses also polyanthi ˌpä-lē-ˈan-ˌthī
-ˌthē
1
: any of various hybrid primroses
2
: a narcissus (Narcissus tazetta) having small white or yellow flowers arranged in umbels and having a spreading perianth
Word History
Etymology
New Latin, from Greek polyanthos blooming, from poly- + anthos flower — more at anthology
First Known Use
1678, in the meaning defined at sense 1