J: It's pretty small. The pot is 4-inches (10cm) in diameter, to give perspective, and the flowers are about 2 inches (5cm) across.
Goods, Calvin: thank you for the confirmation. I assumed that to be the case, but wasn't sure. The rarity that you alluded to might be why the I haven't found that much info on cucullatum.
Leafmite: thank you and best of luck with your Ang!