Alvin, I've forgotten where was the previous post of you mentioning abt few variants in caput-medusae. Here's a pict for comparison. The one on the left is the normal caput and the right hand plant is a variant (my assumption only).
Obvious you can see the difference. The bract and flowers are the same....So, I would say it's a caput of another form.
I've attached an article abt variations in Tills. It will be very helpful for us in further understanding about these plants.
