Myriophyllum is not a valid species
Did you mean one of the species from the following list?
Myriophyllum alpinum - 2 collection objects
Myriophyllum amphibium - 2 collection objects
Myriophyllum elatinoides - 1 collection objects
Myriophyllum integrifolium - 1 collection objects
Myriophyllum muelleri - 1 collection objects
Myriophyllum pedunculatum - 3 collection objects
Myriophyllum propinquum - 4 collection objects
Myriophyllum sp. - 1 collection objects