Utricularia flowering season

Utricularia inflata was discovered when it was flowering in October 2021. The flowing is very distinctive and we had probably not ventured into that area of the lake in October before, allowing it to remain undetected. We are therefore intrigued by when it flowers on Lake Arrowhead, so we have been building a table that tracks when we have seen it flowering.

Month

U. inflata

U. radiata

U. purpurea

U. macrorrhiza

1





2





3





4





5

2022
2024



6

2023
2024



7

no
2022
2023
2024
2022
2023
2022
2023
2024

8

no2022
2023
2024
2022 2023 20242023
2024

9

no 2023 20242022
2023
2024
2022
2023
2024


10

2021, 2022
2023
2024
2023
2024
2022
2023

11





12





One theory is that U. inflata only flowers when the water temperature is below some threshold, so spring and fall.

Note: we have seen both purple and white flowers for U. purpurea in our cove August 2022, August 2024 near Beach 1, Spider Island and the culvert cove

Last update: October 2022, August 2023, September 2024