Found a picture close to yours when I googled small yellow burr flower. The burr buttercup was what I found. Maybe..
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It does get cold here in January and February, down to about 20 occasionally and around 30 most of the time, but we are officially into "spring" here. Our pomegranate tree survived the cold snap we had about a month ago with a blanket and some TLC. We're getting nets and cloud cover for the tropical fruit trees for next winter.
Life with animals complicated things!